大理岩等围压三轴压缩全过程研究Ⅱ:剪切断裂能分析

STUDY ON COMPLETE PROCEDURES OF MARBLE UNDER TRIAXIAL COMPRESSION Ⅱ: ANALYSES OF SHEAR FRACTURE ENERGY

通过对等围压三轴压缩和峰前峰后卸围压过程岩石试样的不同破裂形态和宏观破坏角的对比分析,结合大理岩应力-应变全过程中的分叉行为,提出剪切断裂能的计算方法,分析了剪切断裂能的发展过程,揭示了峰前卸围压破裂强烈的原因。

Based on the comparative analysis of different failure properties and macro-fracture angles ofconventional triaxial compression tests and unloading confining pressure tests at the pre- and post-peak of marblethe methods are proposed to calculate the shear fracture energy according to the bifurcation behavior of complete procedures. The development of shear fracture energy during these processes is obtained. And then,the fact that rock specimens of unloading confining pressure tests at the pre-peak are destructed more intensely than those of unloading confining pressure tests at the post-peak is investigated.