摘要
采取多种措施改进了分离式Hopkinson压杆试验技术,用改进的设备对三峡坝址处的花岗岩进行了大量的动态单轴压缩试验和劈裂试验,发现该岩石具有明显的应变率效应,其动态压缩破坏呈3种形态:边缘崩落、留心破坏、完全破坏;探讨了相应的破坏机制;分析了应变率对动态弹性模量和动态抗压强度的影响;以Hoek-Brown破坏准则为基础建立了相应的动态破坏准则。
The split Hopkinson pressure bar test equipment was improved through adopting multi-measures.A number of dynamic compression tests and dynamic split tests were conducted with the improved apparatus for the Three Gorges granite under high strain rate.It is found that strain rate effect is obvious and dynamic compression failure of the test simples can be divided into three patterns;i.e.edge fall apart,core no damage and completely failure.The failure mechanism of the rock is discussed;and the effects of strain rate on dynamic elastic modulus and dynamic compression strength are analyzed.Finally,a dynamic failure criterion of rock based on the Hoek-Brown failure criterion is proposed.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2007年第9期1833-1840,共8页
Rock and Soil Mechanics
