Abstract: Fold structures are often seen in the geological disasters construction of coal mine。 And we know that the fold is formed by the horizontal stress squeezing the rock strata ,.And in high-stress state there are a large number of elastic energy within the folds, so when we mined the fold, the original stress state of the fold is the destructed, which will inevitably lead to the occurrence of microseisms.And the rockburst and microseisms are always hand in hand. As a regional, real-time, dynamic monitoring tool, Micro-seismic monitoring technology for the prediction of rock burst and other geological disasters, disaster prevention and mitigation are entirely feasible. In this paper, combined with spectral waveform and the mechanical analysis to the fold,we study the activity patterns of the microseism which used the data monitored by the mine microseismic system when mining the fold.

Abstract: Reserchs have been made with experimental methodology on different concretes and epoxy resin grouting materials, in order to make better results to the adhesive of embedded pipe concrete crack.

The fault mechanism of VF61 frequency converter in coal shearer is analyzed and studied. The paper indicates that the main reasons of VF61 frequent converter fault are vibration, dampness and cooling. Detailed measures about vibration reducing, damp protection and cooling are presented based on interior structure, so that the fault rate of frequency converter could be reduced, and it could provide references for frequency converter fault servicing.

The system of frequency control constant pressure water supply mainly used in water plants, various types of production plants, a high-rise building water supply systems. The system is made up of PLC, VVVF, units of pumps and electromotor, pressure sensor and console. Because the effect is credible, stable, and energy saving, Frequency control water supply system which is designed by this paper has been applied to a lot of water supply systems.

Coal and gas outburst area elimination is the key to guarantee coal mine safety. A new measure, called hydraulic flushing, was described and studied in detail, and the mechanism of hydraulic flushing was put forward and analyzed. The in-situ experimental results showed that, while driving roadways with severe outburst proneness, not only the stress surrounding the strata but also the gas in coal seam was released efficiently and thoroughly after the new measure was taken, thus the airpermeability and drainage volume were increased dramatically, which has a potential effect to prevent and control coal and gas outbursts; The adoption of “3 step drainage” measure had prevented gas exceeding the limit, which guaranteed coal mine safety with much obvious economic and social benefits.

[Abstract] Through the analysis of the belleville spring in the ZDY650 drilling rig, a new kind of hydraulic chuck that used the cylindrical helical-coil spring instead of the Belleville spring was designed. Choose cylindrical helical-coil spring with rectangle cross section for this new king of hydraulic chuck. Stress analysis of the rectangle spring was done using ANSYS software to meet the design demand. With this configuration the reliability of the clamp was improved, the use demand was met, good impression was gained.

The increasing scarcity of oil resources led to the rising of new coal chemical industry that was embodied by producting of clean energy and alternative petrochemical products in China。However, water resources became one of the most important restraining factor of coal chemical industry because of shortage of water resources and uneven distribution of coal and water. This article put forward the solution for water resources in coal chemical industry, such as using water-saving techniques and technologies, improving the water and reuse of renewable technologies, zero draining of recirculated cooling water, openning up new surface water resourse and water right transfer,etc.

Based on hyperbolic Mohr strength criterion and the ultimate equilibrium principle, the ultimate pullout force of prestressed cable is studied. The ultimate pullout force of prestressed cable is related to the rock type, the shapes of rapture surface, grouting pressures and compressive strength of rock, etc. The results show that the grouting pressure increases, the ultimate pullout force of prestressed cable increases also. It can provide theoretical supports for some prestressed cable engineering practices

Abstract: Based on the factors influencing rock mass stability ,and information revealed by drilling, 51-72 Coal seam section rock mass stability was researched by using one-way analysis and Fuzzy Comprehensive Evaluation. The results indicate that block fracture and fragmention is the main structure, Medium development and comparative development of folding deformation degree is major，combined rock mass strength is between 30MPa and 45MPa accounting for more than 60%, Region of siltstone – mudstone dominates most of the 51-72 coal seam section. On the whole ,extremely unstable area and unstable area accounts for 65%,relative stable area accounts for 25%, stable area accounts for10%. The evaluation results agrees with the revealed the exposing situation,and supplys scientific basis for roadway's layout and choice of support patterns.

KingView is applied in coal mine monitoring system in this paper. The application protocol of CAN bus is developed and the data of environment and workers’ ID are collected and then stored in database if the data changes. Managers can realize data query through KingView.

The support of roadway in high stress area have become a complicated technique problem which restricts coal mine safety production in the process of deep mining. The 1070 transport tunnel of Weijiadi colliery had repaired for several times for the high stress and geological structure effect. It influenced safe service of the roadway for serious deformation and unstable state. This paper analyzes the source of high stress and failure characteristics and forming reasons of the 1070 transport tunnel. Based on the results of every test section broken zone, the combined repair scheme of bolt-mesh-anchor and bolt-grouting support is defined. Filed studies showed that repair scheme is reasonable, and the deformation is controlled in the allowable region after repairing.

The article has mainly studied current signal acquisition circuiof the mine explosion-proof and intrinsically safe type AC motor soft starter controller, carries on the high speed sampling to the soft start two side exchange signal, the electric current parameter which the use root-mean-square algorithm gain needs. The experiment proved that uses this sampling method, enhanced system's overall performance.

Abstract: for a short distance up the availability of thin seam mining machinery to carry out a comprehensive analysis of the demonstration, through on-site testing, the success of the upstream mining seams are summarized.

This paper designed and developed an integrated monitoring system in heading face，on-line monitoring of pressure air ducts and dust-proof water supply pipes and Mechanical and electrical equipment operational status such as safety parameters. The design of telephone transmission system fault detection and diagnosis of intelligent sub-station system can timely detect the line fault and deal with. System Monitoring software used the MCGS configuration software to achieve real-time parameter configuration displaying and remote communication.

To study the feature of the coal water slurry of the magnetic water, CWS is made of Jixi bituminous coal, magnetic water(distilled water, piped water and coking waste water)and it’s density is 60% , through orthogonal experimental method, test the water quality, magnetic time, magnetic intension on the performance of CWS. Find that the magnetic water is the most important factor, followed by the magnetic intensity and magnetic time is little, the best preparation condition is the distilled water, magnetic intensity for 0.547T, magnetic time for 10min.

The residual energy equation of pre-mixed abrasive water jet cutting was established based on energy analysis. By calculating the residual energy, energy that increased the temperature of fragments was obtained, which can be used to determine the safety of abrasive water jet cutting at coal mines. It also provides a theory basis for the application of abrasive water jet cutting at coal mines.

Abstract: On the basis of 9# coal seam’s 39713 working face condition of Bai Jiazhuang coal mine ,the article apply national advanced three-dimensional non-linear explicit finite-difference numerical simulation software FLAC3D , built numerical simulation model, study and analysis the macroscopical mechanical fields of working face ,entry and surrounding rock mass under remnant coal pillar, obtain the three-dimensional mechanical fields character ,collapse character ,distance changing character of working face and surrounding rack mass

Backfill mining has become one of the key technologies for green mining. Be coupled with the conditions of experimental area in Suncun mine, we developed a gangue paste-like filling technology, and analysed the optimal ratio of technical parameters about the combination filling materials, as well as researched the optimal order for adding to backfill material. The result show that using gangue paste-like fill technology in mine is feasible; the optimal ratio of technical parameters about the combination filling materials are that cement, mass ratio of fly coal ash and gangue is equal 1:4:15, mass concentration is 70% to 72%, addition quantity of water reducer is 1.0% to 1.5% of the total mass of cement and fly coal ash; the hydration reaction of cement, fly coal ash and gangue is a phased and multi-level process; the adding order of filling material is adding cement, fly coal ash and water reducer firstly, and then adding gangue according to the calibration proportion.

Based on the concept of water-preserved coal mining, this paper compared three kinds of mining methods, namely, limit the height of longwall mining, preserve the coal pillar of long wall mining, and "mining 12 preserving 8" strip mining. Then, this paper derived the economic exploitation program, and made numerical simulation studies on the stability of the program. In this way, this paper determined the rational exploitation program of DaLiangWan, and provided reference for economic exploitation study of Yuyang district.

Taking the 107th Large Section open-off cut bolt supporting project at Huangling the 2nd mine as engineering background, the method of equivalent ellipse was used in calculating lesion range of large-span rectangular coal roadway to determine the supporting parameters. Site monitoring results showed that, the effect of roadway support good, the calculating result of supporting parameters correct, the paper has provided new effective approach to large-span rectangular coal roadway support design。

Based on engineering fact，using three different methods as static load test，high strain test and low strain test to verify the integrality of the pressured PHC piles as working on soil ground and ultimate bearing capacity. Analysing and discussing problems existed in two aspects as construction and test，identifing reasons, giving ways of preventing and solving the problems，in order to determine and guide the construction quality accurately.

Based on geostatistics theory and relied on Surpac software, a three dimensional model of the coal ore body has been established in this paper. The space characteristics of stratum and space position of the ore body can be seen clearly by this model. With the model, the regionalized variables have been evaluated and optimized, reserves is calculated by ordinary kriging,. The case indicates that attribute of block can be detected flexibly, and the reserves of the coal ore body can be calculated quickly and exactly with the model.

Analysing the significance of coal mine dispatching drawing’s digitization, and then using geographic information system technology, through real-time data and spatial data engine, with monitor supervisory system on-line, builds a managing system for coal mine dispatching drawings, implements the visualized operation of coal mine production dispatching, security dispatching and other works. Describes the system design and implementation in detail, at the end of paper, an example about graphic process subsystem of the coal mine dispatching drawings system is presented.

Abstract: Briefly introduced the application of beam tube monitoring system for coal natural fire in fire prevention and extinguishment in underground coal mines, the text expound the existing problem such as the time-delay, choose of the marking gas and the lack of the judgment of the Spontaneous Combustion rank and support the corresponding solutions to make full use of beam tube monitoring system in the worksite.

70 %～90 % of mine hoisting accidents result from human errors. This paper emphasize on cognitive activities resulting in hoisting accidents, and analyze inherent logic of failure to cognitive activities through the research into inherent relevant course of human error occurance, which obtains root causes about human, technology and organization. At last it puts forward improvement and optimization aiming at root causes of one hoisting accident, which could effectly improve human reliability of mine hoisting system and reduce probability of human errors.

Abstract: The paper analyzed the connotation of coal enterprises informatization on the basis of concluding the conception of coal enterprises informatization. According to the principle of establishing the indicator, combined with the characteristic of the development of coal enterprises itself, build the informatization level indicators system of coal enterprises, introduced the method of using the analytic hierarchy process to determine the weights of every indicator, so it offers foundation to evaluate the informatization level indicators system of coal enterprises.

This paper describes 0.7m auger mining of coal seam shearer Application Practice, introduced the spiral drill coal mine in 8 the use of very thin coal seams, on-site mining problems of analysis and processing, and accumulated the successful exploitation of 0.7m around the experience of very thin coal seams. Effectively solve the thin and very thin coal seam mining safety problems and improve resource recovery rate of the thin seam mining under the same conditions, there is a certain significance.

The important work of outburst prevention is cross-measure cutting coal, while the craft of outburst prevention is to achieve its efficient and safe premise. based on cross-measure cutting coal characteristic of coal and gas outburst, the mechanism of preventing outburst during cross-measure cutting coal is analyzed from theoretically. according to the traditional insufficiency of cross-measure cutting coal technology, unifies the special details by the SongHe mine, proposed a set of comprehensive cross-measure cutting coal craft to prevent outburst, and has analyzed the application effect, achieved safely and fast to cut coal, have provided a good reference to the experience.