三峡库区砂岩局部化及应变软化参数特征研究  

Study on Strain Softening Parameters and Localization Characteristics of Sand Rock in Three Gorges Reservoir Area

作　　者：邓成进[1] 王孔伟[1] 邓华锋[1] 杨姗姗[1] 鲁涛[1] 

机构地区：[1]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《水电能源科学》2010年第4期66-68,共3页Water Resources and Power

摘　　要：基于压缩试验分析砂岩变形局部化特征可知,砂岩变形局部化带在峰前逐渐形成,峰后沿局部化带稳定软化直至滑移剪切破坏。根据摩尔—库仑准则,引用塑性应变研究了砂岩峰后稳定软化时变形局部化带的屈服软化过程,获得了砂岩在不同塑性应变下的应力状态,分析了砂岩参数随塑性应变的软化变化规律,并在FLAC3D中采用峰后参数变化规律模拟岩样局部化特征。结果表明,计算结果与试验数据基本吻合。Analysis of deformation localization of sand rock by compression tests shows that localized belt is formed gradually at the pre-peak, and at the post-peak its along the localized belt with a stable softening process until shear failure. Based on Mohr-Coulomb criterion, localized yield softening process is studied with plastic strain. The stress state of sand rock corresponding to localized plastic strain is derived, and then the parameters softening law can be obtained at the softening process. Finally, the characteristics of deformation localization are simulated by the FLAC^3D through parameters softening. The results show that computation results are consistent with the experimental results.

关 键 词：砂岩 局部化带 稳定软化 应变软化参数 塑性应变 

分 类 号：TU457[建筑科学—岩土工程]