强度的应变率效应对剥离破坏影响的数值分析  

NUMERICAL ANALYSIS OF STRAIN-RATE EFFECT OF STRENGTH ON SPALLATION OF ROCKS

作　　者：戚承志[1,2] 赵跃堂[3] 钱七虎[3] 

机构地区：[1]北京建工学院土木工程系 [2]解放军理工大学南京210007 [3]解放军理工大学

出　　处：《岩石力学与工程学报》2004年第7期1091-1094,共4页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金(A50179038号);教育部回国留学人员启动基金(教外司留[1999]747号)资助项目。

摘　　要：应变率对于岩石的强度有显著的影响,因而也影响岩石的破坏情况。就强度的应变率依赖性对同种岩石剥离破坏的影响进行了研究。从分析结果可以看出,在岩石受到强烈应力波作用时,岩石强度的提高会使岩石的塑性范围减少,应力波的衰减速度减小,并进而引起自由面反射应力波幅值增大,对于抗拉强度受薄弱面控制的岩石的破坏作用增大。Strain rate affects the strength of rocks significantly,and therefore affects the fracture of rocks. In this paper the effect of strain rate on the spallation of rocks is studied. It is shown from the analysis that the increase of strength of rocks under intensive stress waves causes the decrease of plastic zone and the decrease of wave attenuation. This,in turn,causes the increment of magnitudes of reflection stress waves from free surface,and increases the potential of rock spallation when the tensile strength is mainly controlled by weak layers.

关 键 词：岩石力学 剥离破坏 数值分析 应力波 抗拉强度 

分 类 号：TU452[建筑科学—岩土工程]