摘要
地下岩石结构的变形破坏是能量耗散与能量释放的综合结果。岩石结构内部储藏的可释放应变能和己耗散能的计算,涉及到在当时工况下岩石的卸荷弹性模量和泊松比,并与加载速度与载荷水平有关。该文在不同加载速度及不同载荷水平下,对岩石试件进行了单压加卸载实验,得到了卸荷弹性模量与泊松比、可释放应变能与耗散能的变化规律;进行了SHPB动态冲击实验,实测了试件内的总吸收能;实验分析结果为进一步对岩石结构进行可释放应变能与耗散能总量计算以及对岩石结构破坏程度进行预估计,提供了实验基础。
The failure of an underground rock structure is a synthetic process of energy dissipation and energy release.The releasable strain energy stored in rock structure and dissipated energy mainly depend on the unloading elastic modulus and Poisson＇s ration of rocks in-situ and are related to the loading rate and load level.In this paper,static cyclic loading-unloading uniaxial compression tests under different loading rates are carried out.The variation laws of unloading elastic modulus and Poisson＇s ratio,as well as the releasable strain energy and dissipated energy are obtained.The SHPB impact tests are also conducted and the total absorbed energy is measured.The testing analysis results can be used for the calculation of releasable strain energy,dissipated energy in a rock structure and for the prediction of rock structure failure.
出处
《工程力学》
EI
CSCD
北大核心
2011年第3期35-40,共6页
Engineering Mechanics
基金
国家重点基础研究发展规划(973)项目(2011CB201201
2010CB226802)
国家自然科学基金项目(41072242)
关键词
卸荷弹性模量
卸荷泊松比
可释放应变能
耗散能
加载速度
载荷水平
unloading elastic modulus
unloading Poisson＇s ration
releasable strain energy
dissipated energy
loading rate
loading level
