为了解决宝日希勒露天矿南帮软岩边坡的大范围变形失稳问题，采用GeoStudio岩土环境模拟计算仿真软件与三维离散元软件3DEC分别就内排压脚对软岩边坡稳定的控制作用与内排追踪距离的优化方法进行了研究。结果表明：内排压脚方法对于端帮边坡稳定控制作用明显，当内排追踪距离为40m时，边坡变形可以得到有效控制，而且生产工作可以实现正常接续。研究成果的科学性及适用性得到了实际生产的验证，值得条件类似矿山广泛借鉴。

The capacitive current of long cable line can cause a bigger loss of power,a lower power factor and the disconnecting switch cann’t cut and close the unloaded line and so on. On the basis of power flow method for cable line, we get the conclusiont that the reason for these problems is the excessive capacitive reactive power that produced by the excessive capacitive current of unloaded or light-loaded cable. when the capacitive current of unload line exceed 5A, the method to limite the capacitive current by shunt reactor that installed on line side of circuit breaker. when the capacitive current of unload line less than 5A ,but the capacitive reactive power transmit to power system when the line run in light-load, the method to limite capacitive current by shunt reactor that installed on high voltage bus or SVG that installed on Transformer Low Voltage Side.w to use the shunt reactor or SVG to limite the capacitive current.

In this paper, the reactive power compensation device based on proportional resonance control algorithm is used to solve the power quality problem of power grid. This paper analyzes the proportional resonance control algorithm and the principle of reactive power compensation device. Comparison and analysis of power factor, voltage, current and harmonics of power grid before and after equipment input in a mine. The effect of this device on improving the power quality, increasing the power factor and saving energy consumption of low voltage power supply system in coal mine underground is verified.

The current production status of 6.00 mt / a in Liang Shui Jing coal preparation plant does not match with the current situation of 8.00 / a lifting capacity of coal mine, lump coal washing system and dust coal washing system, raw coal gangue yi, load saturation of coal slurry system, etc., taking into account the existing production status and industrial site conditions of coal preparation plant, combining with the requirements of product users on calorific value, in line with the principle of minimum impact on production and minimum investment, through optimizing the process of coal preparation plant, the processing capacity of each washing system can be fully utilized to increase the processing capacity of coal preparation plant..

The influence of goaf on the stability of high-voltage transmission line towers has become a key problem in engineering construction. Based on the geological and hydrogeological conditions of a 500kv high-voltage transmission line over goaf in the southwest China, The paper explored the distribution of goaf, determined the height of the collapse fault zone and the depth of the impact of the building load, Besides, it makes analysis and evaluation on the stability of the tower foundation; And it also calculated the residual deformation of goaf, and analyzed the line security. The results show that: the impact depth of the load will not be transmitted to the collapse fault zone of N6 tower, the tower foundation is stable, residual deformation has a slight effect on the tower，high voltage transmission line operation is safe.

In order to solve the high roof subsidence and serious sides shrinkage problems occurred in the excavation process of the large cross section open-off cut, the method combined with theoretical analysis and field observation is applied to study the pressure-relief reducing span, roof Control and stress loss compensation support in Large Section Open-off Cut, determining construction technology by secondary cutting stone and secondary acid support, and identifying the construction effect. The result shows that the surface displacement of small section is minor, and secondary side slope extension increase obviously, the relationship is 174mm by roof and the displacement is 322mm by sides, which the large section open-off cut tend to stable in 45 days, and enable control surrounding rock deformation.

According to the mining and driving mechanized percentage imbalance contradiction occurred in the coal mine，the paper studied the seam gateway rapid driving technology and mode.Basted on the station of the rapid driving technology development,the paper pointed out the problems of traditional rapid driving technology.The paper reviewed the development and present status of the intelligent rapid driving technology research in China and brand,and discussed the key technology and development tendency of intelligent mine seam gateway rapid driving technology.The successful practice of efficient and rapid driving system in Shendong showed that the development ideas of matching，systematic，intelligent driving technology and equipment was correct,meanwhlie,the development prospects of the driving technology and equipment from the driving，support and transportation integration to the driving，support，transportation and auxiliary integration was put forward.

Abstract: To improve a series of safety questions caused by large areas of hanging arch on steep working face, the paper was based on 26221 face of 2130 coal mine in Xinjiang Province, problems such as abnormal increase pressure of mining face roof and roadway surrounding rocks, roof falling and rib spalling accidents occurred frequently, hydraulic support slipping and falling on working face were studied, thinking and principle of hard roof control on steep working face was mainly analyzed, main program of super-deep hole’s advanced presplitting blasting was determined. The maximum length of the hole in transportation tunnel was 95m, strata pressure action law and roof caving effect showed the program was safe and reliable.

Abstract：To improve the coal pillars and mining roadway stability, the grouting reinforcement scheme is designed according to the Changping coal company Ⅲ 4309 6 m small coal pillar. The following scheme parameters are obtained: (1) The different grouting drill arrangements are determined according to the tunneling along floor, proof and the transition zone. (2) The grouting work is completed twice. The first work will be done during the mining, working at Ⅲ 43093 roadway, grouting area is selected in the region which is front of the face 20 m~ 40 m. The second grouting reinforcement provides the conditions for roadway retained, grouting work is selected in the region which is behind of the face 50 m~100 m; (3) The material selects federal grouting reinforcement material. The grouting pressure is 6 MPa~8 MPa. The first grouting, water-cement ratio chooses (1~1.2):1. The second grouting, water-cement ratio chooses (0.8 ~ 1):1. (4) A total of 46 grouting holes are constructed in the experimental roadway. The results of the borehole reveal that the surrounding rocks are intact and well integrated. The maximum floor displacement is 400 mm, and the maximum convergence of two side coal-walls is 350mm. By means of grouting to reinforce the small pillar, maintaining the stability of the roadway, which meets the needs of the safety production. It provides the engineering reference for the small pillar protecting roadway under similar conditions.

For abnormal problems of no coal cinder，large slag discharging，lower rate of pore-forming and etc. when drilling in the seam with a combination of soft and hard interlayers in Jincheng Mining Area. The auger drilling technology with deep grooves and wide blades was proposed. The suitable drilling assemblies were developed and the applicability of the auger drilling technology was verified by the experiments. The results showed that the Φ95/60.3mm Spiral drill rod was better than the Φ110/63.5mm Spiral drill rod at rate of pore-forming. The Φ95/60.3mm Spiral drill rod with deep grooves and wide blades had a good adaptability to the seam with the structure of soft-hard interlaying，and it was useful for drilling in the seam. The auger drilling technology with deep grooves and wide blades has its advantages in solving the problem of high efficiency drilling in soft and hard coal seam.

Abstract：With the increase of mining intensity in Dongsheng coal field, the disasters of strong mine pressure appear more and more serious. One of the important points in the prevention of strong mine pressure is to study its characteristics. According to the situation of the working face, the dangerous area of a strong mine pressure accident is divided. And the layout scheme of mine stress and microseismic monitoring system is determined. Thus the dynamic monitoring of the strong mine pressure of No. 31102 working face is realized. According to the theoretical model, the distribution law of advance support pressure of the working face is analyzed. A microseismic monitoring system is used to analyze the roof. Through the analysis of this method, the influence range of the advance support pressure and the development of the crack in the roof are found out. The relationship between production speed and microseismic energy is studied by using the data of monitoring system. The reasonable production speed of dangerous area with strong mine pressure is put forward. Thus, the risk of strong mine pressure disaster is reduced.

The retractable pier column is a new roadway supporting body which is supported by coal mine roadway. It is also one of the most concerned issues in the inclined face. It is of great theoretical significance and application to carry out this research. value. Based on the background of Fengfeng Group Wutongzhuang 182208 working face, combined with the special structure of the steel pipe nesting in the upper and lower sections of the pier column, the mechanical model is established, and the stress condition is analyzed. Angle of the formula. The results show that the size of the pillar of the pillar is related to the thickness of the old roof, the direct top and the angle of the face. The angle of the mountain and the roof and the vertical top are exponential, and decreases with the increase of the thickness of the old roof Small, with the increase in the thickness of the direct top. Through the field test results, when the mountain angle is 2.4 °, it can effectively control the bending deformation of the pier structure and improve the bearing capacity of the pier.

Zhujiadian coal mine drainage system has serious water hammer phenomenon when the gate valve is closed. In this paper, a feedback gate-control waterproof hammer system based on the shock pressure, the vibration of pipeline and the signal of velocity is designed. By controlling the speed of the shutoff valve to reduce the water hammer, and through a large number of experiments to select the best shutoff valve speed. Compared with the impact pressure of pipeline when no control method is adopted or different control strategies in the same time of closing valve is adopted. The experimental results show that the method can effectively protect water hammer and produce less impact pressure than other methods.

In order to explore the main geologic controlling parameters on CBM wells productivity in small scale, deeply analysis on geologic and drainage data of 26 CBM wells are carried out, employing geological analysis and gray correlation analysis. The results show that deliverability of CBM wells has a good relationship with burial depth, coal thickness, gas content, permeability and dredging index, which are main controlling factors, then the order of importance of five geology factors is obtained by using gray correlation analysis, the correlation degree in decreasing order: dredging index, gas content, permeability, coal thickness, burial depth. Dredging index can better reflect potential capacity of CBM wells for characterizes gas-water flow capacity synthetically. Meanwhile, the deliverability of CBM wells is controlled by the coupling of various geological factors, and there is no obvious gap on productivity influences of any single geological factor.

The average raw coal throughput of Halagou coal preparation plant is 3000t/h. The basic technology process is +13 mm raw coal was separated by three sets of shallow trough, besides -13mm raw coal was separated by heavy medium cyclone separation or directly was carried into the products storehouse. The cost of lump coal system is less 8.12 yuan/ton than the slack coal. After the feeding limit is adjusted from +13mm to +6mm, lump feeding increases 302.62t/h. The cleaned coal yield of theory is 85.51%, increasing 2.17%. The cleaned coal ash of theory is 4.61%, decreasing 4.61%. The quantity efficiency is 94.62%, increasing 4.28%. After all, this cost can be economized more than four hundred ten thousand yuan per year.

The paper expounds the operation situation of the three products of Xingtai coal preparation plant firstly, and points out the shortage of middlings coal products. Secondly, the influence trend of each key structural parameter on the sorting effect is analyzed in detail from the key structural parameters that influence the sorting effect of the two-segment cyclone. Finally, the new optimization and transformation of the three-product cyclone based on the theoretical analysis of the actual production demand has achieved the desired effect.

To research the impacts of fault angle on the slope of dip bedded slope in surface mines, with eastern slope in Yuanbaoshan Surface Coal Mine as the engineering background, FLAC3D is used to simulate the F1 fault ,the sliding mode and the stability of the slope are compared under different inclinations. It is shown that the stability of the eastern slope in Yuanbaoshan Surface Mine is primarily controlled by the 4th weak layer and the angle of fault F1 is one of the important parameters which influence the stability of slope, that when the angle of fault F1 is more than 45° and less than 60°, the eastern slope stability of Yuanbaoshan Surface Coal Mine must increase linearly with its increase and that when the angle of fault F1 is greater than or equal to 65°, the slope failure mode and stability is no longer affected by fault F1.

Abstract Proposing underground coal mine two-dimension accurate personnel positioning method: locating substations are installed interval at certain distance in the underground gallery,in underground galleries,locating substations are arranged along one side of the gallery, and ensure that the positioning card can communicate with two neighboring locating substations at the same time.The adjacent two locating substations of any positioning card use TWR or SDS-TWR ranging method to measure the distance between the positioning card and the two locating substations respectively.Since the distance between the two locating substations is known when locating substationsare installed, based on the distance between the positioning card and the two locating substations and the distance between the two locating substations, the gallery horizontal radial distance between the positioning card and the locating substations, andthe galleryaxial distancebetween the positioning card and the locating substations are calculated, then according to the positioncoordinates of the two locating substations, calculate the two-dimensional positioncoordinates of the positioning card in underground galleries.

Abstract：In order to study the influence of the drilling technology on the stability of roadway surrounding rock, and to realize the fine blasting and reduce the damage of surrounding rock, cylinder cut and wedge-cut blasting scheme are designed and the corresponding blasting experiments are carried out. The detection of blasting vibration signals is analyzed by using HHT method and the time-frequency distribution and energy spectrum of the signal are obtained. Fianlly the twocutting schemes is compared and analyzed. The result shows that main frequency of cylinder cut is higher and the main frequency band is smaller, and the high frequency energy is larger. The main frequency of the wedge-shaped cutting signal is lower but the frequency band is wider, the lower frequency energy ratio in the signal increases. The former of surrounding rock damage is greater than the latter and all guarantee the stability of roadway surrounding rock.signal is lower but the frequency band is wider, the lower frequency energy ratio in the signal increases, and the energy homoification appears obviously. The former of surrounding rock damage is greater than the latter and all guarantee the stability of roadway surrounding rock.

Based on the analysis of the influencing factors of pipeline wear, the quantitative research on the wear of slurry on the pipe wall is carried out by designing a roller device. The results show that when the solid content of slurry is kept at 80 % and the rotating speed of drum is 1. 5m / s, the abrasion of the roller wall caused by tailings is relatively serious than that of sand. When 50 % of solid phase mass is changed from sand to tailings, the class I wear rate will increase by 17 % and the class Ⅱ wear rate will increase by 15.7 %. The class I wear rate of the slurry made of tailings is 11.1 % higher than that of the slurry made of sand, and the class Ⅱ wear rate of the slurry made of sand is 7 % higher than that of the slurry made of sand. Using tap water to make slurry, the class I wear rate of roller wall is 2.4 % higher than that of mine water, and the class Ⅱ wear rate of roller wall is 4.5 % higher than that of mine water. The results show that there is no obvious difference in the wear of pipe wall between the filling slurry made of mine water and tap water.

Based on the two phase flow principle, the drilling technology of pneumatic conveying slagging was theoretically research in soft and outburst coal seam. The bigger the resistance to flow is, the more pressure losses, so it is very necessary to reduce flow resistance. The influencing factors of flow resistance are analyzed and discussed, and on basis of this solutions are put forward with reducing "internal resistance" and decreasing "external resistance". The calculation and analysis indicates that the flow resistance is greatly reduced while increasing the bore diameter of drill pipe joint, reducing the steep angle of joint and optimizing structure parameters of helical blades.

The main purpose of the paper is to study the morphology and variation of the air core in the gravity-fed three-product heavy medium cyclone, the unsteady Reynolds stress model was used to simulate the influence of the parameters and operating parameters of the first-stage cyclone on the air core. And then analyze the impact on energy consumption and separation. The results show that the internal air column of the cyclone is basically formed at 21.67s, and the second-stage cyclone is preceded by first-stage cyclone to form an air core. When the feed velocity is less than 4m / s, the air core cannot be formed in the cyclone. More than this critical velocity, a complete and stable air core can be form. The excessive feed velocity will reduce the volume percentage of air core in first-stage cyclone, and lightly increase volume percentage of air core in the second-stage cyclone. The diameter of the overflow pipe of first-stage cyclone is 380mm, the insertion depth of the overflow pipe is in the range of 410mm-610mm, the volume percentage of air core is lower, the air core is small and the stability is strong.

The process forming of Coal,as sedimentary rock, influenced by physical,chemistry,biological and geological structure and due to the dual structure of pore and fracture,the mesostructure determined the moisture formed of migration in coal seam. For improve the efficiency of integrated mechanization of top coal and study the characterization of mesostructue of coal seam influenced of different immersion times by XRD,XRF and ultrasonic methods.

The experiment was carried out by using the laboratory fluidized bed, which is the research object of the coal coarse with -2.0+0.5 mm. The optimized Design of low-density, low-density coal pellets was carried out by design-expert 8.0 software, and the optimal solution for the flotation of different particle size particles was carried out. And the full graded full level density fluidized bed flotation, the results show that, when the rising flow velocity of 1.39 cm/s, airflow apparent velocity of 0.104 cm/s, collector reagent dosage of 9.0 μL/L, ash is 12.23%, the tailing ash can be divided into 54.94%, yield is 45.06%.

In order to understand the influence of ultra-fine coal surface properties before and after pretreatment with liquid CO2, the experiments of surface modification was performed in a column type agitator. And Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and micro-calorimeter were used to analyze the variation of surface functional groups and wetting heat. The results show that liquid carbon dioxide could change the percentage of hydrophilic and hydrophobic functional groups, with the reaction time, the content of hydrophilic functional groups increased, the wetting heat decreased gradually.

The sludge produced during the coal-to-oil process was mixed with lean coal to prepare the coal/sludge water slurries. The effects of sludge addition on the viscosity, rheological properties and stability of the slurry were investigated. Results showed that with the increase of sludge content, the viscosity of slurries decreased and the maximum slurry concentration decreased. When the sludge to coal ratio increased from 0% to 15%, the maximum slurry concentration decreased from 73.08% to 65.38%. The addition of sludge causes the coal slurry to change from expanding plastic fluid to yielding pseudoplastic fluid, and with the increase of sludge addition, the pseudo plasticity enhanced. In addition, the addition of sludge can significantly improve the stability of coal water slurry.

Anthracite based porous carbon was prepared using anthracite as precursor, treating by mixed acid pre-oxidation and activating by KOH in argon atmosphere at 800℃. The structure of porous carbons were studied based on powder X-ray diffraction (XRD), Raman spectroscopy (Raman), and Field emission scanning electron microscopy (SEM), and the activation mechanism was discussed. Electrochemical prop-erties were investigated base on the cyclic voltammetry and constant current charge discharge in the three-electrode system. The results show that the activation of anthracite is mainly due to reaction of KOH and anthracite and relate to potassium vapor running into the graphite-like layers, enlarging pore size under high temperature. New reactive points are introduced into the oxidized coal surface, which intensify the ablation and form hierachical pore structure finally. The specific capacitance of the activated anthracite is 99.71F/g, while the figure of anthracite treated by pre-oxidation increases to 112.59F/g under the current density of 0.2 A/g. The capacitance retention of oxidized anthracite after activation remains more than 50% under the current density of 20 A/g, which means it is good electrode material for supercapacitor.

Abstract: The ashing characteristics of Baori lignite were studied by plasma low temperature ashing method (LTA) and medium temperature ashing (MTA). The results showed that the content of the residue was 18.59% through LTA treatment, and the XRD mineralization peak was clear; The oxidation method was showed a difference with the temperature of LTA. The organic matter is not completely oxidized and ashing residue are 32.58% and 21.67% respectively at 150~200℃. The ashing is more complete at 250℃ and the residue is 17.51%, and the characteristic peak of mineral is easily to identified.The ashing product is over-oxidized and mainly composed of oxidized minerals after higher than 300℃. Method of MTA at 250℃ can be used instead of LTA method, and the required ashing time is 20h.

Measured the first six-order natural frequencies of the shell of counter-rotating axial flow fan by modal test, the fourth harmonic of the fundamental frequency of fan was similar to the fifth-order natural frequency of shell, so we should optimize the structure of fan to avoid resonance. When the fan operated at the highest point of efficiency at the rated condition, measured the vibration of different directions in different positions. Results show that, the vibration at inlet and outlet of the fan is small, and the frequency is mainly doubling of the base frequency of the fan. The vibration at impellers and motor is large, and the high wide-band frequency is mainly caused by the aerodynamic force of the flow field. The vibration of the fan's top horizontal direction is the most severe, which can be reduced by adding a damping device at the top.

Abstract: the coal mine water treatment plant filtration device was studied and introduced the structure of filter device. The four stage filtration device was designed to achieve the hydraulic system of forward and reverse flushing in continuous water supply condition; the hydraulic motor was provided in the appropriate speed to gap filter and fiber filter L, R washing tank in hydraulic system. AMEsim software was used to simulate the design of hydraulic system and hydraulic oil system, analysised of fiber filter tank L、R and folding filter flow-time curve, analysised of hydraulic motor speed-time curve; obtained the conclusion: the design of the hydraulic system and hydraulic oil system meet the requirements of using.

Aiming at the short life and low efficiency of conventional single-tooth PDC directional drill bits and conventional reamer bits used in the drilling of medium-hard strata in coal mines, as well as conventional reamer drill bits were difficult to drill along the original hole trajectory. In view of the demands for the three kinds of drill bits in the directional long drilling hole, two new PDC bits were developed. The PDC directional drill bit were designed with scraper flat structure, the cutting teeth arrangement was optimizing, the reaming drill bit with circular arc profile, and the cutting teeth was arranging along the bit profile, these two kinds of PDC bits carried out on-site applications. Field application shows that, the new PDC directional drill bit control is good, drilling stability. In the mid-hard ground drilling efficiency and life significantly improved, is the ordinary single-tooth drill bit 2 times, the new reaming drill can be drilled through the pilot hole trajectory, drill life is more than 3 times the normal reaming drill bit.

To provide the basis for the optimization of China's energy structure, coal consumption forecasting model of coal consumption is studied. Based on ARIMA,GM and ANN, 3 single forecasting models and 8 compound forecasting models are built to forecast the coal consumption of China. To forecast and analyze the development trend of China's coal consumption in the next 10 years The optimal model would be selected through the parameter evaluation of R, MAE, MAPE and RMSE. The results show that the parameters MAE, MAPE and RMSE of optimal combination weighting model are smaller, and the prediction effect is obviously better than single prediction and simple combination model. The weight of optimum weighted composition model ARIMA-GM-ANN for China's coal consumption is (0.73,0.09,0.18). The growth trend of coal consumption is divided into three stages: "slow rise", "rapid growth period" and "stable period". After 2013, coal consumption growth tends to be stable, and the growth rate of the chain is more moderate, about 1.0% ~ 2.0 %.