Abstract: For fault fracture zone in the rock fissures and large section roadway through high fault fracture zone, the traditional crossing fault technology is difficult to guarantee the stability of the roadway and pedestrian safety and transportation issues. According to Pansan coal mine central mining waste rock belt machine transportation roadway in group C coal experienced up to 20~60m large thrust of the engineering geological condition, formulated the following plan to solve the above problem, first the fault fracture zone were pre-grouting, then used the hollow grouting anchor (cable) advance strengthening roof rock, implemented shed shoring, finally surrounding rock of roadway used secondary grouting reinforcement. Engineering practice shows that mining waste rock belt machine transportation roadway crossed fault fracture zone safely by using "pre-grouting - Advance Support - Shed - secondary grouting" whole section once through the fault fracture zone of the support technology, and roadway surrounding rock has been effective controlled.

Dragline rational operation mode was studied to improve the efficiency and reduce the cost. Dentified dragline excavation radius into end-slope leveling radius, minimum excavation radius and maximum rational excavation radius seperately. Based on 8750-65 dragline parameters and on-site operation conditions, paper deduced dragline’s kinds of operation mode including initial state, reverse shifting, unidirectional advancing, round trip advancing, etc., concludes the relations of working bench height, shifting distance, shifting steps and advancing distance, recommends 8750-65 dragline apply roundtrip advacing mode. The conclusion provides accordance to the formation of standard dragline operation mode and is of great help to guide the design and improvement of blasting, striping and mining, providing detailed analysis method and theoretical accordance.

Aiming at the problem of coal pillar size in fully mechanized coal caving face, A combination study method of theoretical analysis and numerical simulation is adopted for studying the distribution of plastic zone of the surrounding rock of 4220 pairs of roadway under different coal pillar size. Combined with the actual situation of the scene, the reasonable coal pillar size is 10m. Finally, the reasonable coal pillar size was tested in the field, test results show, in addition to the deformation of roadway excavation roadway along the roadway excavation at the early stage is large, rib sides convergence was controlled within 250mm, convergence between roof and floor was controlled within 100mm, this shows that the size of the 10m coal pillar is conducive to the maintenance of the 4220 pairs of lanes, it can satisfy the requirement of normal transportation of roadway. The results can provide a reference for segment pillar setting in other mining area of Chengzhuang coal mine with similar mining conditions.

Abstract: Pingdingshan mining area after the founding of New China, China's own planning and construction of the first large coal base. After 50 years of development, mine production capacity to gradually improve, mining activities have been deep into the region. Continue extending mine mining area and the old mine technological potential, increase productivity process optimization Ida border, the active use "sub-regional development, focused on the coal" construction mode, simplifying the roadway to open up the system, saving the mine investment, a significant improve mine (area) yield, with good sense similar demonstration mine development.

To analyze the reliability of the special hydraulic support for coal mining high concentration cementation stowing, based on the brief introduction about backfilling technology and technique of coal mining high concentration cementation stowing ,the special hydraulic support for coal mining high concentration cementation stowing (ZCL7200/16/26 hydraulic support for coal mining) is developed. Solidworks Three-dimension model is adopted to build parametric model of coal mining hydraulic support. Finite element analysis is applied to analyze stress and deformation distribution date of key component under simulation loading and unbalance loading working and to investigate the support overall structural stability and strength .Research indicates: The finite element analysis displays that the special hydraulic support meets the requirements of filling mining use in design range on support integrity and stability; This support shows good integrity, high strength, high reliability and fast advancing supporting speed in field practice; beam back filling consolidation can pull out smoothly; besides it adapts the height of support and filling body well; stress and deformation monitoring parameters of top beam and upright in trial meet the general technical requirements of hydraulic support . The above shows the support achieves good technical and economic deficiencies.

Abstract According to Zhu Ji Xi coal mine deep shaft equipment design practice, puts forward the method, calculation of FRP composite guide selection, at the same time, discusses solution for guide selection under heavy load, to offer a reference for similar design.

Aiming at the problems of low degree of automation, high energy consumption and poor emergency response capacity in coal mine drainage process, this paper took the control system of S7-300 and its extended components as the basis points, a kind of automation drainage system based on the control strategy of safety and energy saving was proposed. The principle of automatic monitoring system is described in detail, by using the microprocessor to calculate the pump maximum discharge, the rate of change of the water, water storage volume, power load information and analog signal, and the automatic rotation and drainage of the pump is realized by using the theory of multi parameter fuzzy control. With the use of the case, the system has the advantages of safe, reliable, energy saving and high efficiency.

Abstract: TBS, as one of the main equipment Slime Separation in High Slush coal sorting, there is its own insurmountable problems, combined with Liangbei coal cleaning plant coarse slime separation process, a detailed analysis of the cause TBS sorting the main reason for the poor results, and made a large diameter cyclone classifier used in conjunction with TBS, which can effectively improve the material conditions TBS, thereby reducing the ash concentrate TBS, TBS's efficient sorting.

The inner force of silo wall subjected to stored material pressure and temperature action is analyzed based on the moment theory of cylindrical shells, and the results are compared with the finite element method in the paper. The results reveal that inner force analysis of silo wall using the moment theory or the finite element analysis are more close to practice than traditional no moment theory for large diameter silo.

Abstract: South wing of Gu Bei coal mine (11-2) through the seam to return airway abnormalities F104 fault Zone Roadway engineering background, introduce the development of rock fractures in the fault zone, the local water rich, the deformation of rock deformation and the characteristics of the high degree of mud, on the foundation of the pre reinforcement and excavation of the effective support, the full use of the surrounding rock and the capacity of the surrounding rock, using comprehensive research method of theoretical analysis, numerical simulation and field test, system research Tunnel safe driving and reinforcement technology of Gu Bei coal mine in the F104 abnormal tectonic fault zone, results show that no cracks and separation phenomenon of new the surrounding rock after grouting fractured surrounding rock filling，passed Fault Zone smoothly, made a successful industrial test.

Comparing with traditional mining technology of remaining coal pillars, gob-side entry retaining technology could improve the recovery coefficient of coal resources and reduce the tunneling amount of roadway.12-307 working face of Shangwan Coal Mine is the first gob-side entry retaining working face in thick coal seam in Shendong mining area. We ensure the safety erection and perfusion of the flexible template by assurance the engineering quality and suspending iron net before the hydraulic support and erecting wood point pillar after the hydraulic support. Engineering practice shows that the flexible template gob-side entry retaining technology’s system is simple and its construction speed is fast and its roadway retained effect is good. The working face of 279.1m using gob-side entry retaining technology could promote 9.0m everyday and it has good economic benefit and application prospect.

Through the analysis of the occurrence mechanism of rock burst in the southern area at Wudong coal mine with steep and extra-thick coal seam, combined with the special geological conditions for coal seam, the mechanism of rock burst in the area is analysed and verified, then the unloading measures of rockburst prevention in coal and rock mass are put forward as this basis, the effect of control measure is evaluated at last. The results show that:Rock burst is formed at the action of rock pillar leveraging,crustal stress and the lithology of coal and rock, the clearance way of "main is unloading for the rock mass, minor is for coal mass" is put forward. The measures release the accumulated elastic energy in rock mass, which also reduces the brittleness and capacity of accumulation high energyfor the coal, achieving the aim of reducing the harm of coal and rock burst.

In order to improve the gas drainage quantity from low permeability high outburst seam and to reach the outburst elimination target with gas drainage, Put forward the technology of hydraulic fracturing . Include using hydraulic equipment of large flow and high pressure, improving technology of fracturing drilling hole sealing and raising technology of hydraulic fracturing and permeability improved. The process of fracturing injection pressure is designed to process of promotion. The experiment investigation was conducted with application results of hydraulic pressurized cracking technology was analyzed. The test results show that the fracturing effect radius can reach 60m after implementation of hydraulic fracturing, when using the same pumping power equipment, unit of gas extraction of pure quantity increased average of 2.2 times compared with the original,. increased average of 1.3 times compared with constant fracturing The coal seam permeability coefficient increased by 6 times, completing the purposes of improving the gas extraction efficiency and rapid outburst elimination .

According to the status of high dust concentration and serious pollution in the fully mechanized working face,it puts forward efficient foam dust control technique. It’s a detailed analysis of the foam dust control mechanism and the efficiency of dust control.According to the production conditions and process ,it designs the working parameters and fixed ways of each component of the foam dust removal system in the fully mechanized working face. By different wetting agent added ratio of flour dust concentration test, the total dust reduction efficiency of dust reaches 91.4~94.2%, it significantly reduces the dust concentration in the working face.

For the problem of surface blasting will effect the stability of roadway surrounding rock in open-pit and underground mining, here using blasting micro test system to real-time monitoring the nearest roadways from explosion source, and by means of multivariate nonlinear regression analysis of the monitoring data, obtaining the parameter K and α in Saudorsky formula, determining the open-pit blasting single response explosive amount and the safety distance between roadway and explosion source of the mine test. The roadway bolt stress measured results shows that the selection of open-pit blasting parameters and safety distance can ensure the safe use of roadway.

In order to solve the problem of large weighting step, strong ground pressure behavior and hard to management with the hard roof. Serving the mine of ka wa zhang as the engineering background. After calculating the roof’s fall across interval in theoretical, proposing roof weakening scheme of cut blasting and ahead of pre-splitting blasting in the roadway. Measuring the strata pressure data in the scene and analysing the condition of strata pressure. The results show that: the hard roof has strong integrity and good mechanical properties, besides its initial and periodic weighting interval are large. Through taking the technology of forced caving of blasting , the hard roof’s compressive strength has been reduced and it ensure the mine to have a safe and efficient production.

To determine the effective gas extraction radius of the dill hole along coal seam reasonably, based on Darcy’s law, Fick’s law of diffusion, as well as gas flow method in the coal, gas flow equation was established, different determination methods were analyzed according to different gas extraction evaluation index, extraction rate was adopted to calculate the effective radius on the basis of Jingfu mine field gas attenuation coefficient, the results show that the effective radius increases to the limit of 1.4m gradually ,and the process slows down with time going on, at the time of 86ds the radius become 1.33m.

Abstract:This paper introduces the technological process and technical characteristics of GSP gasification technology, and emphatically analyzes the problems in industrial application of GSP gasification technology, such as pulverized coal conveying unsteadily, igniter burner blow-off and burning through, cold wall burning loss and synthesis gas carrying ash. Finally summaries the exploration and improvement measures to the above GSP gasification technology problems of Shenhua Ningxia Coal Group.

The occurrence of the mine geological hazards is directly determined by the Characteristics of fault structures and other geological conditions which are also the main factors induced dynamic disasters and accidents in coal mine. By using the physical simulation method, we studied the distribution characteristics of stress field in the coal mining under the condition of two fault coupling. It was indicated from the simulation results that the advancement of the mining face led to the first fault attachment stress increase amplitude is greater than the second fault before the fault slip. The reason is that the advancement of the mining face makes most of overburden pressure apply on the first fault while the stress and strain energy are accumulated in the overlying rock. After fault slip, the first fault slips instability firstly under the dynamic pressure due to the advancement of the mining face. In this situation, therefore, most of the accumulated strain energy releases and stress variation in the first fault is relatively greater than that in the seconder faults. Based on the above results, it can be seen with the respect of unstable release of stain energy that the dynamic disaster could be induced in high probability during the mining face pass through the first fault under the effectiveness of multi-faults coupling.

Abstract: Combined with the geomorphology、daily mining distance and observation of ground crack of 8101 working face in 1# Selian mine, the paper deduces the distribution law of cracks both in gully and plain area. There are two existence forms of cracks: one is temporary along working face; another is permanent along working face roadways. The ground cracks in plain are much wider and deeper than those in gully area. The surface movement advance crack angle is calculated based on the cracks statistical parameters. Measuring crack development in different landforms, the paper reveals “crack generation-crack extension-sidestepped subsidence-crack closure” dynamic evolution rule. Aimed at geomorphic features in this mining area, the paper also proposes many control measures such as strengthening the observation of cracks evolution and cracks landfill compaction.

Abstract： In order to research the damage rule of mining floor with a coal mining, this paper make a analysis about the damage depth of mining floor by respectively using test method of the bottom of water injection test, rock strain detection and theoretical analysis. Basing on the test site, it is found that the first mining failure appears in the mining floor when the floor pushes to the measuring point and the damage depth is about 18.5m. The damage depth of floor strata deepens to 18.5m to 19.5m when the floor pushing over the measuring point is about 15m~20m. Elastic theory calculated that maximum damage depth of mining floor is related with the seam depth H, the stress concentration factor n, the uniaxial tensile strength of rock Rt. The maximum damage depth of mining floor increases with the seam depth and the support pressure increases, and decreases with the uniaxial tensile strength of rock decreases. The damage depth of mining floor in water injection test, rock strain detection and theoretical calculation is both about 19.5m on the test site in F6106 working face. The three methods can accurately predict the damage rule of mining floor in BuLianGou coal mine no. 6 coal seam floor.

In order to improve the source location precision of mine microseismic monitoring system, considering the actual situation of the mine, high precision microseismic monitoring system in coal mine is developed. The substations of the system are laid in the mining area floor, collecting vibration wave signal. And then the substations transmit microseismic data to the center by the network. In order to guarantee the time accuracy of microseismic data of the substations, PTP precision clock synchronization protocol can be achieved. To improve the reliability and stability of the system clock, the RTC(Real Time Clock) was designed as a complement to the PTP clock. Based on the characteristics analysis of the vibration wave threshold value, the window of time and triggering number, microseismic wave is identified automatically. The center measuring and controlling computer manages every substation by remote control，monitoring working condition of every substation.The system is based on the statistical analysis of every coal mine microseismic events in time, numbers, location, magnitude, the future seismic trend prediction. The operation of this system shows that the monitoring results are fully identical with the actual situation; and the results have high accuracy positioning.

Due to overrun of carbon monoxide in the coal seam, this is seriously interfere with the work of prediction to coal seam spontaneous combustion, based on the theory of gas-solid coupling theory, it has been conducted from the microscopic structure and macroscopic factors two aspects to research permeability rule comprehensive coupling of carbon monoxide in coal seam. Research findings, coal seam of exceeding carbon monoxide concentration have low metamorphic degree, and have rich side chain and the oxygen containing functional groups, contains a lot of closed holes and semi-closed air hole, the carbon monoxide in coal seam permeability is far less than the gas permeability at the same time, create the conditions for carbon monoxide accumulation in the coal seam; the relationship between carbon monoxide permeability and gas pressure present in the form of index decreases, and this is generally in accordance with gas permeability rule in coal seam; in addition, temperature had a greater influence on the carbon monoxide seepage in the coal seam, with the increase of temperature the carbon monoxide permeability decrease but there are obvious accumulation phenomenon, this is similar to the permeability rule of gas and provide certain theoretical basis to research on the carbon monoxide transfinite phenomenon in coal seam.

Based on the Mohr-Coulomb yield criterion and the Formula of water inrush coefficient, we obtain a new method to evaluate and predict water-inrush from coal seam floor. And use it to predict water-inrush of some important point of the Xianfeng mine in Yunnan Province. Then compared with the result of the Formula of water inrush coefficient, find that some areas non-water inrush with the result of the Formula of water inrush coefficient, but it is possible to water inrush with the new method of this paper. On the other hand, we analysis failure characteristics of floor water inrush with FLAC3D software. The results of numerical simulation are compared with the results of the new evaluation method. The two results are basically consistent, further verified the rationality of the evaluation.

The working principle of balancing valve and the force of the main valve core were analyzed; the kinematic equation of main valve core was built in this paper. Through those analysis found that the oil cylinder weight, pilot control pressure, coefficient of spring stiffness and pre tightening force have important impact to dynamic performance of balance valve. Through the force analysis of roadheader’s cutting unit, established its statics equation and got simulation curve of cutting oil cylinder loads by MATLAB software. Through the simulation curve known that the load was decreasing with the cutting head rise; when the cutting head in the bottom and top position, the force of lifting oil cylinder would get maximum and minimum respectively. Using AMESim to do dynamic simulations get the result that when the load of oil cylinder is too big,the speed fluctuation will be larger and the shake time will be longer; the diameter size of control oil damping hole has small impact to system, but the smaller it is, the smoother of spool motion; large spring stiffness can be beneficial to the stability of the system; if the spring pre-tightening force is too big, not only have disadvantage to system stable, but also produce cavitation phenomenon to the balance valve.

In order to improve the adaptability to separate wet coal, the adhesion behavior between coal surface water and dense medium was analyzed, and the influence of coal surface water and dense medium water for the dry coal separations was investigated. In the same time, the contrast tests were done by the integration device of separating and drying. The results showed that it was an effective approach to separate wet coal by the integration device. With the air volume 8m3/h, wet coal was separated by fluidized bed at 50℃ for 2 min, the removal efficiency of coal surface water reached up to 91.5%,and the Ep value was less than 0.062g/cm3. With the increasing of the coal water and dense medium water, the Ep value increased and the separation effect decreased. In the same time, the bed pressure drop sharply fluctuates and the minimum fluidization velocity significant improvement by the increasing of dense medium water. The adhesion rate of dense medium significant growth firstly, then rich to the maximum, and gradually decreased finally with the increasing of adhesion time.

for studying the coal slime flocs size distribution during flocculation process, coal slime flocs size measurement system is established, the application of image processing technology processing flocs images, statistical analysis of flocs size distribution under different mixing duration. The results show that: the coal slime flocs size distribution in the process of not following empirical distribution power function distribution, but conform to the fractal distribution and the distribution G-S distribution function, the fitting R2 were greater than 0.96; when the flocculation process is relatively stable, R-R distribution and lognormal distribution can also be characterization of the coal slime flocs particle size distribution, it’s fitting R2 value as high as 0.99 and 0.97respectively.

Based on the small-scale level of a single mining unit, Coal mining subsidence crack distribution is measured by GPS, total station is used to determinate horizontal movement and deformation, the relationship between horizontal movement and deformation and visible width of dynamic coal mining subsidence crack is analyzed on the basis of counted visible width of dynamic coal mining subsidence cracks; Different measured points gap are compared with the corresponding predicted subsidence values along the marginal crack; The damage to the land due to ground crack is analyzed in the horizontal and vertical direction respectively, the smaller subsidence coefficient confirms the fact that the vertical soil damage, based on this, the fact that dynamic ground cracks will cause severe damage to the land in the short-term is pointed out, the damage to the land due to the marginal crack takes a long time and needs key harnessing; Combined with mining subsidence, the fact that strata movement due to mining is the contact to land damage caused by cracks is proposed, the power from the conversion of the gravitational potential energy and land stress potential, the characteristics that the thin bedrock and thick unconsolidated layers rapid spread movement deformation exacerbate the destruction to land due to crack in the early days of mining influence.

Because of the poorness and complexity of the coal mine underground and lacking of effective condition monitoring equipment in a long time, the “black box”, an recorder installed on the roadheader which of long continuous working hours and large storage, has been invented and used, and it could monitor and store working conditions of roadheader. Based on the data that “black box” recorded in the underground, torque of the cutting head could be derived by the combination of this data, voltage, current and other roadheader parameters. The one-dimension load spectrum of cutting head could be drawn on the basis of time domain. The static load component could be determined by the analysis on the mentioned load spectrum. Furthermore, according to the rain flow count method, the two-dimension load spectrum could be drawn. After analyzing the above mentioned image, the value of the static load and the range of dynamic load are accessible.

Abstract: Electric control system of a mining equipment was introduced. A variety of fieldbus’s structure and characteristics of the electric control system were analysed. All kinds of fieldbus’s implementation was illustrated. Function characteristics of the devices that were on the fieldbus were described. and finally the reliability design method of communication was explained. Application results show that the multi-fieldbus electric control system is simple, easy installation, easy maintenance, stable and reliable.

Based on the principle of infrared detection, MSP430F1611 was taked as the core to design a kind of infrared methane sensor. In order to improve the stability of infrared light and provide circuit over-voltage protection, voltage driving circuit was designed; Through the hardware filter circuit, signal acquisition still contained noise, and then , the signal after the hardware filtering , was filtered digitally using FIR filter; In the laboratory , the sensor was used to test standard methane gas ,and the measurement results show that the precision of the sensor is suitable for methane detection in coal industry.

This paper analyzes the impacts of coal price decline on the related variables of energy-economy- environment system in China based on a computable general equilibrium model. The result shows that the total demand of coal and energy rises, and the demand of oil, natural gas and clean power decreases. The total carbon emissions and the emission intensity of GDP increase. The output of most departments has different degrees rise. The macroeconomic value variables have different degrees decline; the actual macroeconomic variables have different degrees rise.

Electric power system innovation will have great influence on the coal industry development, to the problem that how to better cope with the impact innovation, based on the analysis of the advantages and disadvantages of power system innovation to coal industry in 2002 and the existing, the medium and long term will give priority to the adverse effects. This paper puts forward that the coal industry should be taken the four countermeasures that are industry joint, actively participate in the placement of electricity innovation, further strengthen the joint with related industries, extended the coal industry development space, which can provide certain practical significance for the coal industry to respond to the electric power system innovation.