Abstract：In allusion to the practical situation that the mine strata pressure and surrounding rock deformation are serious in mining roadways of three-soft coal seam in Zheng Zhou mining area, repeatedly repair is required to meet the request of production safety. This paper proposes the principle that releasing the load firstly and than implementing secondary advance reinforcement. This paper systematically elaborates three types of reinforcement technology for mining roadways of U-steel，which is three beems reinforcement，assist beem reinforcement and I-beem combined support method，their advantages and disadvantages as well as applicable conditions are discussed. Practice shows that:the application of advance support and reinforcement technology can reduce the labor intensity and repair investment,the safety of product propress is ensured as well.

Through syneresis rate and uniaxial compressive test, the paper studied the grout ratio that the main experimental materials were PO42.5 ordinary portland cement and superfine cement in different water cement ratio and bentonite proportion, and the grouting experiment of destructive mudstone specimens using independent development MYZJ-2 hydraulic pressure grouting system, analyzed the grouting effect. The results showed that superfine cement grout with water cement ratio 1：0.6 and bentonite in 4% of cement weight which the syneresis rate was 6% and uniaxial compressive strength after curing 28d was 8.87MPa met the requirements of lab grouting to destructive specimens with standard size. After grouting reinforcement of destructive mudstone specimens in triaxial compression test by ratio optimized grout, the uniaxial compressive strength recovery value was the 14.7% of original uniaxial compressive strength. The grouting effect was better.

In view of the problem of large random in the key design of the vertical shaft ladder roadway in current coal mine ，such as horizontal layout, layer selection and so on , making sure the advantages ,disadvantages and applicable condition by analyzing, and bringing forward the improved measures for the details which in the design of the current coal mine shaft ladder roadway, that provides some useful reference for the design of coal mine shaft ladder roadway.

In order to determine the rational width of coal pillar of the NO.8215 coalface with fully mechanized top coal caving，the theoretical calculation and numerical simulation analysis were applied to determine the width of coal pillar．The rational width of coal pillar was 6.57 m to 7.67 m through the theoretical calculation，six kinds of width design scheme were proposed，and the UDEC software was adopted to analysize the surrounding rock’s deformation effect．When the coal pillar′s width was 6 m to 7 m，the relative distortion between roof and floor was 480 mm to 500 mm，and the relative deformation of two sides was 380 mm to 420mm，and the value of the vertical stress in the centre of the pillar was 13.08 MPa to 14.11 MPa，and the peak of vertical stress of the floor under the coal pillar was 18.6 MPa to 21.1 MPa．The width of coal pillar was 8 m at the scene，the relative distortion between roof and floor was 220 mm to 460 mm，and the relative deformation of two sides was 340 mm to 620mm，the separation amount were 0.3~7.4mm and 0.3~8.6mm in the roof of the roadway．The project application effect indicated that the width of the coal pillar was reasonable，and the satisfactory technical and economic effects were obtained．

Based on the geological feature of the 22202 large mining height fully-mechanized face in the Shendong mining area DAliuta Coal Mine equipment remove channel, using FLAC 3D numerical simulation technology，we obtain results that the 12 overlying the coal mined-out area has no effect on the face. According to the mining geological conditions and the measured strata behavior regulavity of the face, we costruct roof structure model of the equipment remove area, and export the active support strength of stents, on the basis of it, calculating the reference value of chock support working resistance is 9998kN。Considering the differences of the roof structure, we suggest that the used chock support working resistance is 11000kN。The measured rib spalling of equipment remove gateway in 22202working face is slight, no roof fall, and both the roof-to-floor convergence and the roadway’s sides convergence is very small, so the roof control effect is good.

A remote monitoring system for Air Compressors is designed based on OPC and LabVIEW by using PLC to achieve the requirement of unattended system in a coal mine of ShanXi, besides, the data is transferred to control center through the industrial ring network, publishing by Web, so as to realize remote monitoring. The field application has shown that the designed system is stable and reliable, which achieves the unattended system, and it has improved the information management and automation level in coal mine.

Fully-mechanized mining with large mining height positively ensures the security, efficiency and large-scale of the mines in China. Increasing the operation rate is considered as a reliable means to improve the coal production and efficiency. The geological condition and equipment in 8101 mining face are introduced in this paper. By analyzing the operating time of the shearer, the daily and team operation rate are calculated respectively and the factors which restrict the production and efficiency of 8101 mining face are found. As a result of it, the improvement measures for increasing the operation rate are proposed from the aspect of people, machine and work condition. These measures would help to improve the production and efficiency of fully-mechanized mining face with large mining face.

According XV1301 mechanized mining face parallel double U-ventilated actual site conditions in SiHe. The hydrodynamic model are established to simulate the comparative analysis of the main intake airway if XV13013 case of constant air volume ratio XV13011 different auxiliary inlet Lane XV13015 another intake air flow and air flow lane on the flow field and goaf gas migration characteristics. Studies have shown that parallel double U-ventilation, if XV13011 auxiliary inlet air volume and XV13015 another lane into the wind air volume ratio of 3:1, Alley, can significantly reduce the upward corner gob centralized air leakage, which can effectively alleviate the upper corner and the main return airway gas accumulation phenomenon. This study is the ratio of gas and air flow control optimization theory.

Abstract: Based on the surface of steep coal seam mining may cause cracks and steps, collapse pits or collapse basins, etc, this paper propose the prevention and control technical measures, such as, coal seam outcrop governance, underground tunnel governance and pillar reinforcement, etc. The results show that the prevention and control technical measures can reduce the damage to the influence of the surface of steep coal seam mining, effectively prevent the occurrence of mine flooding accident, in order to provide the ideas and methods to solve the similar problems.

According to the characteristics of the coal enterprise production management, this paper puts resources into reusable resource and consumable resource and designs a coal ERP system that allocates resource with the time dimension based on real-time monitoring to all reusable resources in enterprise. And this paper puts forward a coal ERP framework including seven modules: master production plan management, bill of resource management, reusable resources management, and consumable resource management and so on. The coal ERP system which divides all resources into reusable resources and consumable resources and allocates resources in time dimension has reference significance to the traditional ERP theory innovation.

Abstract: The traditional way of delivery model restricts the effectiveness of organizational communication, influences the success of the project. This paper states the fundamental concepts and characteristics of IPD, for the particularities and problems of project organizational communication management, analyzes the information needs of the parties on the basis of the Stakeholders Theory, and then build the communication management model of all parties, at the last, proposes the key control elements under the IPD. This research has a positive side in guiding the theoretical and practical application of the related studies.

The intelligent emulsion pump station control system was achieved based on CAN-bus. Centred on PLC and human computer interface was accomplished by CAN-bus and upper computer, Communication with the combined switch box control the intelligent emulsion pump station, which was monitored by on line monitoring system. The control strategy and hardware design scheme were described and was proved good reliable, steady and high automation via applied underground coal line.

The use of slewing bearing on an articulated rubber-tyred vehicle can induce horizontal rotate between front and rear frame, make four wheel touchdown, and improve attachment condition of wheels for formidable work environment of underground coal mining. In the article, firstly, horizontal rotate structure of slewing bearing is presented, secondly, basing on theoretical mechanics and associating work condition, the force of whole vehicle and rear frame are analyzed individually, axial load and overturning moment of the slewing bearing are calculated, finally, specification of the slewing bearing product is defined according to the bearing capacity curve.

Abstract: With the increasing of coal mining depth, coal and rock dynamic disasters are getting worse. Therefore, researching for dynamic instability of coal disasters and developing systemic accurate forecasting method are very significant. Based on the uniaxial compression tests associated with the Acoustic Emission(AE) for the coal samples, the data of the stress, strain and AE parameters are available. It is indicated that the changes of the AE parameters in the processes of the deformation of the coal samples, which mean that both the accumulation of AE counts and AE energy with time, are important to the forewarn of the coal destruction. Also the data collected by different AE sensors on the coal samples surface are compared, which show more information about the characteristics of the forewarning messages before coal samples destruction. The conclusion in this paper is significant for the in-situ coal disasters causing by dynamic instability.

In order to study on the mine strata pressure law under thick alluvium, taking the determination of high cutting fully mechanized coal mining face in the second panel of Tingnan Coal Mine as the engineering background, theoretical calculation and field measurement had been used. The results showed that the effects of thick alluvium were lagged: Because of tend to forming arch, the clay in thick alluvium had little influence on the roof strata control of mining face in a certain distance. With the mining face advancing, subsidence and fracture would occur in the key strata of C19 and the stability of the alluvium would be damaged, the alluvium load would transfer to working face through the rock stratum. When the mining face advanced to more than 198.5m, the work resistance of powered support and dynamic load factor had become higher, the pressurized distance had become shorter, and the pressure strength would increase periodically at this stage. Work resistance of powered support at the later stage was higher than the previous stage during the non pressured period. The work resistance at the middle part of the coal mining face was higher than at two ends, and the work resistance near talgate was higher than near the other gateroad.

To determine rockburst influence factors and influence degree scientifically, and then study targeted stronger rock-burst prevention and control measures, use fault tree analysis method to analysis rock-burst influencing factors qualitatively, use Boolean algebra method to calculate the influence degree of various factors, and divide rock-burst influence factors into three grades, propose "weaken Coal and rock burst hazard; pre-assessment, comprehensive monitoring and dynamic control; strengthening management and mining optimization" three rock-burst control countermeasures. Practice proved that the effect is fine, the research has a strong theoretical and practical guiding significance to the prevention and control of rock-burst.

Boom - type roadheader intelligent control technology applied to cutting having great significance with development and mechanized excavation of comprehensive tunneling technology. On the basis of the development process and content reviewed of intelligence cutting control related technology both in domestic and overseas, describes the key technologies impacting of cutting of intelligent control technology development including positioning guide and adaptive tunneling machine cutting. By researching the implement method and analyzing advantages and difficulties of these key technologies, provide a useful reference for the boring machine intelligence implementations.

A novel dual active bridge (DBA) bidirectional DC-DC converter with LCC resonant net was proposed. The converter was composed of LCC resonant net and traditional bidirectional DC-DC circuit with zero voltage switching (ZVS) operation of the primary side switches and zero current switching (ZCS) operation of the rectifier diodes in forward power transition. This paper analyzed the buck operation mode in the reverse direction. The simulation and experimental results illustrates that the proposed topology can realize the power transition in both directions and the switches can be turned ON and OFF in ZVS and ZCS.

In China low permeability high gas coal are universal existence, In order to improve the permeability coefficient of the coal and achieve the purpose of increase gas pumping. The orifice blasting presplitting techniques were used in ShangShe 15103 coal face. By field test and contrast test, the effectiveness of the orifice blasting presplitting techniques to increase gas pumping has been verified. And by adding damping device to burst test, the shock wave generated by blasting has reduced, at the same time weakened the damaging effects of shock waves on the coal wall at edge of the hole, which not only optimized the blasting process, but also satisfied the practical needs of increase pumping gas. The results show that when loading dose of level 3 emulsion explosive filled in the hole were 0.8-1kg, by adding protective barrel at the orifices in bursting test, after the test, compared with the original value the gas drainage improved sharply. drainage negative pressure declined, both the volume and the pure gas drainage volume substantial increased, The gas density also boosted, drainage radius increased from 1.5m to 3m, the effect of gas drainage was evident. Provided support in using orifice blasting techniques to increase gas pumping in coal mine.

In order to study blasting seismic wave propagation characteristics in a single coal seam under the high stress and impact properties,and the seismic signal test was carried out of coal unloading blasting using YDD16, and the collected signals in time domain and frequency domain was analysised. Coal and rock abstract into Maxwell viscoelastic body, and seismic wave propagation characteristics in the viscoelastic body Maxwell was deduced. The experimental results show that: seismic dominant frequency decrease with the increase of propagation distance present power level; In single coal seam, the main reasons of seismic wave amplitude attenuation coefficient decreases are the seismic dominant frequency and there is a good positive correlation relationship with the main frequency. Seismic wave amplitude attenuation rule in y=ax3+bx2+cx+d, and present the phenomenon of a more obvious attenuation rate that increase after the first reduce.

This paper introduces the basic structures and the necessity of researching cyclone with high separation density, through the coal test with filling pressure, slurry density and suspension slurry conten those operating parameters, it is concluded that low density slurry can realizes high density separation.

The article focuses on the method of using VB 6.0 on AutoCAD secondary development, and through an software instance of Pillarless sublevel caving digital generation system elaborates the process of using VB 6.0 on AutoCAD secondary development. This software can well solve the problems in the realization of mining methods graph in Pillarless sublevel caving and make the realization process automatically done to achieve satisfactory results.

Shendong Group coal mining goods before loading using laser scanning technology for vehicle residual volume object detection; using visible light camera, shooting video material vehicle, according to the object texture, color discrimination material types; same time, the use of cameras the side of the train shooting video, carried by train number recognition. Through these three technical methods to complete each section at the bottom of the trunk residual material volume calculations and material identification, improve loading efficiency of coal and other materials.

During big development of fully mechanized coalmining equipment these years, The flow rate of safety-valve has reached 1000L/min. A simulation model for the test of Large flow safety-valve based on STA-1000 test equipment and AMESim has been built. The difference of flow rate-time curve is less than 5%, comparing with real test result. At the same time, models with different inner diameter, elastic coefficient of spring and spool mass has been built, and the relationship between these parameters and flow rate-time curve has been studied. The result shows that small inner diameter causing shock, increasing of elastic coefficient of spring reducing the flow rate after opening and no efficient caused by spool mass.

Freezing experiments of remolded clay are made for further study on frost heave characteristics of artificial frozen clay under unidirectional and bidrectional freezing modes and unidirectional condition with a certain amount of headspace separately. The results show that the variations of frost heave force with time are identical under unidirectional and bidrectional freezing modes, but the start time of frost heave under bidrectional freezing mode is slightly earlier than that under unidrectional freezing mode, and the increment speed of frost heave force of bidrectional freezing mode is faster than that of unidrectional freezing mode during the rapid growth stage of frost heave. The frost heave force of the two modes, whose deviations are basically the same at the same temperature, increases nonlinearly with the decline of temperature. The variations of temperature at measuring points and freezing front with time are both symmertrical along the longitudinal of a soil sample under bidrectional freezing mode, and the development rate of freezing front is three times faster than that under unidirectional mode. It is practical for the freezing test with headspace under unidirectional mode in that the relationship between frost heave force and amount of frost heave could be got directly. These findings are useful for the design and construction of multi-coil piple freezing method and further study of frost heave model.

Under the engineering background of NO.11 coal seam entry tunneling in Pingshuo mining area, the complete technology in roadway supporting and its practice experiments under the gob of close coal seams were described in detail. Based on the results of geo-mechanics test, anchor tests in roadway surroundings, theory analysis of bolting support in NO.11 coal-seam and so on, some supporting parameters for different distance of coal seam roof were carried out. The traditional conception of steel-frame supporting system for close seam roadway was changed by different bolting support manners, such as bolt and cable, bolt and short-cable, pre-tensioned and full length anchored bolt and so on. The practice showed that bolting support could make the need of roadway supporting under the gob of close coal seam. The supporting manner cancelled steel-frame, reduced labour intensity, and created conditions for improving the speed of tunneling.

Abstract:Against the problem of surrouding rock falling cavity and water inrush in mine shaft sinking through water bearing goaf, in combined with actual construction situation of return air shaft in Rundong coal mine, the paper provided the technology of “combined supporting and grouting fill” to make mine shaft smoothly through caving zone cavity; meanwhile in order to ensure the construction safety and construction quality of mine shaft, grouting in mine water bearing used roadway to form blocking water filling body for blocking the passage of water inrush. The results show that mine water yield changed from 50 square meters per hour to 0.5 square meters per hour after applicating the technology of grout-filling blocking water, the water plugging effect is obvious; at the same time after applicating the technology of “combined supporting and grouting fill” for supporting surrouding rock falling cavity, bearing capacity and deformation resistance of mine shaft surrounding rock in broken section significantly improve, and the wall is complete without breaking, supporting effect is significant.

This paper describes the use of driving anchor machine to achieve the dig anchor integration and the application in Wanli No.1 coal Mine, Shenhua Group. Based on the analysis of specific digging efficiency in 2011, 2012 and the rate of comprehensive utilization of equipment in 2012 in Wanli No.1 coal Mine, summarized the factors affect-ing driving efficiency, and combined with the lean management theory. A scheme is pre-sented from the roadway supporting parameters optimization, improved equipment com-prehensive utilization, incentive mechanism, etc, to form the reasonable digging anchor speedy drivage technology, improving specific digging efficiency. It can provide a refer-ence for similar mines realize speedy drivage.