现有的土体强度研究主要集中在土体受到压缩剪切作用,而针对单轴拉伸、拉剪耦合或多向拉伸作用的研究较少。当前土的联合强度理论仍建立在土体受压缩剪切作用的基础上,不适用于分析土的抗拉强度和拉剪耦合强度。针对饱和黏土中的拉剪联合作用,建立了饱和黏土的张拉-剪切耦合强度模型,给出了饱和黏土张拉-剪切耦合强度公式以及多向拉伸作用下的强度公式;基于已有的饱和黏土试验数据以及所做的饱和黏土室内试验数据对所建立的强度模型预测能力进行了验证,并与其他联合强度模型进行对比分析,检验了强度模型的适用性和准确性;强度模型全面、合理地描述了饱和黏土的压剪强度、张拉-剪切耦合强度及多向拉伸强度特征,为饱和黏土张拉-剪切耦合问题的解决奠定了理论基础。 The existing research on soil strength mainly focuses on the compressive shearing of soil, and few studies on the effects of uniaxial tension, shear coupling and multi-direction stretching. The current joint strength theory is still based on the compressive shear of soil, which is not suitable for the analysis of soil tensile strength and tensile shear coupling strength. According to the joint action of tension and shear in saturated clay, the model of tension-shear coupling strength of saturated clay is established. The formula of tension-shear coupling strength of saturated clay and the strength formula under multi-direction tension are given. Some saturated clay test data and the saturated clay indoor test data to verify the strength of the model established and compared with other joint strength model to test the applicability and accuracy of the strength model; strength model The compressive shear strength, tensile-shear coupling strength and multi-directional tensile strength of saturated clay are comprehensively and rationally described, which lays a theoretical foundation for solving the tension-shear coupling problem of saturated clay.