急倾斜坚硬岩柱动态破裂“声–热”演化特征试验

doi:10.13722/j.cnki.jrme.2015.1047

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Abstract Stability analysis of hard rock pillars is significant for hazards prediction to the mining of thick coal seams of extremely steep. Modeling the hard and extremely steep rock pillar experimentally was accomplished with the composite-loading facility. The temperature and acoustic emission(AE) parameters were recorded with the infrared thermal instruments and AE sensors. Areas of heat radiation on the surface of rock pillar were found to emerge with a low temperature area near the boundary，a middle temperature area between boundaries，and a high temperature area across the boundary. The hard rock pillars experienced different stages including the elastic deformation，the micro ruptures and the fracturing instability. The accumulation ratio of AE energy was increased continuously and the temperature in the radiation area was decreased gradually. The reasons of AE and temperature variation during the hard rock pillar failure were the thermo-elastic transformation effect and thermo-friction effect.

Key words： rock mechanics hard rock pillar dynamic failure infrared thermal image AE energy accumulation ratio AE and temperature variation

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.1047 OR http://www.rockmech.org/EN/Y2015/V34/I11/2285

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