摘要
通过从破裂形态、能量吸收和力学参数这三个方面对岩石在中、低应变率下的动态破坏机理的分析,提出了一种快速计算岩石动态抗压强度的方法。采用拟静力法结合虚功原理建立关系式,认为外力对岩石所作的功超过了岩石发生的内部能量损耗,岩石无法承受该外荷载而发生破坏。因此动态抗压强度σ_(cd)等于静态抗压强度σ_c与应变率效应导致的强度提高值之和。最后将动态抗压强度计算值与已有文献的实验解进行对比,吻合度良好。
The dynamic failure mechanism of rock in intermediate and low strain-rate was analyzed from three aspects-failure modes,energy absorption,and mechanical parameters,A new method to calculate the dynamic compressive strength of rock was presented.A pseudo-static method combined with the principle of virtual work was used to build the formula.The work done by external force to rock was considered more than the internal energy loss,and the damage happened because of the rock cannot endure the external load.Therefore,the dynamic compressive strengthσcd is equal to the sum of the static compressive strengthσc’and the increased strength by the strain-rate effect.Then the calculated value of the dynamic compressive strength was compared with the experimental results in literatures.
作者
杨仁树
陈骏
肖成龙
陈帅志
YANG Renshu;CHEN Jun;XIAO Chenglong;CHEN Shuaizhi(School of Mechanics and Architecture Engineer,China University of Mining and Technology(Beijing),Beijing 100083,China;State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology(Beijing), Beijing 100083,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2018年第4期123-127,共5页
Journal of Vibration and Shock
基金
国家重点研发计划资助(2016YFC0600903)；国家自然科学基金青年基金(51404273)
关键词
动态抗压强度
破坏机理
SHPB
拟静力法
dynamic compression strength
failure mechanism
SHPB
Pseudo-static method
