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基于红黏土不排水三轴试验,首先观测了红黏土剪切破坏形态,分析其应力-应变曲线特性,讨论了红黏土剪切带形成条件,并对剪切带倾角进行测试与计算。试验结果表明:三轴不排水试验中,剪切带出现四种不同形式,分别为单一型、次单一型、双缝T型及多缝平行剪切带;红黏土剪切带的倾角量测值与剪切带理论计算结果存在较大差异,量测所得剪切带倾角均大于理论计算值,宜采用Mohr-Coulomb理论预测红黏土剪切带倾角;土体的不均匀性是土样产生剪切带的内因,外部荷载及边界条件是产生剪切带的外因,试样的围压及干密度为剪切带倾角的影响因子。
Based on the undrained triaxial tests of red clay, the shear failure modes of red clay were firstly observed, and the characteristics of stress-strain curves were analyzed. The formation conditions of red clay shear bands were discussed and the inclination of shear bands was tested and calculated. The test results show that there are four different forms of shear band in the three-axis undrained test, which are single type, sub-single type, double-slit T type and multi-slit parallel shear band respectively. Inclination measurement of red clay shear band The value of the shear band with the theoretical calculation results are quite different, measured by the shear band inclination are greater than the theoretical value, the Mohr-Coulomb theory should be used to predict the red clay shear zone dip; soil heterogeneity is soil samples The internal factors, external loads and boundary conditions of the shear band are the external factors that cause the shear band. The confining pressure and dry density of the specimen are the influencing factors of the shear band inclination.