灰质泥岩常规三轴压缩试验与本构方程的研究  

Research on Conventional Triaxial Compression Test and Constitutive Model of Calcareous Mudstone

作　　者：黄志全[1] 王成[1] 高芸[2] 

机构地区：[1]华北水利水电大学资源与环境学院,河南郑州450011 [2]华北水利水电大学水利学院,河南郑州450011

出　　处：《建筑科学》2014年第1期87-92,共6页Building Science

基　　金：国家自然科学基金资助项目(41140030);郑州市创新型科技人才培育计划领军人才项目(10LJRC185)

摘　　要：以宁夏固原地区城乡饮水安全水源工程灰质泥岩为例,使用TAW-2000型微机伺服岩石高低温三轴试验机对其在不同围压条件下的三轴压缩应力-应变全过程曲线进行系统的试验研究。分析岩石的屈服强度、峰值强度、残余强度与围压之间的关系,采用回归分析得出岩石峰值抗剪强度参数和残余抗剪强度参数。根据塑性力学的相关理论,建立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,得到灰质泥岩4个阶段的本构方程,并确定各阶段方程的相关参数,研究结果可为该地区地下岩土工程设计时岩石力学参数的选取提供参考依据。The conventional triaxial compression tests of calcareous mudstone trom buyuan urJaan anu rural drinking water resources engineering of Ningxia Province are conducted by using TAW-2000 type computer servo rock high and low temperature triaxial testing machine, the stress-strain complete process curves under different confined pressures are attained. The relationship among the yield strength, peak strength, residual strength and the confining pressure are analyzed, and rock peak shear strength parameter and residual shear strength parameter through analyzing the curve fitting are obtained. Based on the plastic theories, the constitutive model of bilinear elastic-linear softening-residual ideal plastic is put forward. The constitutive equations of calcareous mudstone in the four phases are given, and the model related parameters are determined. The results can provide reference to the analysis of underground geotechnical engineering.

关 键 词：灰质泥岩 常规三轴压缩试验 应力 应变全过程曲线 抗剪强度参数 本构模型 

分 类 号：TU459.1[建筑科学—岩土工程]