粉砂质泥岩常规三轴压缩试验与本构方程研究  

Research on conventional triaxial compression test and constitutive model of silty mudstone

作　　者：于怀昌[1] 李亚丽[1] 

机构地区：[1]华北水利水电学院资源与环境学院,河南郑州450011

出　　处：《人民长江》2011年第13期56-60,106,共6页Yangtze River

基　　金：国家科技支撑计划项目"973"计划(2008BAC47B01);河南省教育厅自然科学研究计划项目(2010B410003)

摘　　要：针对杭兰高速公路巫山至奉节段巴东组二段（T2b2）粉砂质泥岩地层中挖方高边坡易产生变形破坏的问题,采用TAWA-2000微机控制岩石三轴压力试验机对T2b2粉砂质泥岩进行了常规三轴压缩试验,获取了0~4 MPa围压下岩石的应力-应变全过程曲线。分析了岩石屈服强度、峰值强度以及残余强度与围压之间的关系,得出了岩石峰值抗剪强度参数以及残余抗剪强度参数。依据塑性力学理论,建立了考虑岩石应变软化的双线性弹性-线性软化-残余理想塑性四线性模型,并分段建立了本构方程,确定了各阶段方程的参数,研究成果可为高速公路挖方高边坡的变形破坏分析提供必要的资料。The excavated high slopes of 2nd member of Badong formation of Middle Tertian（called T2b2 for short） in Wushan-Fengjie section of Hangzhou-Lanzhou Expressway have possibility of sliding instability or failure.To solve this problem,the conventional triaxial compression tests of T2b2 silty mudstone are conducted by TAWA-2000 servo-controlled testing machine,and the complete stress-strain curves under 0~4MPa confining pressures are obtained.We analyze the relationship among the yield strength,peak strength,residual strength and the confining pressure,and obtain peak shear strength parameter and residual shear strength parameter.Based on the plastic theories,the constitutive model of bilinear elastic-linear softening-residual ideal plastic is put forward.The constitutive equations of silty mudstone in the above four phases are given,and the model parameters are determined.The results can provide reference to the deformation analysis of excavated high slopes in expressway.

关 键 词：粉砂质泥岩 三轴压缩试验 应力-应变全过程曲线 抗剪强度参数 本构模型 

分 类 号：P558.212.1[天文地球—构造地质学]