采动岩体能量释放及灾变机制研究  

MINING-INDUCED RELEASE OF ENERGY FROM ROCK AND MECHANISM ON CATASTROPHIC FAILURE

作　　者：薛东杰[1] 周宏伟[1] 钟江城 黄亚明[1] 

机构地区：[1]中国矿业大学力学与建筑工程学院,北京100083

出　　处：《岩石力学与工程学报》2014年第A02期3865-3872,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点基础研究发展计划(973)项目(2011CB201201);中国博士后科学基金资助项目(2014M550102);中央高校基本科研业务资助项目(2010YL07)

摘　　要：岩石硐室开挖或巷道掘进过程中,材料的采动力学行为取决于应力场的真实转换过程,是对应力场的真实响应,区别于材料本征力学行为。由此,设计采动力学试验,依据开挖过程中煤岩体支承压力与水平应力响应过程,从理论上与传统常规三轴试验材料本征力学行为结果对比,讨论采动力学行为下应变软化过程能量释放特性及突发性。进一步对地应力在能量存储的构成进行讨论,认为采动力学试验破坏所需要的能量远小于传统试验,合理解释煤岩体发生动力破坏的机制,浅部也有可能发生动力破坏,高地应力是能量聚集的主导因素,是发生动力破坏的必要条件而非充分条件。Mining-induced mechanical behavior of rock depends on the changing stress state,which is different from the intrinsic mechanical behavior. The mining-induced mechanical triaxial test has been designed based on the distribution of stress state during the excavation. The characteristics of released energy in strain softening process have been discussed by the contrast between conventional and mining-induced mechanical triaxial test from theory-based view. Furthermore,the composition of energy storage induced from in-situ stress is discussed with result that the critical value of necessary energy for destruction is far less than the traditional results. It is reasonable to explain the mechanism on dynamic failure of coal or rock. And there is one from the new thinking of mechanism on outburst that at the shallow depth dynamic failure may also occur,which means that the high in-situ stress is the dominant factor of energy storage,also a necessary condition for dynamic failure but not sufficient condition.

关 键 词：岩石力学 采动力学行为 能量 应变软化 动力破坏 

分 类 号：TU45[建筑科学—岩土工程]