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基于空间滑动面理论，本文提出了一种平面应变条件下无粘性土的破坏准则。该准则将平面应变和三轴条件下土的有效内摩擦角联系起来，只需通过三轴试验就可以确定平面应变条件下土的有效内摩擦角和破坏准则。此外，本文还证明，平面应变条件下无粘性土的破坏条件，就是三维应力条件下等效内摩擦角达到极大值的条件。试验结果验证了该准则的正确性。
Based on the theory of spatial sliding surface, this paper presents a failure criterion for cohesionless clay under plane strain conditions. This guideline relates the effective internal friction angle of soil under plane strain and triaxial conditions. Only the triaxial test can determine the effective internal friction angle and failure criterion of soil under plane strain condition. In addition, this paper also proves that under the condition of plane strain, the failure condition of non-cohesive soil is the condition that the equivalent internal friction angle reaches the maximum under three-dimensional stress. The test results verify the correctness of the criterion.