According to the status of more and more abnormal coal mining face layout in the boundary corner seam and the geological condition complicated area，during the 53next08 fully mechanized coal mining face through the tape transport lane "S" section, a trail of mining and shortening method was conducted ，With the rational production control organized,production and shrinkage was achieved, which solved the influence of irregular surface shrinkage. The Practice showed that the fully mechanized coal mining face with the face width shortening mining，Adopts mining and shortening method, simplify the process of shrinking face, shorten the construction period, reduce material investment, and has achieved good economic benefits.The practices could provide the reference to the selection of the face width shortening mining mode for the fully mechanized coal mining face.

According to the characteristics of "benefit in post" and "defeat in front" of the parallel mining pit ditch-dumping, bridging is put forward to connect the transport channels between the end slope and inner dumping to reduce the stripping in row distance. The main parameters of the bridge are designed with the help of the geometric shape of the end wall, the moving distance of the bridge is proposed. Setting up the economic benefit equation of moving distance. Combination of Haerwusu and Heidaigou opencast mine as an example, calculated the end slope internal dumping ditch bridge optimal advancing distance is 260.7m.

The paper analyzed the reasons for the start slipping and belt floatation at the knick points of belt conveyor in main inclined shaft of Li jia lou coal mine . According to the analysis，the lower tensioning force of the hydraulic automatic tensioning device and the lower curvature radius of the concave arc of conveyer belt were the root cause of the start slipping and belt floatation of belt conveyor. Based on the theoretical analysis and test results，some improving measures were put farward，such as changing soft-starting time of belt conveyor，increasing the tension of the hydraulic automatic tensioning device and using press belt transshipment device at the knick points. The belt conveyor ran safely and reliably. It provided valuable practical experience for other mines to solve the similar problems.

Aiming at achieving the requirement of remote monitoring system of coal mine washery large equipments in ShanXi, a set of system is designed by using wireless and wired communication, besides, the upper computer software is designed based on LabVIEW. The field application has shown that the designed system is stable and reliable, which achieves the remote monitoring system reducing the labor intensity, and it has improved the information management and automation level in coal mine.

Sheng Yuan freight station is not only a key part of the coal distribution links, but also the road concentration and rail transport of the intermediate links. Civil structure is the carrier of the various transport links in the system. in addition is a prerequisite for the operation of various equipment. Because the project is located in the valley backfill area, backfill thickness is more than 20m, not suitable for building constructions. in order to ensure the progress of the project, we decide to use Cast-in-place pile which Penetrate the backfill area. In order to determine the calculation of the end bearing friction pile and the rock socketed pile which is more suitable for the actual conditions. Calculating and Analyzing the trestle legs bearing capacity difference between two calculation models. Through theoretical analysis combined with static pressure test data. It is concluded that the end bearing friction pile is more suitable for the actual working condition of the project.

There are three assembling ways for fabricated steel tube truss and support in field splicing: namely, flange splice joint, sleeve splice joint and plate splice joint. Study on the design of these three joints is the key for fabricated structure. The connection design of lateral force resisting element(LFRE) for these three assembling ways is carried out based on the calculated result by “Spas+PMSAP” integrated design module. From the calculation, it can be seen that all these three splice joints could satisfy the design requirement when proper gusset plate, welding seam and bolt connections are being chosen. Through analyzing the calculated result, all these three splice joints could satisfy the requirement for fabricated steel tube truss and support during field splicing.

Shenfu Dongsheng coalfield which is mined by Shendong Mining Area is shallow and deep coal seam occurrence and the mines are mostly developed by adit or inclined shaft. Drilling is often needed in the production process in coalmine. Because the functions of the drills are different, the hole size and depth are also quite different, the corresponding selection of drilling equipment and construction technology also has its own characteristics. Systematic analysis and research on the characteristics and construction technology of underground coal mine in Shendong mining area is studied . It has great significance for the optimal selection of construction equipment and all kinds of drilling process is suitable.In this paper introduces the characteristics and construction technology of drilling used in Shendong mining area.

Deformation control issue of surrounding rocks of deep and soft rock roadway has been the focus and difficulty at coal mines studies. Take the track-down roadway of district D four in Pingdingshan No.8 Coal Mine as engineering background, use in-situ industrial test and numerical simulation，the paper studied the mechanism of surrounding rocks deformation and failure of roadway in two kinds of support conditions with bolt-shotcreting and bolt-grouting support. The results showed that: (1) Compared with the bolt-shotcreting, higher stress zone into shallow surrounding rock of bolt-grouting roadway is shifted to deep surrounding rocks of roadway, so that the shallow surrounding rocks area is in lower stress zone, which improves the surrounding rock stress of roadway. (2) The displacement of roadway surrounding rocks with bolt-grouting is less than that of corresponding positions of roadway surrounding rocks with bolt-shotcreting, So bolt-grouting support plays an effective role in control strata deformation of roof and floor and two sides of roadway. The authors proposed and implemented the measures of secondary grouting technology of roadway, studied grouting process and grouting parameters. After the implementation of field test, roadway deformation has been effectively controlled.

To solve the intense first weighting interval of ChaHasu mine fully-mechanized coal face, eliminate hidden danger, The application of deep hole presplitting blasting technology in 31307 full mechanized coal face by theoretical calculation, field test method. Through the analysis of ground pressure, results show that the first weighting interval of roof is 41.2m, the face’s roof weighting step and weighting strength decreased significantly Compared with the previous two working face. Less influence on hydraulic support and avoid the goaf hurricane risk factors and has ensure the safe production of the working face. It provides a good reference for forced roof caving under similar conditions of Xinjie mining area.

In order to ensure underground coal mine safety production, the paper provides a technical method of directional borehole of grouting reinforcement in seam floor with directional drilling technology. A systematic analysis and research was conducted on the casing drilling, directional drilling and grouting technology. The test results in Sangshuping coal mine showed that the directional drilling could realize advance exploration and advance treatment of seam floor and increase the effective section of borehole in the aquifer, meanwhile the coordinates of water point was accurately calculated. It could ensure gateways of No.11 mine in Sangshuping coal mine safety.

Aiming at the characteristics of technological process in heading and mining face，analysis of occupational hazard in heading and mining face, propose protective measures，providing reference foe the design of occupational protective facilities ，control occupational hazard of the workers in heading and mining face in coal mine。

Coal-based hydraulic fracturing AR weakening the principles and roof fracture instability theory, physical simulation experiment study of hydraulic fracturing of coal seam roof rupture affect instability. Test showed that: after seam hydraulic fracturing, stepped roof overhang directly exposed length is shorter than when no seam hydraulic fracturing, fracturing the immediate roof is more broken, no strong roof pressure; after fracturing, in advance periodically breaking the old roof instability, shorten the main roof breaking stride, weakening the hard roof to alleviate rock burst, overlying rock broken sink gradually expanding the scope and the vertical hydraulic fracture crack tip is elliptical parabolic boundary; after fracturing, support load overall decrease, resulting in greater pressure on the roof to crack when excessive pressure, joint action by its holder pressure increase briefly, hydraulic fracture extension extended to rock, rock formation to the seam between Loaded Save small. The similar simulation test has an important reference value for the coal mine hydraulic fracturing weakening of the top plate main surface coal mining and management, to provide protection for coal mine production safety.

This paper analyzes the importance of mine disaster, serious losses caused by focusing the cataclysm period to clear underground ventilation, with emphasis on innovative thinking of building ventilation system during mine disaster, help the staff to establish the correct meaning of the knowledge of mine ventilation design, ventilation automatic control system combined with network technology, automation technology and information technology of diversification of science and technology, hope to be able to create mine ventilation automation control system to adapt to the development of modern society, and ultimately reduce personnel mine disaster damage, improve mine safety goals.

Based on the special mining conditions of 9 coal under Double threat of the extremely thick igneous rock and ordovician limestone water，the water inrush mechanism of coal seam floor is analyzed under extremely thick igneous rock according to hydrogeological condition theoretically；study on the different roof control and ordovician limestone water press to the influence of coal floor stress distribution and deformation by numerical simulation.The results show that filling mining and forced caving than hydrophobic step-down to reduce disturbance and destruction of coal floor effect is remarkable under the condition of extremely thick igneous rock roof，and then put forward to filling or forced caving mining technology is given priority to with hydrophobic step-down technology of water proofing. By 2911 working face mining practice shows that this scheme could effectively reduce the water inrush risk.

In order to improve anti-corrosion and lubricity performances of the traditional high-water content hydraulic fluid , this paper adopted refined base oil, high-effective surfactants, anti-rust agent,developed a new microemulsion of hydraulic support with high stability, excellent cleanliness. The main performance indexes of the microemulsion meet the requirements of MT76-2011, and its diluent was homogeneous and transparent liquid. Applied in hydraulic support system of Talahao coal mine 2102 workface, results showed that the new microemulsion with excellent stability, rust resistance, compatibility and lubrication, no odor, bacteria ,irritation and other undesirable phenomena, can fully guarantee smooth operation of the support system.

In this paper, application of PLC control system in semi-dry flue gas desulfurization project of the boiler plant in the second mine of Cuncaota, ShenDong was introduced. The process principle of semi-dry flue gas desulfurization was overviewed, the selection and components of the PLC control system, as well as the reliability design of power supply and ground connection were illustrated. The control system was divided into three sections, which were DAS (Data Acquisition System), MCS (Modulating Control System) and SCS (Sequence Control System) according to the functions, at the same time, the control object and principle of each section were discussed in detail. PID control principle was also applied in MCS to realize close-loop control.

Aiming at finding out the movement behavior of overlying strata in working face with large dip angle and large mining height under the roof of interbedded coal gangue,taking the 25213 working face of Xinjiang coking coal group as the engineering background,using the method of physical analogous simulation,made a research about the movement behavior of overlying strata in working face with large dip angle and large mining height under the roof of interbedded coal gangue.The result indicated that:(1)The pressure step distance excursion is 8~17m about 25213 working face.Compare with the same dip working face with large dip angle and large mining height under the tight roof,the pressure step distance excursion is larger,and the magnitude of shock load caused by overlying strata breaking is larger.The abutment pressure in working face is larger and it has a stable distribution.The peak values of abutment pressure in upper coal pillar and lower coal pillar are smaller.(2)In the seam height,compare with the overlying strata in upper region,the overlying strata movement in lower region is lager.In the seam inclined direction,compare with lower region in this working face,the overlying strata movement in middle region and upper region is lager.

In order to investigate the crushing station selection of Semi-continuous mining technology in China's typical open pit mine and Improve the accuracy and practicability of the selection model. Based on the statistically study of geologic conditions and mining conditions, analyzed the factors which affecting the selection of crushing station ,the characteristic indexes of crushing station selection are established. The entropy weight method and analytic hierarchy process (AHP) were used to establish the optimal selection of crushing station. So as to provide reference for the selection of crushing station in open-pit coal mine.

In order to analysis the fault activation mechanism of coal mining Stope floor, in this paper, considering mine-induced stress and groundwater pressure it have, we use theoretical analysis, numerical simulation, laboratory testing and other methods to do analysis in Sima coal mine field. The expression formulas of failure depth of complete floor and the floor of the fault during coal mining is deduced. The influence of the stress change on the permeability of fault during the process of coal mining is studied by using the permeability test of fault zone filling and the FLAC numerical simulation software. And through the field test, fault connectivity test, it prove that the barrier water capacity of the fault zone of the Sima mine is weak.

Experimental study on rock interface sliding using double shear model of granite. Acoustic emission system is used as a data acquisition method for viscous sliding process of rock interface. Characteristics of acoustic emission in the process of fault slip. The acoustic emission, ringing counts, acoustic emission energy, acoustic emission frequency and AE event rate are analyzed. According to the analysis results:(1)During the experiment, the amount of load reduction corresponding to the rock interface sliding increases gradually, the interface sliding time corresponds to the acoustic emission, the ringing count increases sharply, and the increment value of the excitation decreases gradually.(2)For the first time, the acoustic emission energy is minimum at the interface sliding. As the loading goes on, the interface slip at the rock interface occurs at the moment, and the acoustic emission energy increases gradually as a whole. (3)When the rock interface slides for the first time, the acoustic emission events in each frequency range are smaller, and the events are less obvious at the sliding time.(4)Before the rock interface slides, the load increases slowly, and the AE event rate begins to decrease. At this moment, it can be used as precursor information of fault slip.

Water injection is an effective measure to reduce the rock burst tendency and risk level in coal mines. Laboratory field research shows that the consistent coefficient and uniaxial compressive strength of coal sample decreased with increasing time after the immersion test. And the drilling cuttings weight and electromagnetic radiation strength of coal seam with water injection decreased significantly on site. For judging the infusibility of coal seam infusion, six influencing factors including cranny viability, porosity, wet rim angle, firm coefficient, saturation moisture increment and buried depth were selected as evaluation indexes, and four discriminant functions were obtained through training 15 studying samples from different mining areas coal mines and the ratio of mistake-distinguish was zero after the distance discriminant analysis (DDA) model was trained. Coal sample seam of Dongrong 2 coal mine from a coal mine was used to verify this model. The results show that the DDA model is an effective method to judge the infusibility of coal seam infusion.

F5 thrust a coal mine based on the actual geological data, by using numerical simulation software FLAC3D, the upper and lower two sets of F5 thrust face stope stress evolution rule of the fault zone and in turn fault activation law study, reveals the fault fracture zone in the process of working face mining width and the relationship between the reverse fault activation. Research shows that because the fault fracture zone has the larger deformation buffering capacity and the secondary stress generated by the absorption of mining, makes it hard for stress transfer across the fault fracture zone to more forward propagation, surrounding rock stress peak area is limited in the working face of coal wall and fault fracture zone on one side of the damage zone boundary between coal pillar, so the footwall mining working face, the working face advance to 210 m location, fault zone of the normal stress appears to slow down, slightly elevated phenomenon; Two sets of coal seam mining, the normal stress of fault zones, the two sets slippage and pore pressure of surrounding rock is proportional to the width of fracture zone, namely, the greater the fault fracture zone width in mining under the influence of the activation, so in practice need to be targeted prevention and control measures.

Abstract: The study on analysis of source of CO in the upper corner on the working face of Xichuan coal mine was carried out through field experiments and laboratory demonstration methods in terms of frequent occurrence of CO in the upper corner with concentration exceeding the standard requirements in the coal mining process of working surface of Xichuan coal mine, which determined that the main source of CO in the upper corner of 1113 working surface of Xihcuan coal mine is the low temperature oxidation of residual coal in goaf, followed by low-temperature oxidation of coal body on the working surface, and high-temperature oxidation of coal body of coal wall in the cutting process of coal mining machine and CO generated due to rupture of covalent bond of coal molecular. The release of CO of original occurrence in the coal seam can be eliminated.

In view of the shendong mining area of water conservation mining technical problems, in the system analysis part to solve water problems filling mining based on the theoretical analysis, laboratory test and numerical simulation methods of filling process, This paper puts forward the research ideas and methods to solve the problem of water conservation mining with green partial filling mining .The main conclusions are as follows: (1) part of the filling of water conservation mining mechanism、analyzes the technical characteristics、the filling process; (2) derived partial backfill method, meet the water resisting key layer does not break the relationship; (3) according to the layer theory and the effective area of water resisting key theory derived mining and stay wide; (4) the numerical simulation results show that partial filling parameter selection of height of water flowing fractured zone has important effect. Study in Shendong mining area were carried out on-site implementation, related research has certain reference significance and application value to the similar conditions of coal mining water.

To address some practical engineering issues such as unmanned coal mining and automatic lifing of shearer drum, a coal-rock recognition method based on the wavelet packet singular value(WPSV) and BP-neural networks(BPNN) is proposed. The new method uses wavelet packet singular value to build a feature vector and combines it with BP-neural networks for the coal-rock recognition. First of all, the torque signal of shearer drum cutting coal is collected by sensors, and using wavelet packet to decompose the torque signal of shearer drum, obtain the wavelet packet decomposition coefficient and form the wavelet packet decomposition coefficient reconstruction signal matrix; Then, Obtaining the major WPSV and forming feature vector by using singular value decomposition(SVD) to the coefficient matrix; Finally, Inputing the feature vector into the BPNN classifer to identify the coal-rock interface automatically, and the results were compared with the ones by traditional method. Experimental results demonstrate that this new method has the higher accuracy, which can represent the working state of shearer drum effectively.

The addition of frother is a crucial method to adjust the foam properties. To research the foam decay process of cetyltrimethyl ammonium bromide(CTAB), the foaming rate, foam volume, content of liquid and drainage rate were tested using FoamScan, and relationship between the surface tension and the foam properties were analyzed. The results showed that the critical micelle concentration (CMC) of CTAB was 0.90mmol/L. The foaming rate initially increased with an increasein solution concentration, then reached to be a maximum value which is 0.09 mL?(mL?s)-1 at CMC. Interestingly, the trend of foaming time versus concentration was opposite to the foaming rate versus concentration, and the minimum foaming time was 38s. At low concentrations, the foam stability increased with increasing CTAB concentration and reached the most stable stage at CMC, but appeared a little decrease when solution concentration exceeded the CMC.Frothers adjust the stability of foam by affecting the foam decay process, especially the foaming and decay processes would be unchanged when solution concentration reaches to CMC.

Coal gangue is a kind of solid waste with enormous emissions. And the main composition is silicon, aluminum and iron. Leaching behavior differences of aluminum, iron and silicon components from coal gangue in Gujiao Dongqu Mining Area were studied using sulfuric acid as leaching agent. The results showed that the leaching differences between aluminum, iron and silicon components in coal gangue were very obvious. Under the optimal conditions of sulfuric concentration of 7.5mol/L, liquid-to-solid ratio of 4:1、120℃for 150min，the leaching ratios of TFe, Al2O3 and SiO2 are 98.31%、97.19% and 15.88% respectively. And Leaching rate difference between TFe and SiO2、Al2O3 and SiO2 are 82.43%、81.31% respectively. Obviously, the sulfuric leaching can realize clean separation between TFe, Al2O3 and SiO2 in coal gangue. TFe, Al2O3 component was concentered in the leachate, SiO2 component was enriched in the leaching residue. The Al and Fe element content in eventual leachate were 10.2 g/L and 3.4 g/L respectively and the pH<3. The leaching residue with SiO2 content as high as 90.22% was received synchronously

As the coal material for underground pyrolysis and gasification is the primitive coalbed of hundreds even thousands meters below, the ground catalytic approach is hardly used for underground catalytic pyrolysis or gasification. This thesis illustrates the special design for the underground catalytic pyrolysis solution that takes catalytic pyrolysis test on the anthracite from Changji, Xinjiang with Ca(OH)2 catalyst in the horizontal pyrolysis reactor, and obtains chars of before and after catalytic processing, and tests the specific area, XRD and char gasification reactivity of the char. The test results indicates that Ca(OH)2 activates char pyrolysis, increases specific area rapidly and varies the pore size distribution. Moreover, the catalyst speeds the thermal cracking of organic functional groups in the coal, blocks retrogressive reaction of aromatic free radical, suspends order reaction and graphitization of char pyrolysis, and enhances reactivity of the coal char.

Coal slime increased year by year with mechanized mining in recent years. The technology can not deal with large numbers thermal coal. Large numbers of thermal just pile up. Thermal of Yulin can be separated by using 80% KD-4 /20% aids N and 2-Octanol as Foaming agent N. The flotation concentrate successfully improve concentrate of coal-water slurry from 60.5% to 65.31%. It achieve the most utilization of resources.

Due to excessive CO, impacting the coal mine spontaneous combustion forecast index system..Taking Lin Nancang as an example ,From two aspects of the microstructure of coal and the external environment condition of CO to study the seepage law. Due to the low degree of metamorphism of coal, the structure of the big holes develop rich, and contains a large number of oxygen containing functional groups and free radicals, The permeability of CO in coal seams is much less than that of gas under different conditions, With the gas pressure change trend in general, and more sensitive to the temperature. When the external pressure is relatively small, the CO permeability decreases with the increase of temperature, and with the increase of confining pressure, the effect of CO permeability gradually weakened..When the confining pressure is greater than 3.0MPa, the pores in the low rank coal are severely damaged, the large pore structure disappears, and the CO permeability decreases, which is almost not affected by the change of the external conditions, Finally, the influence factors of CO permeability in coal seam are analyzed by using principal component analysis method and SPSS software, finally,getting two main influence factors, the porosity and confined pressure.

Abstract:In order to obtain different face air when the air leakage in the working face and gas concentration distribution law in goaf and provide the theoretical support for gas control of face. The distribution characteristics of air leakage and gas concentration in the goaf of Wangzhuang 8103 working face under the conditions of 2198 m3/min, 2350 m3/min, 250 m3/min and 2650 m3/min were simulated by Fluent numerical simulation method. The distribution of air leakage along the working face and the gas distribution in the goaf.The results show that: with the work supply volume increased, the amount of air leakage working face to goaf increased gradually; goaf gas concentration decreased gradually; upper corner gas concentration decreased gradually, and when increasing the air quantity of working face to 2350 m3/min , upper corner gas concentration is reduced to below 1%.

Aiming at the shortcomings of the traditional coal mine explosion-proof frequency converter, the design scheme of the three-level mine combined explosion-proof frequency converter is put forward. The structure design of the main circuit and the control algorithm of the three-level inverter are discussed in detail. Matlab/Simulink simulates the proposed two-inverter combined three-level inverter. The simulation results show that the voltage waveform is close to the sine wave and the total harmonic distortion (THD) of the waveform is low. The proposed three-level combined modular explosion-proof inverter the advantages of a detailed analysis, through the test to verify the correctness of the design.

The coal mechanical sampling system has problems of strong vibration and much leak coal when the sampler works. The primary cause of the impact force has been discussed. For reducing the impact force, the design of new type sampler with low impact has been done. The cooperation of platform’s responses under sampling impacting with new sampler and old sampler has been done via FEM(finite element methods). The result shows that the impact to the platform and the channel steel has been reduced greatly. The sampling impact has been transferred to internal force. The maximum deformation of supporting channel steels has decreased from 2.18mm to 0.85mm, and the maximum stress has decreased from 189.87MPa to 68.51MPa. They has decreased 61.0% and 63.9% separately. The impact force caused by sampling of sampler has been decreased strongly via the using of the new type sampler with low impact.

For a long time, concave drill bit was mainly used in coal mine, but with the deepening of coal mining depth, more and more complex formation was encountered while underground drilling. When drilling hard rock (which hardness coefficient is greater than 8) by using ordinary three-wing concave drill, the drilling efficiency is low, the bit life is short and the drilling cost is high, so in order to solve the problem, the arc angle PDC bit was developed. By introducing the design theory of oil bit, the bit profile shape and cutter arrangement of arc angle PDC bit were optimized, also the cutters with chamfering were used. Drilling experiment was carried out in the colliery, comparing with the ordinary concave drill, the drill efficiency increased about 1.6 times, and the average bit life increased 2.8 times.

In order to improve the service life of the side panel of a linear vibrating screen, a method based on topology optimization and improving the position of the stiffener of the side plate is proposed in this paper.It can improve the operation of the side panel problems, such as side panel cracks and other failures.In this paper, the side of ZKB1548 linear vibrating screen is taken as an example. ANSYS software is used to analyze and study. It is known that the change of the position of the stiffener of the side plate will affect its natural frequency.The side plate is optimized, and the working frequency of the optimized side plate has a certain safety distance with the natural frequency of the structure so as to guarantee the service life of the side plate.

On the basis of the design of the three-DOF parallel hydraulic support, the Workbench software is used to establish the finite element analysis model of the parallel support mechanism. Based on the optimization analysis of the parameters of the column inclination and the position of the seat, the parameters of the hydraulic support are obtained. Through the analysis of the optimized parallel support mechanism, the hydraulic support in the X, Y, Z direction has a good ability to make pressure unloading. The results show that the three-DOF parallel hydraulic support technology can overcome the defects of the existing hydraulic load, can withstand different directions including lateral force, can improve the stability of hydraulic support and adaptability to the surrounding rock.

This study analyzes the cointegration relationship of low carbon technology innovation and financial support from three aspects： the government, enterprises and financial institutions based on the shanxi coal industry, according to the promoting mechanism and existing problems. The conclusions of this paper are as follows：Government funds, enterprise funds in the coal based industry’s scientific and technological innovation in the development and industrialization stage has played a positive role in stimulating；Financial institutions loans has played a positive role in ?achievement transformation stage. Diversified multi-level innovation investment system should be established as soon as possible ,with fiscal funds as the guide, corporate investment as the main body, financial institutions loans to support, venture capital as the important development direction and preferential policies to support.