论文部分内容阅读
以宝鸡刘家泉滑坡体内具代表性的三门组黏土岩为研究对象,进行黏土岩物理性质分析和室内流变、快剪试验。试验结果表明,研究区域黏土岩矿物成分以伊利石–蒙脱石混层矿物为主,黏土岩具有成岩时间短、强度低、胶结程度差等特点,且具有明显的膨胀性。此外,室内流变剪切强度参数与快速剪切强度参数相比,摩擦因数f降低了66%,黏聚力c值降低了80%。剪切流变试验结果表明,位移随时间的增加,黏土岩表现为低应力条件下非线性黏弹性和高应力条件下线性黏塑性特性,具有良好的流变变形特征。在岩石流变结果分析的基础上,通过五元件广义Kelvin模型和Bingham模型串联代表黏土岩的流变模型,能较好地反映出黏土岩的流变特性,且计算曲线与试验结果能较好地拟合出蠕变的衰减蠕变阶段和等速蠕变阶段,并应用遗传算法对黏土岩流变本构模型进行参数辨识,拟合结果与试验结果能够很好地吻合。
Taking the representative Sanmen group clay rock in the Liujiaquan landslide in Baoji as the research object, the physical properties of clay rock and the laboratory rheological and shear tests were carried out. The test results show that the clay minerals in the study area are mainly illite-montmorillonite mixed layers. Clay rocks have the characteristics of short diagenesis time, low strength and poor cementation, and have obvious expansibility. In addition, the indoor rheological shear strength parameters and rapid shear strength parameters compared to the friction coefficient f decreased by 66%, cohesion c value decreased by 80%. The results of shear-rheological tests show that with the increase of displacement over time, clay rocks exhibit linear visco-elastic properties under low-stress conditions and linear viscoplasticity under high-stress conditions with good rheological deformation characteristics. Based on the analysis of rock rheological results, the rheological properties of clay rock can be well represented by the five-member generalized Kelvin model and the Bingham model in series, and the calculated curves and experimental results are good The decay creep phase and the isokinetic creep phase of creep were fitted. The genetic algorithm was used to identify the rheological constitutive model of clay rock. The fitting results agree well with the experimental results.