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Zhang X.,Taiyuan University of Technology | Wang A.,Taiyuan University of Technology | Wang A.,China National Coal Group Corporation | Li J.,Taiyuan University of Technology
Procedia Engineering

This paper introduced function design and development flow of virtual reality system of fully mechanized mining face. In the process of geometric modeling, element partitioning, instance,atomization and other technologies were used to improve the real-time performance of virtual view. With hydraulic support as the example,based on analysis of 4-linkage motion mechanism,the paper built the motion model and realized behavioral modeling. Virtual reality system in fully mechanized mining face was built by means of OpenGL and Visual C++ 6.0 and it has obvious stereo vision effect.The system has interaction functions of scene roaming and equipment operation. In addition, the production process of fully mechanized mining face could be simulated. Design and realization of this system put forward a new approach to miner training, student practice and disaster relief maneuvers. © 2011 Published by Elsevier Ltd. Source

Yao Q.-L.,China University of Mining and Technology | Li B.,China University of Mining and Technology | Li B.,China National Coal Group Corporation | Ren S.-J.,China University of Mining and Technology | Li X.-H.,China University of Mining and Technology
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering

The supporting technology of hollow grouted anchor cable combined with high performance bolt can effectively the instability of high ground stress roadway in soft coal seams. There are some problems during deep driving for the return airway of fully mechanized sub-level caving face 3313 in a coal mine, such as great deformation and supporting failure, etc. The main factors of roadway instability are high ground stress, poor mechanical properties of surrounding rock, and unreasonable support parameters. Releasing pressure under high pre-stressed bolt supporting and improving the mechanical properties of roof strata in a large range by grouting using hollow grouted anchor cable are the keys of the technology. This technology can effectively control the development of plastic zone, enhance the strength of roof strata and improve the stress state of bolt (anchor cable). Practice shows that the technology can reduce the damaged zones to 1 m and decrease the deformation of roadway roof, floor, and roadway's sides by 63.6%, 53.3% and 51.7% respectively, which also effectively controls the deformation of surrounding rock in this roadway. Source

Tan Q.-L.,North China Electrical Power University | Yuan H.-Z.,North China Electrical Power University | Tan Y.-K.,North China Electrical Power University | Zhang X.-P.,North China Electrical Power University | Li X.-F.,China National Coal Group Corporation
2010 International Conference on E-Product E-Service and E-Entertainment, ICEEE2010

Support vector machines (SVM) is a widely used method which can treat problems involving small sample, devilish learning, and high dimension. The current paper conduct a multivariate SVM in a total-factor production framework, and the GDP per capita, capital stock and labor are taken as the independent variables and the energy consumption is the dependent variable. The Gaussian radial basis function is taken as the kernel function, and then the energy consumptions of Beijing between the periods 1978-2008 are forecasted. The empirical results suggest that the multivariable SVM is valid in forecasting energy consumption. ©2010 IEEE. Source

Li X.,China National Coal Group Corporation | He M.,China University of Mining and Technology
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition)

In order to resolve the problem with long working period of processing mass data in geothermal and geological domains and the requirements for rapid and scientific management decisions in the geothermal work in Tianjin, and satisfy the needs of scientific planning, a simple and intelligent tool is provided for the sustainable exploitation of geothermal resources. Based on the previous geothermal work in Tianjin, the methodology of “two lines and one surface” 3D dynamic region division is presented. The geothermal reservoir sub-region planning project and the geothermal well search and approval system are developed by using MapGIS SDK and Visual Basic, which provide a rapid, overall and directly perceived sub-region planning with the function of dynamic tracking. In the planning period, a set of annual region division planning map will be produced by the system based on the annual geothermal reservoir dynamic observation data, for the reference of the administrative department commanding planning status and dynamic approval. ©, 2015, Jilin University Press. All right reserved. Source

Qu Z.-M.,Hebei University of Engineering | Zhou X.-Q.,China University of Mining and Technology | Li T.-S.,China National Coal Group Corporation
Chongqing Daxue Xuebao/Journal of Chongqing University

According to the volatile combustion, the mathematical and physical models on the volatilization combustion of coal field fire area are established. The governing equations are analyzed by analytic method. The parameters such as volatilization combustion speed, the content of volatile component and the flame temperature are obtained at relatively high temperature environment. According to the solutions, the flame temperature of the volatilization combustion is calculated by the heat insulation temperature in the light of the low-heat value of the volatile component. Due to the free or forced convection in the actual fire area, the true temperature would be lower than the calculation. Through experiment, heating process takes the greatest impact on the heating surface but least on inner parts. The temperature is increased and the heating surface temperature will exceed the temperature and continue increasing, which indicates that the coal begins oxidation. While the airflow is increased, the temperature will be slightly increased. The temperature is descent more slightly in the coal temperature because of thermal radiation. Source

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