挤压性围岩软化模型及在大变形分析中的应用  

Softening model for squeezed surrounding rock and its application in large deformation analyses

作　　者：鄢建华[1] 洪晓林[1] 汤雷[1] 

机构地区：[1]南京水利科学研究院,江苏南京210029

出　　处：《水利水运工程学报》2005年第2期28-31,共4页Hydro-Science and Engineering

摘　　要：根据挤压性围岩的受力特征,在平面应变相似材料模拟围岩挤压性变形试验的基础上,基于岩石微元强度服从Weibull分布,推导了岩石损伤演化方程,建立了能较好模拟岩石应力-应变曲线峰后的软化模型.该模型能反映岩石的软化特性及破坏的全过程,也能反映岩石强度受围压的影响.Based on the stress characteristics of squeezed rock and the plane strain similarity material tests to simulate squeezed rock deformation, the damage evolution equation of rock is deduced and a softening model which can well simulate the post-peak stress behavior of rocks is developed with the assumption that the strength of micro-element rock obeys Weibull distribution. The model can reflect the softening characteristics and whole process of rock′s deformation and failure, and the influences of surrounding stress on rock′s strength.

关 键 词：挤压性围岩 平面应变 相似材料试验 软化模型 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]