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Sun X.,State Key Laboratory of Deep Rock Mechanics and Engineering | Sun X.,China University of Mining and Technology | Wu C.,State Key Laboratory of Deep Rock Mechanics and Engineering | Cai F.,State Key Laboratory of Deep Rock Mechanics and Engineering
Mining Science and Technology | Year: 2010

Pump chambers, normally used as dominant structures in mining engineering to insure the safety and production of underground coal mines, become generally deformed under conditions of deep mining. Given the geology and engineering condition of Qishan Coal Mine in Xuzhou, the failure characteristics of pump chambers at the -1000 m level show that the main cause can be attributed to the spatial effect induced by intersectional chambers, where one pump is constructed per well. We developed an optimized design of the pump room, in which the pump wells in the traditional design are integrated into one compounding well. We suggest that the new design can limit the spatial effect of intersectional chambers during construction given our relevant numerical simulation. The new design is able to simplify the structure of the pump chamber and reduce the amount of excavation required. Based on a bolt-mesh-anchor with a rigid gap coupling supporting technology, the stability of pump chamber can be improved greatly. © 2010 China University of Mining and Technology. Source


Song L.,China University of Mining and Technology | Song L.,State Key Laboratory of Deep Rock Mechanics and Engineering | Liu W.-Q.,China University of Mining and Technology | Liu W.-Q.,State Key Laboratory of Deep Rock Mechanics and Engineering | Jin C.-J.,Xuzhou Construction Machinery Group
Gongcheng Lixue/Engineering Mechanics | Year: 2012

Coal has also scale-dependent mechanical properties like many other rock materials. Based on the Weibull theory and the assumption that strength is randomly distributed for brittle materials, a scale constitutive model in uniaxial compression for coal samples with the effect of interfacial friction is developed according to the theory of damage mechanics, and then the model is verified by uniaxial compressive experiments. Results show that the ultimate compression strength of coal samples obviously decreases as the aspect ratio increases, and the interfacial friction becomes the main reason for the differences of the results between Weibull theory and experiments. While the results obtained from the modified model agree better with experiments ones, it can reflect the law of changeable uniaxial compressive strength with the coal sample size and describe almost the whole process of uniaxial loading. Source


Song L.,China University of Mining and Technology | Song L.,State Key Laboratory of Deep Rock Mechanics and Engineering | Liu W.,China University of Mining and Technology | Liu W.,State Key Laboratory of Deep Rock Mechanics and Engineering | And 3 more authors.
Procedia Engineering | Year: 2011

Gas coal has also scale-dependent mechanical properties like many other rock materials. It becomes significant to select its mechanics parameters for determining critical conditions of coal and gas outburst and other application in fields such as the underground excavation design of room and pillar. Based on the Weibull theory, a scale constitutive model in uniaxial compression for gas-saturated coal is raised. The scale-dependent variation of ultimate compression strength under different gas pressure is specifically studied. We discuss the effects of interfacial friction during testing and modify our model according to the testing results. Results show that, the ultimate compression strength of coal samples decreases as gas pressure and the ratio of height to diameter increase. The differences between theoretical and experimental results for ultimate compression strength mainly depend on the interfacial friction. The model reasonably agrees with the testing results after modifying, and it can reflect the law of changeable uniaxial compressive strength with the coal sample size and describe almost the whole process of uniaxial loading. © 2011 Published by Elsevier Ltd. Source

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