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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。
Taking the gray mudstone of urban and rural drinking water source project in Guyuan of Ningxia as an example, the triaxial compression stress-strain curve of the whole process was systematically tested by TAW-2000 computer-controlled rock high and low temperature triaxial testing machine under different confining pressures the study. The relationship between yield strength, peak strength, residual strength and confining pressure of rock is analyzed. The peak shear strength parameters and residual shear strength parameters of rock are obtained by regression analysis. According to the related theories of plastic mechanics, a bilinear elastic-linear softening-residual perfect plasticity quadruple model considering rock strain softening is established. The constitutive equations of four stages of gray mudstone are obtained, and the relevant parameters of each stage equation are determined. The results It can provide a reference for the selection of rock mechanics parameters in the design of underground geotechnical engineering in this area.