Abstract: In order to adapt to the situation of coal, to reduce procurement costs of coal mining enterprises, to increase the promotion and application of directional drilling, economic directional drilling rig was designed. The key components of the drilling system as downhole motor and pump motor were imported parts. The main components of drilling rig by localization or improving the standardization rate, the general rate, to reduce the cost. The rig has been widely used in many coal mine after it's successful development, the maximum hole depth reaches 600 meters, which shows that every technical performance target meets the requirements of the original design.

A new quick coal mining technology about strip mining based on long-wall and short-wall mining is proposed. The new mining technology integrates the advantages of long-wall mining, strip mining and wongavilli mining methods in one. The new mining technology length of working face,remaining strip width and mining strip width are calculated. Remaining strip coal pillar stability is checked with three methods. The layout of the roadway, major workface equipment and production process are briefly introduced. The paper also calculates various movement deformation value of surface ground after the coal mining completed and analyzes influences to the surface buildings. Study results show that remaining strip coal pillar is stability, surface deformation is controllable. The new mining technology is technical feasibility and economic rationality and adaptable extensivity.

Abstract: Base on the deformation and failure of 1406 return airway under influence of mining of E’huobulake mine in Xinjiang, we analyze the deformation and failure mechanism of 1406 return airway under influence of mining of thick and hard roof and conclude that roof caving in goaf is characterized of long cycle, strong dynamic pressure, big given deformation and big failure depth to lateral coal. Besides, unreasonable section coal pillar is another major factor. Through theoretical calculation of pillar width base on the Elastic Core Theory and numerical simulation on pillar stress and lateral pressure, 18m is determined as the reasonable width between 1404 mining face and 1406 return airway.

Based on Mengcun mine, the main shaft equipment , such as the shaft guide, bunton, attended model and anticorrosion method, are detailed in this paper. Since buntons used in large ship are often long-spaned and heavily loaded, the deflection is usually excessive. In order to solve this problem, it is proposed to support the bunton by a beam. The beam structure feature and strength calculation are also given. These measures make the equipment safer and more reliable.

A serial field bus communication protocol is proposed, which is suitable for the monitoring system of coal mine belt conveyor. At first, the fieldbus protocol standard is introduced, and for the characteristics of conveyor system of coal mine, get conclusion from analysis of the protocol, the protocol should meet simplicity, reliability, real-time,etc.. And then the protocol architecture design is introduced in detail, the mechanism and strategy of improving the reliability of the protocol and finite state machine. This protocol has achieved good results in the application of monitoring system of coal mine belt conveyor, the result shows that the design meets the requirements completely.

Momentum equation of fluid mechanics is applied to calculate the flow force on 90 degree elbows, and the force on vertical shaft drainage pipeline was analyzed. The flow force on drainage pipeline can be divided into three cases, e.g. the hydrostatic pressure, the steady flow and the transient flow; the most dangerous situation appears during the transient flow. On the basics of these, the force on guide pipe support beams, welded straight pipe support beams and welded 90 degree elbows with horse are analyzed and calculated respectively. Using elbows less than 90 degree at the bottom of pipeline can reduce the force on support beam greatly, so as to reducing the cross section of support beams. Noticed that the influence of variation temperature in the shaft can be ignored when calculate the force on supporting beams. But special measures should be taken to eliminate the internal stress of pipeline caused by temperature changes.

According to the various design Institute and the hositing headframe used Mine on the impact of differential settlement of foundation on headframe feedback，In the course of revision of “Code for design of the mine headframes”, the organizations concernded carried out special studies on the impact of steel headframe. Through analyzing the causes of differential settlement，study of differential settlement influence on internal force and deformation of different headframes type, the rationality of “Code for design of the mine headframes” GB50385-2006 is discussed, and put forward amendments.

Abstract: This article contains the introduction of the background of 3D collaborative design, the module and function of Bentley 3D software factory, and the development of 3D collaborative design process and document management process. It studied a set of standard 3D design process combining with Shanxi Binchang Mining Group Co. Ltd. Xiaozhuang coal mine and coal preparation plant navigation project, and pointed out the shortcomings and future development directions of 3D collaborative design, which provided a reference for the following 3D design project of mine and coal preparation plant.

In order to improve the safety of trackless tyred vehicle running, reduce casualties, decrease of property loss , the ground of highway emergency lane concept is applied to the underground，setting the emergency lane in trackless tyred vehicle shaft is proposed. At the same time ，the main parameters of trackless tyred vehicle emergency lane is researched， the setting spacing，the length and entering angle of emergency lane is determined, This has a certain directive significance for the setting of trackless tyred vehicle shaft emergency lane.

Regard a coal as the research object, in view of the large mining height, enormous section and low advance rate, through comprehensive tunneling equipment upgrading, technology parameters optimization, production organization optimization to improve the efficiency and effectiveness of the excavation. Compared wtih the traditional excavation method, the advantages of the rapid excavation can be revealed in the following aspects: realizing mechanization supporting work, using CMM2-15C hydraulic drill carriage instead of MQT-120 pneumatic roof bolter and MQS-45 pneumatic hand-held anchor head, which can save the workers' labor and improve the efficiency and safety of the construction process. Supporting parameters optimization not only saves the supporting time, but also supporting materials. After using the rapid excavation technology, daily progress of roadway increased from 4.8m to 10.2m, through continuous detection about roadway roof after rapid excavation, find that roadway roof’s the biggest separated strata are less than the limit, roof stability and no roof falling risks. The successful application of rapid excavation technology, effectively save the construction time limit for a project, improve efficiency, and it plays a big role for high production and efficiency of the mine.

In order to solve the support problem of the track rise entry in the second mining area of Xigou Coal Mine, with the method of surrounding rock geomechanics parameters test, it was concluded that the track rise entry was located in complex tectonic stress area, and had rheological surrounding rock. Hereby, strength bolt combined with cable support system with full-length prestressed anchorage was proposed to reinforce roadway, then industrial test and mineral pressure observation were carried out. The experimental results showed that the bolt initial pretension force was range from 40 to 80 kN, the maximum axial force of bolt was 230 kN; it was basically reasonable that the cable pretension force was designed to 200 kN, surrounding rock abscission layer and damage were well controlled, the number and length of cable were reduced enormously; the final convergence of two sides was reduced by 80%, the maximum convergence was 152 mm; the roadway daily excavation level was increased, the scientificity and rationalization of support system were verified, which could provide theory basis for putting forward support design of roadway with similar geological conditions.

Abstract: This paper studies the anchoring experiment of waterproof anchorage agent used for disposal of floor heave. The withdrawal resistance of waterproof anchorage agent, anchorage force inside of water-bearing anchorage pipe with different aperture, as well as the withdrawal resistance contrast between ordinary anchorage agent and waterproof anchorage agent have been studied by adopting self-made waterproof anchorage agent. The study shows that: the withdrawal resistance of waterproof anchorage agent within water is above 200KN; the anchorage forces of anchor rope within ?45mm and ?50mm anchorage pipes are above 150KN and 110KN respectively; the average value of withdrawal resistance of waterproof anchorage agent within anchorage pipe with 100% water percentage is 196.3KN, the anchoring effect is 2.86 times higher than that of ordinary anchorage agent with 49% water percentage. In the process of using waterproof anchorage agent, should fully follow the principle of “three diameter matching” and the length design of anchorage section, otherwise the anchoring effect will be seriously affected.The new-type waterproof anchoring agent was successfully used on the floor heave section of air return tunnel of 2nd mining area of Jiangjiahe coal mine, it could improve the construction efficiency, shorten the construction period, and reduce the influence on anchoring force of anchor rope reducing caused by water.

In order to solve the problem of remained roadway is hard to be reserve in large mining height panel, this paper uses the secondary grouting reinforcement technology. To analyze the the strata - press behaviors and the roadway's deformational and destructive law,make the plan of secondary grouting reinforcement, use the high-efficient materials, optimized design the process parameters of the secondary grouting reinforcement , through the field observation and FLAC3D numerical simulation to check and analyze the grouting results. The test and numerical simulation results both indicate that after grouting reinforced , the displace between both sides of remained roadway reduces more than 65%, roof to floor displacement reduces more than 51% ,this technology solves the problem of remained roadway is hard to be reserved effectively.

Aiming at the problems of mining above hollow to 3#coal seam in Haitian Coal Mine, ”three -zone” method, surrounding rock equilibrium method etc are used to demonstrate the feasibility of mining above hollow to 3#coal seam, except that water drilling segment , drilled peep and FLAC3D numerical simulation method are used to research the behavior of 3#coal seam and overburden after mining of the overlying coal seam. The results from all the methods show that the 3# coal seam and roof rock strata are not destroyed by the occurrence of severe damage, but the internal damage and don’t present sidestep sinks which affects the normal mining of 3# coal. The height of caving zone is 2 ~ 4m above the roof of 9# coal seam , and the height of the fracture zone is 19 ~ 27m, which is less than the theoretical calculation. The 3# coal is in the curve subsidence zone of the 9# and 15# coal. The results show that mining above hollow is feasible.

Combining with the special production geological condition of 1126 filling face, strata behavior law was discussed by theoretical calculation, numerical simulation and field measurement. The critical breaking filling height of main roof was confirmed by thin plate theory. FLAC3D software was applied to analyze the law of plastic zone distribution and vertical displacement sinkage of the roof strata on fully caving mining method and high water filling method. The measured data show that strata behavior of backfill mining with high water material was relaxed. Working resistance of hydraulic support was low as a whole, the surface deformation value was controlled within the scope of the damage at level I.

Based on the principle of laser ranging, a kind of sensor to supervise roadway roof to floor convergence has been put forward according to the requirements of mine pressure analysis and the shortcomings of the current roof to floor convergence sensor. Use the battery for power supply,this sensor overcomes the disadvantage of high power consumption and Implement a large number of sensors distributed arrangement in coal mines. Experiments and field application shows high measuring accuracy, high transmission speed, strong adaptability to the environment are advantages of this new sensor.Also, this sensor can accurately and timely to reflect changes of roadway roof to floor convergence and provide a reliable data basefor dynamic monitoring and analysis.

This paper concentrates mostly on withdrawing and installation of the typical full mechanized coal mining equipments and introduced the characteristics of withdrawing and installation of full mechanized mining equipments, methods to Withdrawing and Installation equipments is stated with their advantages and disadvantages in this paper as well.

Development of highly water flowing fractured zone of mining face to the rational design parameters to ensure safety mining has significant influence, which faults are an important factor affecting the development of highly conductive water flowing fractured zone. Effects of faults with different dips and drops on the height of water-flowing fracture zone in steep mining face with soft overlying strata have not been extensively studied now. Numerical simulation method was used in this paper to study these effects on the background of No.3 coal seam in Xinhe coal mine, and effects of dip and drop of fault on the height of water-flowing fracture zone in steep mining face with soft overlying strata were revealed. The results indicate that the height of water-flowing fracture zone increases with both dip and drop of fault, and the rate of increase is larger when the dip is larger than 60°and the drop is larger than 15m. The height of water-flowing fracture zone in steep mining face with soft overlying strata is more than 16 times than mining height, and it is higher when there are faults in overlying strata.it can reach more than 20 times.

To solve the difficulties of mining the No.61 coal seam without destroying the overlying main entry in the Qidong coal mine, the methods of theoretical analysis and numerical simulation are adopted to study the mining-stress influence induced by overlying coal seam and surrounding rock movement regularities of the main entry. The research results show that the essential reason of the surrounding rock failure is the transfer of mining-induced stress which caused by the overlying coal seam mining, the stress concentration coefficient increasing to 1.5~1.8 times of the original stress value. The inducing factors of surrounding rock stress concentration and the maintenance principle of roadway pressure-relief should be taken into account in order to control the stability of the main entry underlying the coal seam. Based on the pressure-relief support theory, corresponding measures and technical parameters of the drilling blasting pressure-relief technology are put forward. Simultaneously, the pressure-relief technology is successfully applied to the main entry of Qidong coal mine. Engineering practice results indicate that the plastic weakening regions are interconnected through the drilling blasting. The pressure-relief technology could transfer the concentrated stress to the deeper part of the surrounding rock to reduce the degree of stress concentration. The main entry could keep maintain stability after the necessary pressure-relief measures are performed.

Ground pressure behavior at coalface with rotary adjustment mining method differ from the coalface adopting normal mining method. For solving this problem this paper employs FLAC3D software and field measurement to study the distribution of the abutment stress and its dynamic evolution characteristics during the advance of the coalface with 2321 coalface of Jinqiao coal mine as the research background. The research results demonstrate that the asymmetrical distribution of the front abutment stress prior to the arrival of the first periodic weighting at the coalface with the side abutment stress at the upside of the coalface larger than that at the underside. The peak value of the side abutment stress at the upside of the coalface reaches the maximum during the initial weighting. The derived results were validated by the field monitoring results and the engineering significance of this study was finally proposed.

Abstract：According to the response characteristics of tectonic coal to gas pressure, experimental studies about permeability of Two kinds of different coal samples were carried out with indigenously developed and improved experiment facility for triaxial seepage flow test to fluid-solid-thermal coupling gas filled coal. The results shows that permeability variation with gas pressure of coal samples have apparent Klinkenberg effect, the permeability changes of soft coal and hard coal samples conform to quadratic polynomial function. Under different confining pressures, the permeability of two kinds of coal sample with gas pressure changes greatly, Klinkenberg effect and inflection is also inconsistent, which is mainly affected by the sample adsorption constant. The reason for decreased first then increased of coal permeability: resulting in a reduced permeability of Klinkenberg effect and gas adsorption effect of coal matrix expansion under confining pressure and axial compression in the beginning stages, later pore pressure increase leads to increase the permeability of the coal plays a dominant role, those co-produced the effect. The research results provide a theoretical basis to improve coal-bed methane extraction rate.

The paper study on the “U” and “U+L” type ventilation system by the offshore module “Test Rig of Three-dimensional Flow Field”. By changing the distance between connection roadway and working face, the pressure between the intake airwayand return airway, we have analyzed the theregularities of gas distribution law of gob under different parameter conditions .The experimental results show that the gob air leakage intensity is linked with the pressure between the intake airway and return airway. High concentrations gas zone mainly concentrated in the compaction zone side of return air roadway.It's location and range along with the change of ventilation parameters change. We can focus on extraction from the zone in the construction site.If shorten the distance between connection roadway and working face, to some extent we can control the range of high concentrations gas zone in goaf area.

The paper presents the design and parameter selection of main circuit of the shearer traction converter system, gives its circuit structure and the implementation of the system hardware and software based on DSP, realize the synchronous PI decoupling current control of 4-Quadrant Converter. Experiment results show that the system provides the steady DC voltage as well as the 1ow harmonic line current，unity power factor and bidirectional power flow．The 4-Quadrant Converter improve the reliability and traction performance of the shearer, meet requirements of AC traction frequency operation of the shearer.

There is more powerful background noise and lower signal-noise ratio in mine motor and it is difficult to diagnose equipment fault signal. In order to solve the problem, the method of correlation differential resonator array for mine motor equipment fault diagnosis was proposed. According to applying this method to detect the vibration signal of mine motor axle stretch end, the result showed that correlation analysis could remove the background noise in vibration signal of mine motor axle stretch end and improve the signal-noise ratio. The differential resonator array could detect the motor signal with different frequencies and be accurately diagnosed the hidden faults in mine motor. Correlation differential resonator array was a new fault diagnosis method for mine motor.

Mechanical and electrical equipments which driven by motor play an important role in mining equipment. In order to have a effective condition assessment and diagnosis on mechanical and electrical equipments, motor current signal has been used to analyse the fault of mechanical and electrical equipments, and EEMD also be used for fault feature extraction from motor current. Experimental results show that the method is available.

Abstract: A fully three-dimensional numerical model is used to numerical simulation of condenser cooling water flow characteristics, and then research on the movement of the condenser flow field and flow resistance characteristics, comparing with the theoretical results on the design manual. Researches show that: Water among condenser pipes flow in three layers of water condenser and flow vortex exist in the cross-sectional area mutations, making mechanical energy loss be bigger; Due to the condenser pipe friction loss and the vortex exists, 3 three layer pressure reduces step by step and the condensing tube pressure drop the largest, 59.44%; Simulation of condenser water resistance is 91.26 kPa, and manual result is 90.05 kPa. Two results are closed, and the error is only 1.4%, proving the correctness of the numerical simulation method. Using numerical simulation method can optimize the structure of condenser and to improve the cooling efficiency.

CO2 geological storage in coal seam is one of the four technical scheme of CCS, is an effective way to reduce CO2 emissions. According to a new round national CBM resources survey result of coal seam gas recoverable reserves, based on the method for calculating CO2 geological storage potential evaluation in the main coalfields of our country recommended by carbon sequestration leaders forum (CSLF), CO2 geological storage potential of the buried depth of coal seam in the 1000 ~ 2000 m are calculated, the total potential of coal seam gas of 28 bearing basins in China are 98.81×108t. Moreover, the basins are Ordos basin, Junggar basin, Tuha basin, Hailar basin, which the CO2 geological storage potential are more than 10×108t. The four basins total storage potential is 68.45×108t, accounted for 69.27% of national total storage potential, will be the main basin coal field CO2 geological storage in our country.

The effect of the fine coal fractions on the flotation of the coarse fractions was studied by the laboratory experiments and theoretical analysis. The results showed that the coarse fractions exhibited a fairly high flotation recovery while showed a sharply decrease by 65.69% in the presence of the fine fractions, however, the kaolinite has none effect on that. The concentrate yield rose up with the increasing collectors, however, it kept steady ultimately. The concentrate yield of the coarse fraction increased by 18.86% with an addition of 2500g/t sodium hexametaphosphate due to the reduction of interaction force between the coarse coal and fine coal particles caused by the sodium hexametaphosphate. Fine coal particles were mainly constituted by coal and mineral impurities associated body with both hydrophilic and hydrophobic surfaces. The extended DLVO theory analysis showed that slime coating can reduce the hydrophobic surface area and inhibit the flotation of the coarse coal.

Taking Jinglong coal as the study object, the low-temperature drying experiment was carried out to investigate the effect of drying temperature on coal drying, re-absorption and crushing characteristics. The results show that, the low-temperature dry of 50~100℃ can make the most of its moisture evaporate at a rapid speed; besides, the higher the drying temperature, the faster evaporation rate and the lower the equilibrium moisture. After low-temperature drying, the re-absorption effect of pulverized coal is not good, but will be improved slightly with the increase of drying temperature; the average particle size of pulverized coal decreased slightly and shows no obvious relation with the drying temperature.

In order to explore the synergistic effect and kinetics of co-pyrolysis of floatation tailings and pine. By means of thermogravimetric analyzer（TGA）, the characteristics of co-pyrolysis of floatation tailings and different proportions of pine were studied , and the N (N = 1, 2, 3) level kinetics model were analyzed and calculated for co-pyrolysis of floatation tailings and different proportions of pine. The results suggested that the pyrolysis rule of pine was different from floatation tailings, and the maximum weight loss rate of pine was higher than floatation tailings. When the final pyrolysis temperature at 900℃, the weight loss of pine and floatation tailings was 74.33% and 13.25%, respectively. The temperature range of the main pyrolysis stage of the two main parts of each other was overlap, but the possibility of the occurrence of mutual synergy was big. When the proportion of pine in 20% ~ 80%, the kinetics equation of pine and floatation tailings co-pyrolysis with a good fitting. The activation energy of pine and floatation tailings co-pyrolysis was lower than the pyrolysis of floatation tailings and pine alone. This is good for the co-pyrolysis reaction, which leads to more release of volatile matter.

The spontaneous combustion of pulverized coal is closely related to its oxidation characteristics at low temperature. In this article, the adiabatic oxidation characteristics of three normal pulverized coal commonly used in pulverized-coal industrial fired boiler has been studied by adiabatic oxidation, and the heating curves and the gas yield were gained. The results show that the higher the volatile matter content of the afterburning fuel pulverized coal is, the lower the low-temperature oxidation activation energy is, and the stronger the coal spontaneous combustion tendency is. The concentration of CO, CO2,CH4 increases with the coal temperature, while the concentration of O2 decreases. Considering various factors, CO concentration can be used as the main indicators of early warning, and CH4 and O2 concentration can be used as secondary indicators.

By measuring the relative dynamic elastic modulus and quality loss, the research of the frost resistance of concrete mixing with ground granulated blast furnace slag (GGBS) has been done. The effect of GGBS content on the slump, strength and frost resistance of concrete are analysed, and comparative studying on the freeze-thaw resistance of concrete mixed with frost-resisiting admixture and no frost-resisiting admixture have been analysed. The results indicated that the slump of the concrete increased with the increase of GGBS content; excessive mixing GGBS has a negative effect on the early strength of the concrete and that the frost-resisiting admixture can greatly improve freeze-thaw resistance of concrete.

With the purpose of solving the problems that come from the spread and application about coal chock carrier with a trailer，the design features of chock trailer are analyzed. And based on the advantage that the semi-trailer fifth wheel is compact, the three-axis hinge mechanism in chock trailer, which influences the service performance of chock carrier, is improved, and the vehicle parameters are optimized, and the underworkings adaptability of the vehicle is refined. Meanwhile, with the special road conditions in coal, the using features of the chock trailer fifth wheel is researched, and some rational maintaining measures are suggested, which assured the service life of the fifth wheel.

Achieving advanced control of major hazard sources of gas is an important basis to ensure sound development of coal mining industry. With the gradual strengthening of the national demand for coal mine safety, the traditional mode of coal enterprises in cooperation with scientific research institutes has been difficult to adapt to it. In order to solve this problem, influence factors of professional synergetic management and control of major hazard sources of coal mine gas were analyzed. Then its evolutionary process was studied. On this basis, Professional synergetic management and control mode of major hazard of coal mine gas was proposed creatively. And the operating system which matched the pattern was established. The demand of both coal enterprises and research institutes were taken a full consideration in this mode. And new ways of deep collaboration of production and research of it was provided, which opened up new roads to speeding up transforming scientific and technological achievements. This mode has been successfully used and promoted in Shenhua group, which made significant economic and social benefits.

Deepening engineering construction in coal industry’s prospecting and design companies and strengthening foundational enterprise management are expected to become two major driving forces to promote upgrade and transformation within a given enterprise. Based on the current development and management models in coal prospecting and design companies, the article discusses the significance, objective, goal, context and categorization of team building. It not only proposes solutions that span different issues, but also differentiates among distinct management models. Covering specialized management areas such as prospecting design, engineering, production and execution, it sheds new light on enterprise administration.