Advanced Materials Research Vols. 616-618

Abstract: Because the variation of mine gas concentration is influenced by various factors, so it’s impossible for traditional prediction methods of mine gas emission to include all the factors. To solve the problem, the paper proposed a prediction method of mine gas emission based on AR model of time series analysis. The experiment results indicated that the method can predict mine gas emission accurately.

Abstract: Attitude measurement of the drill bit is the key for horizontal directional drilling, which determines the final positioning accuracy. As for disadvantages of existing algorithms, a method is proposed to get the azimuth, the inclination, and the tool face angle based on gyros. In order to improve attitude measurement accuracy, a quaternion-based attitude complementary filter algorithm is adopted. The accelerometer and magnetometer are used to measure the components of the earth’s gravity field and magnetic field to compensate for gyro drift errors over time, while the gyro ensures the stability of the drill with dynamic acceleration and enhances the robustness of the system. Detailed analysis and simulation results are presented. Results show that the quaternion-based attitude complementary filter algorithm using multiple MARG (Magnetic, Angular Rate, Gravity) sensors can effectively reduce the gyro drift errors and make the attitude measurement error less than +/-0.3 degree.

Abstract: Using the method of THERPand HCR this paper studies post- accident human error events of mine hoisting system which reflects accident consequence seriousness and accident treatment urgency. It ascertains cognitive failure probability P1, non-response probability P2 and the failure probability P3, and quantities and appraises degree of human reliability. Finally this paper analyzes causes of hoisting accident human errors ,by which probability human error can be reduced to the lowest limit.

Abstract: The support effectiveness of mining gateway at closed-distance seam is determined by the layout of mining gateway and the stress effect of the upper coal pillar load on the bottom seam. The stress effect is affected by the coal pillar size and the properties of the coal pillar and surrounding rocks. These factors may cause the variation of the stress concentration, which could cause the difference in the stress distribution on the bottom seam. This paper studies on the proper coal pillar size of ultra closed-distance upper and bottom coal seam in Fu Cheng coal pit and the layout of the mining gateway.

Abstract: Aiming at the present situation of complex environment and safety monitoring system in coal mine, this article proposes one kind design scheme about wireless system in coal mine monitoring based on the 3G technology, introduces the hardware and software design. The system makes use of monitoring terminal completed field data collection and processing, image and alarm signal are accessed internet through the 3G wireless network, realize remote monitoring center real-time video monitoring on the mine site.

Abstract: The heights of fully-mechanized mining water-flowing fracture zone of Yanzhou mining area were measured by borehole simple hydrology method .In order to confirm the influence degree of the geology and mining factors to the damage height of overburden rock , the paper analyses the measured data by using grey relation analysis theory, and concludes that the face span, mining thickness and mining depth are main influence factors to the height of the water-flowing fracture zone. On this basis, the paper reveals the general rules of fully-mechanized caving mining overburden rock destruction with the on conditions of gentle dip, thick coal seam and hard and medium hard roof by using regression analysis method.

Abstract: Simevariogram can preferably reflect basic characteristics of regionalized variables of one orebody in geology, especially it can reflect structrural change of the variables by random change of the variables. It’s proved that using ordinary kriging method and a traditional method are generally coincident and the deposit in China undergoes early biochemical sedimentary mineralization and later granitic superimposed mineralization.

Abstract: Based on synergetic, this paper ascertained state variables of the safety management system by factor analysis. Then the order parameter (safety culture) was selected. Finally, in order to realized the change of safety management from rigid administration to people-oriented management, the slave function of safety culture was analyzed and the management methods of safety culture were stated.

Abstract: This article makes a systematic analysis of the formation mechanism of coalfield fire and the progress of research on the extinguishing and control technology, lays the stress on the exposition of the findings from the researches made by the scholars at home and abroad from two aspects such as the breakout, development and evolution mechanism of coalfield fire and the extinguishing and control technology for the coalfield fire, including the coalfield fire combustion reaction kinetics mechanism, coalfield fire zone coal petrology fluid solid thermal coupling mechanism, coalfield fissure medium mass transfer model, research on natural convection and porous combustion characteristics, coalfield fire detection and identification, monitoring and control technology, extinguishing and control technology, process and material, and still considers the accurate detection and identification of the fire source position, new grouting extinguishing material and process, and the action mechanism of the environmental impact as the difficulties to be solved immediately.

Abstract: Once the lead abutment pressure influence the fault structure, its internal rock mass is damaged easily while the fault structures are the most vulnerable of mining influence weak link. If the fault structures conduct the aquifer, the mine water inrush will occur. This paper researchs water level of Taiyuan limestone aquifer with three-dimensional form simulation and analyzes mine water movement characteristics and the change of water level and hydraulic contact of each aquifer combining with complex geological conditions of Wugou mine, aiming at tectonic evolution and tectonic combination characteristic of the mine, according to the long observation hole material. Combining with water pressure test results and drilling and geophysical prospecting achievement, using daubing coefficient method to analyze sealing of fault structure, we conclude that faults are pressure-torsional normal faults which their fault zone is compact and has high strength so we can narrow even do not leave set fault waterproof pillar in Wugou mine.