土木与环境工程学报（中英文）2021，Vol.43Issue(1)：11-24,14.DOI:10.11835/j.issn.2096-6717.2020.162
超高应变率下岩石的破坏机理
Failure mechanism of rock under ultra-high strain rates
摘要
Abstract
We explored the failure mechanism of rock under ultra-high strain rates using 3D numerical modeling of the light gas gun test.Based on numerical results,it concluded that mesoscopic hydro-compressive failure rather than mesoscopic shear or tensile failure is the main mechanism of rock failure under the condition of shock compressive loading.The shock wave,indicated by the stress signals of two stress gauges in the rock specimen,can be well reproduced by numerical simulation with the quasi-static rather than the dynamic elastic parameters.The simulation results indicate that the compressive shock wave involves a compressive failure loading process similar to that shown in the conventional uniaxial compressive failure test rather than the ultrasonic test.A mesoscopic-rate-dependent failure model was developed to take the dynamic effect into account.Our results revealed that larger rock porosity could result in an decrease in dynamic strength and dynamic effect under shock compressive loading.关键词
动态破坏/轻气枪试验/冲击压缩荷载/格元模型Key words
dynamic failure/light-gas gun test/shock compressive loading/lattice spring model分类
建筑与水利引用本文复制引用
赵高峰,孙建华,李世金,张奔..超高应变率下岩石的破坏机理[J].土木与环境工程学报（中英文）,2021,43(1):11-24,14.基金项目
National Key R&D Program of China (Grant No.2018YFC0406804),National Natural Science Foundation of China (No.11772221) （Grant No.2018YFC0406804）
