In order to study the adaptability of ZY8640/25.5/55 support in 6-2101working face, the control effect of setting load and yield load to roof, distribution laws of yield load and running characteristics were analyzed through filed observation. The result shows that the ZY8640/25.5/55 support are adaptable to 6-2 coal seam mining condition well and could meet the geological requirements. The conclusions provide practical experience to support selection and roof control in shallow coalface with large cutting height.

Based on the specific situation of 1-2 seam in Shangwan Coal Mine, the comprehensive demonstration of support intensity and work resistance 7 m Hydraulic Supports with Large Mining Height were recognized. Considering the influence of coal seam, roof, floor, hydrology, gas, temperature, humidity, altitude and so on, with laws of volume density, wilson estimates, experience estimates, on-site statistic and theories of short voussoir beam, step beam were, analysis and estimation were carried out, through comparison and optimization, quantitative relationship between Support center distance and work resistance were finally getted. It not only met the safety requirements of production, but also controlled top coal falling and reduced coal pressure.

Determination of locomotive speed is an important test parameter in the monitoring system of the Running locomotive under the coal mine,. This paper is based on the site status that acquired by the Camera which is installed on the locomotive, analyzing the video image sequence, a template matching method based on the images is used to get the locomotive speed. By the methods of ranging techniques to obtain the locomotive moving distance, according to the number of frames extracted from the image for locomotive running time intervals, the last formula is calculated by the speed locomotive speed. The effective monitoring of Locomotive speed can reduce the occurrence of transport accidents in the coal mine and increase the production of coal.

order to reduce the 10kV power distribution network switching and reactive power compensation capacitor of switch transient over-voltage on the harm caused by electrical equipment, introduced a DSP-based synchronization technology used switching reactive power compensation capacitor control device. The installation to a digital signal processor (DSP) core, TMS320LF2812 voltage, current, real-time synchronous sampling, extraction of three-phase voltage and current of zero, the control of synchronous vacuum circuit breaker in the realization of compensation capacitor voltage zero inputs, in the current zero, effectively reducing the capacitor when inrush and over-voltage traditional reactive power compensation equipment.

Along with the continuous development of socialist construction, our land increasingly tense and effective. To this end, the planning and design in general plan to take active measures to conserve every inch of land

Build a mathematical model based on the kinetic equation of a particle on the spiral chute, Find out the key variable as the parameters of the spiral chute were determined is the acceleration of the particle. Taking the parameters of the import segment and the standard segment as known conditions, make the change rule of the acceleration in the non-standard segment as linear function、quadratic function and elliptic equation, get the key parameters of the spiral chute, then analyze and compare the three kind of methods in the end.

Abstract: Taking Shanxi ZhaoZhuang Jincoal group limited liability company Xifan vertical shaft antifreeze and supporting project for example. According to the and< the coal industry primer interpretations mine design rules> (2005 edition) regulation, the conditions of Special into wind Wells was discussed. For the dry air at the southeast of Sanxi and the absence of the special into wind Wells personnel, there’s no necessity of heating facilities for wellbore antifreeze from the point of safety and technology.

Bolt-grouting reinforcement technology can significantly improve the surrounding rock stress state and enhance the overall carrying capacity of roadways, roadway deformation and failure to effectively control, to improve roadway stability and security. Based on that Weijiadi coal mine second cross-cut transport roadway to repeated repair, tunnel deformation is still a serious problem, the use of Bolt-grouting reinforcement theory and technique to research Broken expand soft rock with the High geo-stress bolting and grouting supporting parameters, the results show that a significant support effect, and achieved a good technical and economic benefits.

Abstract: in order to prolong the fully-mechanized face toward the length, achieve high yield and high efficiency, renlou coal mine by Yang inclined broken top coal, adjusting mining for pseudo inclined reduce expose fault plane number, control bracket and conveyor state a series of measures, success through divide 8 m tendency of faults and have achieved good economic benefits, and for the fully-mechanized face fast through fault accumulated experience.

Based upon water prospecting and drainage in initial LW in Guotun Mine, the research has been conducted succeccfully via geophysical prospecting, drilling design, controlled drainage and result of actual test. This paper summarized and enriched water prospecting and drainage technology in LW face in deep coal mines. It is good experience for mining sequence and safety production in mines.

The poor sealing borehole is one of important hidden troubles that affect safety production of mine. There are many poor sealing boreholes in Zhaogu No.2 coal mine. In order to avoid the poor sealing boreholes becoming conductor and forming water-inrush, the plugging technology of underground mine was adopted to reinforce borehole. The hydro-geological conditions was analyzed and the borehole structure was designed. The plugging technology was made and the duplex fixed pipe structure was put forward. The production practice shows that the plugging reached expected requirement and the working face realized safety production. The results have certain value and significance to the grouting technology.

Abstract: This paper, in order to eliminate the high gas ,low permeability and poor effect of gas drainage in xin yi mine,this paper, used hydraulic flushing and detailed the protrusion-dispelling mechanism and technological process of it . The results showed that, after the hydraulic flushing, in the same condition of the drill holes’ number, effectively improved the utilization of the drill holes’ and significantly lowed the methane content below the critical value of outburst. At the same time, the effect of gas extraction was up more than 50%, and the permeability had almost larged 10 times than before, three indicators: the drilling cutting quantity S, the initial velocity of gas emission from the borehole q, the drilling cuttings desorption index △h2, was not in excess of the standards. It provided a guarantee for the mine safety.

Abstract: For the determination of advancing abutment pressure in the coal-mining face, the seismic CT technology is applied. According to the comparison between the actual site conditions, undergrond pressure rule and velocity CT image, the reliability of detection conclusions are proved. It provides a new way for the research of undergrond pressure rule in coal-mining face.

Xin Li Mining Area of Qi Taihe has the features of thin seam, low permeability, the low coefficient of coal sturdiness and the high gas content. Coal seams have the character of subgroups and at the same time the coal seam distance is small in every subgroup. We advanced the high-flat-seam drilling of gas extraction and built the system of simultaneous extraction of coal and gas of close-quarter thin seams of Xin Li Mining Area to solve the problems of the high gas emission of the adjacent seams, the difficult construcion of drilling of cis layers, the bad effect of the extraction and the over-limited gas concentraction of the upper corner at mining face and the return current. We studied and applied all those mentioned above in Xin Li Mining Area. On the basis of analyzing the theory of gas extraction of the adjacent seams, we calculated that the height of the area of dropping stones of goaf was 6-8m and the height of the crack area was 18-20m by using the software of UDEC4.0 numerical simulation. According to the results of the extraction, we got the conclusion that the control of gas by high roof drilling of gas extraction could get better effect, the gas volume fraction of upper corner was below 0.8%, the gas volume fration of drilling could be above 55% and the quantity of the extraction could be above 50m3/min. Therefore, it could achieve the high-efficiency simultaneous extraction of coal and gas.

As 11041 working face was a coal and gas outburst face,a comprehensive gas drainage with in-seam intensive boreholes was adopted as outburst elimination technology in this working face,the borehole drilling length of gas drainage per ton of coal mining was over 0.16m/t,the drainage gas effeciency from virgin coal seam was up to 34.72％,the remained gas content before the mining operation was obviously lower than the critical value of it.The unite index method, comprehensive index method and the remained gas content method,the borehole drilling length of gas drainage per ton of coal mining and the drainage gas effeciency from virgin coal seam were applied to the evaluation of the outburst dangerous before the mining operation,the conclusion of the evaluation was that there would be no outburst danger, therefore this provided important and scientific evidences for taking safety technical measures to the working process.

Abstract: This paper expounds the harm of coal-dust of the Mine in detail and uses the negative pressure induction removal technology to make an effective coal-dust management for the 1250 coalface in the mine of Suhaitu.At the same time,it introduces the working principle of this technology in detail.By place the pressure induction removal spray and the determination of its effects,the practice proves that the technology achieve the expected effect of dedusting and ensures the the safe production of the mining face.

Aiming at the problem that soft rock roadway deformation was serious in oil shale ascending mining in Beizao coal mine. It analyzed the stress state and deformation law of 1st coal seam and 2ed oil shale seam when 2ed coal seam mined with UDEC numerical simulation software. The integrity of 1st coal seam and 2ed oil shale seam took significant plastic damage and tensile failure in the scope corresponding to between 20m front and 30m behind of the working face in 2ed coal seam. Through the monitoring and analysis of the roadways’ rock deformation, obtained the soft rock deformation characteristics: roadways compressed in ring and non-symmetrical, the apparent scope of ahead support pressure was about 30m. Proposed soft rock roadways’ technology schemes in mining area.

There are differences between steeply inclined thick coal seam short wall combined-mining face and general long-wall combined-mining face in strata-pressure behavior. Aiming at the special geological and technical conditions of inclined thick coal seam short wall mining in Mu Chengjian colliery, on the basis of extensively investigation and field easurement, applying of theoretical analysis and numerical calculation methods, this paper systematically explores the strata-pressure behavior of difficult-to-mine complex thick coal seam mining face, determines the rational working resistance of support and the distance of advanced support in steeply inclined thick coal seam short wall mining face. And analyses the effect of site application, provides engineering practice technical basis for the similar mining of steeply inclined thick coal seam.

According to the accident of rock bust in Xinxing coal mine, the geological conditions is analyzed in order to define the influencing factors. Countering the unusal method of mining that the coal pillars are set along the gob-side entries, numerical simulation is used to definite immediate cause of rock bust. Base on the studying above, practical solutions are proposed in the paper.

According to the problem of mass fully mechanized mining supporters remove in several days under the condition of the small angle between the working face and the railway. Firstly we propose three schemes and make the scheme comparison. Then we bring up rational working face support measure. Finally the unnecessary are successfully removed under the condition of safety and normally mining. Additionally the technology is first applied in china. So the technology creates enormous economic and social benefits.

Based on the analysis of the geological and mining characteristics of the gobs by taking the key project of Chongqing to Wuxi-Fengjie freeway as the research object, the stability of surrounding rock of the tunnel crossing the gob is analyzed and evaluated by the ways of quantitative and qualitative analysis. Meanwhile, according to the space position between the tunnel and the gob when the tunne passing through the gob，the effect of the tunnel stability coursed by the gobs is studied by numerical simulation, which provides certain theory basis for Xikouchi tunnel’s safe construction.

The overlying strata division of working face has the great significance. The existing research on the roof division based on the mining height and the judge to the loose coefficient, but has been proved has some limitations in the extracting tallest once of thick coal seams. Compared with the traditional mining overall height of thick coal seam method, the stagger arrangement roadway layout mining overall height of thick coal seam method has essentially different. According to the analogous simulation and theoretical analysis, the thickness of immediate roof will increase significantly as the stagger arrangement roadway layout mining connection face advanced, it will be the demarcation point when it get at the stable strata of the first face. Base on the definition and characteristics of immediate roof and main roof, using the elastic thin plate theory and the key stratum theory to analysis and summarize the analogous simulation phenomenon, the thesis will give a division and classification to the roof of stagger arrangement roadway layout mining overall height of thick coal seam connection face. Comprehensive analysis the all factors, what cause the fracture and collapse of main roof, the relationship between the characteristics of ground pressure of main roof with the length of face and other factors will be found. It will provide certain theoretical basis for the actual production.

Based on analysis of rockburst hazard factors for roadway groups, according to the possible rockburst hazards happened in the process of roadway groups excavating, the paper adopted the method of numerical simulation to research on the influence of roadway deformation-broken mode by different pillar’s widths during roadway groups being excavated by steps, which obtained that roadway groups excavation caused the stress superposition around the roadway surrounding rock, and this phenomenon appeared more obvious with the same pillar’s width. The corresponding peak of sides abutment pressure and the peak position increased along with the roadway groups excavating,what’s more, the influence scope of abutment pressure transferred to the roadway surrounding rock near the roadway groups along with decrease of coal pillar width, which had greatly guiding significance to forecast the rockburst hazards of roadway groups reasonably.

Through high-stress soft rock specimens Anchorage coupled laboratory tests，Stiffness coupled with theoretical analysis，Found the support structure can be achieved andSpace surrounding the specimen stiffness of the coupling coupling，and in the field of applied and achieved a good supporting effect。

A mathematical model calculating the temperature distribution of the surrounding rock and cooled zone radius, and a semi-explicit difference scheme that was better than general difference scheme was established. A program is coded to calculating the temperature distribution of the surrounding rock and cooled zone radius. The temperature distribution of the surrounding rock was obtained. The correctness and precision of the semi-explicit difference scheme was proved through contrast between Solution value and measurement value.

Reservoir pressure is a major factor influencing gas output, and it is beneficial to study its spread regularity in the process of coalbed methane (CBM) drainage. Based on the CBM drainage mechanism, this paper analyses the spread regularity under the different boundary conditions and drainage technologies. The results show that for different boundary conditions and drainage technologies, the pressure-drop curves are different, and there are two stages in the process of pressure transmission, while the diverse stages are decide by the time when pressure transmits to the reservoir boundary.

Basing on the research of SVC’s principle, the article discusses and compares kinds of testing method which base on the instantaneous reactive power theory. And we use MATLAB/SIMUINK to do comparison and simulation on these methods. The experiments reflect the effect of the SVC, and verify that it’s remarkable and effective of reactive power compensation which bases on the principle balance of C P.Steinmetz.

Abstract: The article analysised the slime of Kailuan，and the result was that slime there was fine high-ash and refractory. In order to solve bad effect of floatation mineralization of the slime there, we tried to research floatation mineralization effect by adjusting agitation speed, pulp consistency and agitation time. Then though orthogonal test, we found the best conditions of mineralizing of slurry. The experimental result showed that when rotational speed was 1950r/min and stirring time was 4min, flotation effect was very good, yield of clean coal increased about 6%, ash decreased about 2%. Then we found the primary and secondary relation among the three factors. It is of guiding significance to the slime separation there.

In view of the current situation that the wash ability of the increasing fine coal is getting worse, the flotability of high ash, difficult-to-float fine coal from Tangshan Hebe was investigated through phase analysis, grain size analysis and density analysis. Carried out the flotation tests research of join Sodium hexametaphosphate, sodium silicate, the CMC and sodium hydroxide with different dosage conditioning agent, and the action mechanism of conditioning agent and the test results were analyzed as well. Studies show that adding conditioning agent can effectively improve the flotation effect, when the CMC dosage is 40g/t for the coal slurry flotation, the result of flotation is best.

Abstract: A numerical model of particle settlement in a settlement separator for coal slurry was established, through which a particle sedimentation time of 63 seconds was obtained. Then a series of flocculation experiments were conducted to study the effect of sedimentation time on settlement performance. The results show that a length of sedimentation time of 60 seconds is reasonable and it is meaningless to have a longer one.

As the main form of mining resources outward transport, railway transportation assumes a large number of coal transport task, the heavy work load and the complex work link make the railway vehicles subject to damage extremely. The paper made related research about three factors of “Man-machine-environment” by used method of system engineering, base on the practical data, analyzed various kinds of reasons which caused the damage of railway vehicles, construct hierarchical model combine with Analytic Hierarchy Process(AHP), analyzed and calculated each factors, obtains the weight value, then gave targeted suggestions base on the date result. The Research Results do great practical significant to protect the vehicles, save the production cost, and ensure working safety.

Abstract：Zunyi area is one of important coal production bases in Guizhou with stacking large amount of coal gangue, lower utilization rate and single utilization ways, which makes it a typically area with coal gangue hazard and resource waste coexistence. Coal gangue from four coal mines, which is Zunyi coal mine, Tongzi coal mine, Panshui coal mine and Fenggang coal mine, in the study area was analyzed by X-ray diffraction, and the mineral composition and its change rule of coal gangue was preliminary found out. The results show that in the study area the mineral composition of coal gangue is significantly controlled by the rock type of coal-bearing strata and contains large amount of clay minerals and a certain amount anatase. The content of clay minerals is influenced by rock type, weathering action, stacking position and stacking time, but anatase has little influence on weathering action and is easy to separate, which also is the occurrence mineral of many high value elements, such as rare elements, rare earth elements, noble metal and so on in coal gangue, therefore, great attention should be paid to it during comprehensive utilization of coal gangue, especially during higher end comprehensive utilization.

Sand coated by fly-ash is a newly agitate technology, this study briefly introduce the role mechanism of sand coated by fly-ash, mainly focused on the frost-resistance capability of sand coated by fly-ash on the concrete. Results show：comparing with conventional method, the silica fume concrete mechanic performance increase about 5%-20%,on the premise of not changing the machinery equipment, not increasing the labor and material. At the same time, the method sand coated by fly-ash greatly enhancing impermeability of concrete, the coagulation materials response and the mixture work-ability.

Abstract: Based on truss structure system, three programs of knee braced structure with viscoelastic dampers is adopted and analyzed by elastoplastic seismic time-history analysis with using finite element analysis software SAP2000 and the two calculate achievement of dynamic characteristics analysis and seismic response is specified.The consequence indicate that the natural vibration period of knee braced structure with VED change unconspicuously,but the regulation of top floor’s maximum displacement and base shear is conspicuous.

Abstract: In recent years,belt conveyor with large dip angle 、long distance,and heavy load is widely used in coal mine.however broken belt accidents occur frequently,caused great threat to coal mine safety.There are many types of protection device for broken belt in belt conveyor. With poor anti-interference, reliability need to be further improved. A kind of purely mechanical differential sensing device for broken belt is studied in this paper. Occurrence of broken belt can be detected effectively and incidents can be avoided.

Heat harm in deep mine is harmful to human health. Individual protection system using cool wind for heat harm of mine was designed by calculating and experimental method taking the Xuzhou-jiahe coal mine,Jiangsu,China,as a case,and the practical effect and economic analysis of the Individual protection system were researched. The results show that the individual protection system using cool wind for heat harm of mine Can reduce the temperature of skin's surface 13-15 ℃ and make the heart rate down 40-64 b/min, effectively improve the working environment, increase comfort of worker’s body; the system’s economy is better than large air conditioning system, investment is only one in twenty-five of the air condition system and the operating costs is one in sixteen of it; The individual protection system is intrinsically safe according with mine explosion-proof .

According to the characteristics of mine emergency rescue, mine emergency rescue made the role of multimedia command system, system components and work principles. From Safety Ergonomics point of view of ergonomics design of the system equipment, scientific equipment, monitors the system for human-machine interface design. When the mine emergency rescue environment is particularly complex, on-site conditions are very poor, so the redundancy of the system and equipment is analyzed and based on the principles of ergonomics on the safety equipment, to make the system truly essential safety equipment reliability, better For mine rescue personnel services, while enhancing our mine rescue communication equipment and the full realization of digital technology to provide technical support to mine.

The extraction of landscape information is quickly and easily with remote sensing images and has been widely applied. There are many extraction methods, various methods have different features and different precision. Five classification methods were selected in order to classify the four phase remote sensing images. Analysis and comparison of the classification results aims to identify suitable landscape information extraction method for the specific conditions of the XuZhou city.

With a rang of problems , such as poor stablity and real-time, short of open network， existing in Monitoring and Controlling System of Comprehensive Gas Drainage currently，based on technology of OPC and industrial enternet ，the paper proposes a new type about remote Monitoring and Controlling System of Comprehensive Gas Drainage. system takes S7-200 PLC as main controller, uses Simentic net software to develope OPC Server , uses VB6.0 for OPC Client, the OPC Client accesses the OPC Server by the manner of Industrial Ethernet, which achieves real-time and reliable remote monitoring to drainage situation .

This paper is meant to make an inquiry into the concepts of Investment Control, Constitution of Project Valuation, and Construction Cost that are involved in the investment of constructive projects. The analysis will be carried out from such different angles as implementation stages, implementation subject, and implementation criterion and aim. The paper finally points out the difference and connection between these concepts, and also offers some suggestions on how they are used in the related textbooks.