Surrounding rock intense deformation and easy roof caving of composite roof, is one of the difficult roadway supporting technology. For Xincun coal mine 3207 rail lane gateway loose and broken composite roof, large amount of roof subsidence, anchor cable broken, etc. Combining with onsite investigation and mine pressure observation, authors analyzed the reasons of roadway deformation and failure, the rule of composite roof roadway deformation and main control technology, proposed coordination support of grouting anchor and anchor net, to strengthen the intensity of roof support and give full play to the bearing capacity of surrounding rock. Using "prestressed hollow grouting anchor and bolt-mesh-anchor" combination supporting scheme, the onsite industrial test showed that the support scheme can effectively control the deformation of surrounding rock of roadway.

With the increasing depth of underground coal mining, deep rock stress constantly complicated, especially in soft rock roadway. Combining Tangshan Kailuan Coal Mine Group, through the soft rock under conditions of T1493 and T1493 Bypass Roadways as the research object, through in-site geological structure detection, the evaluation of engineering geomechanics was made. The comprehensive methods, which included theoretical analysis and numerical simulation methods were applied here to analyze the disability mechanism of soft rock roadway in high stress condition. A reasonable supporting design was putted forward to ensure the safety in mining. Our research has provide to achieve a scientific effects and could provide a technical reference for other mines in similar geological conditions.

Regarding the problems in building the standard systems of supporting equipment and strata control in coal mine, this paper introduces the technology development and standard system building process of supporting equipment and strata control in coal mining. Current domestic and international situations are also discussed in this paper. It analyzes the requirement of standardizing supporting equipment and strata control in coal mining. It brings up the standard system frame of supporting equipment and strata control in coal mining. In addition, this paper studies the technology standard of supporting equipment in coal mining, single hydraulic prop, other supporting equipment, power system, parameter measurement of coal and rock mechanics, and etc., promoting the implementation of supporting equipment product and technology standard. Finally, the study analyzes the outstanding problems in the standardization and draw relevant conclusions based on the analytical results.

The arrangement of the characteristics of JiNing mine roadway design, in order to save investment, shorten the construction period, reducing the amount of construction principles, optimizing the layout of the mining area and water storage system pump house. It gave full play to the role of the pumping station at the same time, vertical submersible pump house pumping stations merged with Roadway chambers, water wells, with wells and other chamber, simplify setup Pump House Chamber, reducing the dense arrangement of pump house chambers, and to avoid mutual interference between the roadway engineering stress and achieve stability Water Pumping Chamber overall improvement, reducing the amount of pump house construction projects, saving the mine construction investment. The design concept to be implemented in JiNing mine, mine construction is similar to the accumulated experience.

The phenomenon of cross-border exploitation of coal mines is prevalent in our country. For real-time monitoring of the existence of cross-border mining coal mine, we design a high precision mine anti-theft monitoring system based on ARM and FPGA. Firstly, sensors and front-end acquisition control module acquires blasting vibration signal under the mine, and transmit it to ARM main control module. After processing the data, transmission it to the monitoring center by wireless for analysis and processing. System synchronized sampling between different collection terminals by using GPS. In addition, the system uses wireless sensor network to transmit data, increase the flexibility of installation and lower construction costs. The results show that: the system can accurately determine the location of cross-border exploitation and time, realize real-time monitoring the mining information underground. It is facilitate for the government to implement supervision and management to the mining.

Aiming to the prominent problems such as inefficient transportation of gangue, environmental pollution and ground subsidence that existed in coal mine by traditional mining technology , This paper based on the analysis of coal source and quality in Ultra large coal mine, innovatively applies the technology of dense medium shallow groove in coal mine, design the separation system of coal-gangue of ten millions of tons of coal, realize the gangue notlifting ,bring forth a valuable experience that can learn from,can be copied, can promote for coal clean production and green mine construction innovation.

In the economically developed regions, the contradiction between energy demand and environmental pollution is increasingly prominent. It is an effective way to reduce the total emissions and improve the quality of the environment type CWS plant, high concentration grinding and pulping technology was designed and used. This paper emphatically introduces the main production process and the device configuration, as well as industrial production commissioning. Results show that the quality of CWS can achieve the design requirements and the product can fully meet the user’s demands.

Paper designs a secure authentication system for LonWorks control network. A Nonce method using time server based hardware,can be used for identifying the time server information, to overcome the traditional control network to identify "long messages" inefficiencies, can deal with the "replay attack" adapt to industrial control network bandwidth is limited and real-time features. The experiments prove that this method is simple and effective, and reliable performance.

This paper set coal face 8102 in Wolonghu Coal mine as the research background and comprehensively analyzed its current economic status and geological conditions. We proposed backfilling technology for gob-side entry retaining using new cement concrete by analysis of movement characteristics of the overlying strata and theoretical calculation of the support resistance from the entry-side backfilling materials. Finally, parameters optimization of the backfilling technology is completed using numerical simulation. The in-situ monitoring of the surrounding rock stress proved the successful application of this technology in coal face 8102.

Mine in 21203 Fully Mechanized cut in the mountain exploration put old empty water engineering design, construction process, from the special probe Roadway design, drill field protection, comprehensive exploration drilling water control orifice means drilling for design and construction management, Yungaishan Well Field 1 seam drilling escape security technology under construction in soft thick seam conditions to ensure the safety of construction projects and achieved significant safety and economic benefits.

To ensure through the sign K6 sandstone aquifer of Yongxia mine security and efficient, in construction the Main Shaft -565m~-705m bedrock segment of Shunhe Mine , we applyed face large section Pre-Grouting for water-blocking ,in the end ,the hole water inflow reduced to 1.01m3/h or less, achieved remarkable results, create favorable conditions for driving and masonry shaft , wellbore to be safe and smooth off the bottom.

Because of geological conditions changes, cut of No.1306 workface was arched of Guo-jiahe coal mine, that made the installation difficult. Aimed at the situation, studied and proposed technical way to install rapidly of fully mechanized caving faces, which realized the workface installed rapidly, safety and economization. Applying this technology, it provides a mature technology experience for installing the workface with the similar conditions.

As the first mining layered of a special thick seam, Fully mechanized mining face 0102102 has a Characteristics of high gas content and emission and a high permeability coal seams. Based on geological conditions, And analysis of the main sources of influence Face Gas Emission.Through the three-dimensional grid of Comprehensive Extraction Technology,Using present seam extraction technology of Directional drilling、Cross - seam Holes、drilled along seam and adjacent layer drainage technology of Directional drilling pre-drainage gas. During mining ,Also using drilled along seam in present seam combine with gob gas drainage technology of buried pipe in The upper corner、high position boring、Surface borehole and buried pipe in gas tunnel，Then a large amount of pressure relief gas is drainage pertinently. Gas decreased by 70%,the volume of gas pumping recovery period reached 79.2 m3/min. And ensure the safety mining in first Mining Era of Thick and High Gas Seam.

Combining with the micro seismic monitoring data, this paper analyzed seismic signal in the process of the first mining face of Zhu Ji and showed that: 1, The micro seismic events are mainly distributed in the roof and located in front of the working face; 2, The seismic activity is closely related to the mining activities; 3, The influence of the mining stress can spread about 120 m in front of the working face ; 4, There are portents when the rock bursts is about to happen. First, the seismic frequency is at a relatively high value, while the seismic energy is relatively low at the previous day that the rock bursts happened. Second, seismic events have an obvious trend of development behind first mining face, and events after surface increase significantly until the occurrence of the dynamic phenomena.

In some factories, mining machinery and electrical equipment must be considered because of wrong phase sequence, causing the motor reversal will cause serious consequences, but the traditional phase protector for fault phase protection and phase state of a design problem incapable of action, protector, shaping the protector for three-phase incoming sampling, three respectively, to the logic of Fang Bo phase discrimination logic control unit, for the normal phase control unit generates a series of pulses LED light driven by a transistor, and LED encapsulated in the photosensitive resistance by light with the other switch tube bias and conduction, the contactor, electric motor starting operation; on the other hand, if the wrong sequence or lack of power phase indicator off, disconnect contactor, the motor stops rotating protection of personal property security. The protector can be made into a circuit module, at any time with any of a three-phase AC electromechanical equipment complete protection from work. Through the practical application of coal mine, the protector of flexible application, stable performance, high performance to price ratio.

Aiming at the mechanical features of stope in steeply inclined seam, the clamped beam model of roof subjected to non-uniform load is established, the stress characteristics of roof are obtained and the strata-pressure behavior in mining steeply inclined seam are analyzed in association with the motion features of overlying strata along the tilt direction. The results show that the maximum of compressive stress in steeply inclined stope locates the lower surface of the lower beam and its value is about 36% larger than the upper. The maximum tensile stress locates the upper surface of upper beam and its value is 26% larger than the lower. The non-uniform stress of beam and the rock characteristics of higher compressive resistance but lower tensile strength lead early failure in the upper roof and cause roof weighting. Considering the early failure of upper beam and dip angle of coal seam, the work face can be divided into solid filling zone, non-uniform filling zone and dynamic load zone. The structure of overlying strata in solid filling zone is mainly long cantilever beam supported by caved gangue, and its weighting intensity is the smallest of all zones. The dynamic load zone shows short cantilever beam structure, and the load of supports is usually smaller but larger at roof weighting, which shows obvious features of dynamic load. The monitoring results of supports’ working resistance verified the rationality of mechanical analysis of roof and the hypothesis about strata movement along inclination.

This article introduces a kind of ordinary Portland cement and calcium sulphoaluminate cement clinker, gypsum and lime as the main composite gas drainage hole sealing material,and has determined the characteristics such as expansion rate, inflation time, coagulation time and intensity and so on.The research indicated, develops the compound materials have certain expansibility, fast congeals early strongly, can satisfy the gas to pull out picks the drill hole note thick liquid seal the request. Make it not only has high density of cement material, but also with the expansion of the polyurethane materials performance, and low cost.

The FLAC5.02D numerical simulation software was used to study the effect of roof and floor strength on deformation characteristics of surrounding rock of deep gob-side entry retaining according to the geological conditions of No. 1115(1) working face in Guqiao coal mine, the Huainan coal mining area. The results showed that the deformation of roadway surrounding rock increases with the increase of mining depth when kept unchanged in size and shape of the roadway cross-section, method and strength of support, while the increase range of surrounding rock deformation is various under different roof and floor strength, the surrounding rock deformation of soft rock is more sensitive to the depth. With the increase of mining depth, the roof convergence with soft roof roadway is greater than that with hard roof, the displacement of floor heave with soft floor roadway is greater than that with hard floor, the filled wall convergence with hard roof roadway is higher than that with soft roof, the roadway’s coal side convergence is similar at different roof and floor strength. This conclusion can be validated by site measurement the surrounding rock deformation of gob-side entry retaining in two deep mines.

In order to study the effects of the crop yields and its components by waters in mining subsidence.Based on the field monitoring and laboratory analysis, this paper collected the crop samples from the different locations around the subsidence waters. The results showed that the waters change the characteristics of soil, and have significant impact on the plant height of maize at different locations and the dry matter weight of the aerial parts.During the elongation stage, tasseling stage, milk-ripe stage and full ripening stage, subsidence waters have significant impact on the plant height of maize at different locations and the dry matter weight of the aerial parts.Mining subsidence waters has significant impact on different locations’ maize yields and its component, with the increase of the distance from the waters, the impact on maize yields and its component is tended to decrease, all obviously lower than the control as well.Four meters away from subsidence waters, the yields of maize reduces for 100%.Four meters to six meters away from the waters, the maize yield is reduced by 60.47%,40.41% and 27.21% respectively.This study could provide the theoretical supporting to the reported loss of the cultivated land and the compensating of the damaged cultivated.

Pore structure of tectonically deformed coals in Zhuxianzhuang mine southern Huaibei coalfield was studied based on the mercury intrusion method. Menger sponge model was used to study the characteristics of seepage holes and diffusion holes. Results show that: Transformation effect to pore structure from tectonism weakens with the decrease of scale, with the gradual increase of coal deformation degree, macropore and mesopore pore volume increased significantly, transitional-pore pore volume increased to some extent, while micropore volume changes very little, pore structure becomes complicated; fractal dimension has good applicability to the study of tectonically deformed coals’ pore structure characteristics and deformation characteristics. With the increase of coal mass deformation, fractal dimension tended to increase; fractal dimension slowly increases in brittle deformation stage and sample fractal difference becomes larger, while fractal dimension significantly increases and sample fractal difference relative decrease in ductile deformation phase. With the increase of fractal dimension, pore volume and porosity index increase; pore volume ratio of seepage hole decreases negative index, pore volume of diffusion pore increases linear; seepage hole has a higher proportion when D＜3.1, the proportion of the diffusion hole pore volume gradually exceed seepage hole pore volume; Seepage channel increased, gas adsorption capacity strengths, coal reservoir permeability is often reduced.

In order to solve the problem of low rate of lump coal in mining face in Saimengteer, the paper uses comprehensive research methods such as laboratory test, numerical simulation and theoretical analysis to comprehensively analyze the influence degree of different damage extent on lump coal rate under geological conditions in Saimengteer. The paper uses fragmentation distribution and fractal dimension of fractal theory as the comprehensive performance index of coal, and studies the relationship between fragmentation distribution and fractal dimension after the destruction of forces with different properties. The index qualitatively reflects coal lump coal rate in coal mines to a certain extent, and determines key factors of mechanical properties affecting the lump coal rate. The results show that when coal sample is compression failure, fractal dimension is the largest, fragmentation distribution is wide, volume is small and fragmentation degree is highest. When coal sample is sheared, the fragmentation degree is lower than that in compression failure. As the shear angle decreases, fractal dimension is increasing, fragmentation distribution becomes more and fragmentation degree is higher. When coal sample is in tension, fractal dimension is the smallest, fragmentation distribution is the least, and fragmentation degree is the lowest.

In mechanized Excavation Faces of Coal and Rock cutting speed directly affects the efficiency of Tunneling, the safe operation of the driving machine is the fundamental to ensure the tunneling work. Taking coal mine geological conditions and coal seam characteristics as the starting point, the paper analyzes the stress situation of coal mining machine and coal body, taking the EBZ-132 type boring machine as an example, combined with linear regression analysis to carry out t test and F test, and get the best cutting speed and time; through the fault tree analysis of roadheader accident, the probability importance degree and structure importance and critical importance degree were analyzed and put forward reasonable measures.Through the practical research and application of the safety and efficiency of the driving machine, the results show that the method has a high theoretical and practical guidance to solve the problem of low efficiency.

In order to research the yieldable characteristics of U-steel support, both the theoretical analysis and laboratory tests were used to study the yieldable condition and law based on the mechanical characters of the overlapping part of the U-steel support, and its influencing factors were analyzed. The results show that: The contact force between U-steel supports decreases gradually from the clamp installing position to the two sides of the steel, the farther from the clamp installing position, the smaller the contact force; The yieldable process of U-steel can be divided into three stages, including elastic compression stage, small slippage stage and sliding stage. In small slippage stage ,U-steel mainly overcame the friction effect and small displacement is occurred. But a larger displacement is occurred in sliding stage with a smaller axial force changing. The steel’s anti yieldable capacity will increase with the increase of pre-tension, but decrease with the increase of distance between the clamp and the applying force part. In the filed applications, the anti yieldable capacity of U-steel support can be enhanced by increasing the torque of clamps, increasing the number of clamps near the applying part, and changing the installing position of clamps.

Abstract：Aiming at the problem of large amount of conductive interference produced by the use of mine explosion proof frequency converter, the method can be effectively suppressed by selecting appropriate grounding modes is proposed. And experiment proves that the accurate grounding mode can make the conductive interference of the mine used frequency converter no longer through the wire to the power grid or other equipment, reduce the effect of conduction interference.

In the images of mine shaft, there are many problems such as the low image contrast, the more image noises and the low efficiency of image segmentation accuracy. In order to solve these problems, we propose an improved active contour model based on image enhancement and regularization constraint. The image enhancement can improve the image contrast, expand the dynamic range of gray value, and reduce the noise effect. The regular constraints include the length constraint, the area constraint and the distance function constraint. They can reduce the influence of initial contour on the evolution of the curve, realize the contour curve to move quickly to the target boundary, and end up with the edge of the target. Experimental results show that the proposed model is superior to the C-V model and LBF model in the performance and segmentation results. This model can recognize the mine shaft diseases quickly and accurately, which can improve the degree of automation of mine shaft inspection.

Introduced the single structure three-product dense medium cyclone structural characteristics and working principle.On the basis of the single structure three-product dense medium cyclone theoretical studies, completion of the single structure three-product dense medium cyclone structure designed and exploratory research.The results showed: the single structure three product dense medium cyclone can achieve separation three different products in the single cylinder cone structural.However,The optimal structural parameters of the single structure three-product dense medium cyclone need to be researched.

Aiming at the limitation of coarse slime separation in traditional liquid solid fluidized bed, the authors proposed that improving density of separation medium by adding in heavy-medium, which can make the wide size materials based on density separation. Experimental study on coarse slime separation effect were carried out under different bed pressure and water velocity conditions in heavy medium liquid solid fluidized bed and the conventional liquid solid fluidized bed. The results showed that in the same rising water velocities and different bed pressure ,after adding the medium, the E value of the possible deviation can be decreased by 0.070 when the medium is not added, the quantity efficiency is increased by at least 4.43%, when the ash contents of the clean coal was required not over 10%, the clean coal production rate would be improved by 5.2%. Under the same bed layer pressure and different water velocity conditions, the E value of the possible deviation can be decreased by at least 0.030 after adding the medium, the quantity efficiency is increased by at least by 1.87%, when the ash contents of the clean coal was required not over 10%, the clean coal production rate would be improved by 1.79%. The sorting accuracy and the separation effect were significantly improved.

Abstract: A test apparatus with belt conveyor is developed for the main running resistance. When different idlers, vertical load, belt speed, style of belt are employed between the idler and belt, it can simulate the influence of different conditions on the main running resistance. As a result, it provides the references for reducing main running resistance and energy loss. What’s more, it is beneficial to measure the indentation rolling resistance indirectly.

To hole spraying and gas exceeding the limit in drilling through strata of strong outburst seam，it is better to weaken the strength of hole spraying and improve the length of passing through seam and hole rate of drill hole through strata by using the technology of drilling with casing. The paper introduced design requirements，structure and operation principle of the device according to the functional requirements of torque device，and the diameter of torque peg were calculated check. That the key contact area of the device was analyzed by Finite Element Analysis provided the basis for structural design and processing of the device. Finally, industrial test was carried out. The results showed torque device was designed to meet the requirements, reliable performance and easy operation.

Since most existing studies on the safety cost of coal companies are conducted with static methods, to overcome the associated limitations, a systematic dynamics model is developed in this paper to perform a dynamic and complete evaluation on the safety cost of coal companies. The composition and influencing factors of safety cost of coal companies are analyzed at first. Then, the systematic dynamics model for safety cost of coal companies is developed based on the mutual interactions of those factors. Finally, the model simulation is conducted with the dynamic modeling tool “vensim”, and the effectiveness of the model is validated by calibrating with historical data. Thus, the developed model can be applied in the practice, and the author believes it can provide useful references for improving the accuracy and objectiveness of budgeting and management of the safety cost of coal companies.

　　Based on the analysis of 138 cases of coal mine accidents in the past 5 years, triggering factors of coal mine accidents are systematically analyzed, and an improved HFACS model is built which is suitable for coal industry. In addition, grey correlation analysis is chosen to analyze triggering factors of the coal mine accidents, the degree of grey incidence to each factor is calculated, and the importance of the triggering factors of coal mine accidents is determined. The incidence order of the primary causes is illegal operation, illegal command, safety oversight, poor safety production supervision, lack of safety education and so on. And it is concluded that the manager is the most important human factor, In the end, the suggestion of safety production is put forward according to the analytical result.

Through studying and analyzing the causes and management situation of “three violation”, “four-mechanisms, six- previous and seven- cards” closed-loop prevention and control mode is established which based on four mechanism of prevention, control, reward and punishment and help education. Next, the article sets up recognized standards of “three violation” in coal mine, and studies systematically investigation and control techniques and methods of “three violation”, which provides a new conception to establish the long-term mechanism of the prevention and control of “three violation” in coal mine.