大理岩三轴压缩动态卸围压与岩爆模拟分析

Experimental study on dynamic unloading of the confining pressures for a marble under triaxial compression and simulation analyses of rock burst

对岩爆研究的现状进行较详细阐述。为分析岩爆形成机理,采用大理岩分别进行了三轴压缩峰前峰后动态卸围压实验。结合分岔过程,对三轴压缩过程的剪切断裂能进行分析,其结果表明:峰前卸围压过程的剪切断裂能远低于峰后卸围压过程和常规三轴压缩过程;而此过程岩体的破坏程度则强烈得多。由此也说明,张拉破坏是岩爆产生的根本内因。

Both in-situ and laboratory studies proposed nowadays on rock burst were briefly reported in present paper. In order to analyze the mechanism of rock burst, experimental analyses on dynamic unloading the confining pressures at the pre- and post-peak were conducted for a marble under triaxial compression. Bifurcation method was introduced in the discussion of shear fracture energy of these processes. The results show that the energy in the process of unloading the confining pressures at the pre-peak is much lower than those at the post-peak and the conventional triaxial compression, while the specimens failed much more seriously. It could be concluded that it was the local tensile failure in rock that led to rock burst.