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经典塑性理论把应变分成弹性应变及塑性应变两部分,不能圆满说明土的塑性变形性质。文中进一步把塑性应变分成若干部分,相应于每一部分有一个屈服面,由此形成多重屈服面的概念。根据土的变形特点,提出三重屈服面模式。三个屈服面分别称为压缩屈服面、剪切屈服面和剪胀压硬屈服面。对砂土和粘土分别建议了屈服函数的具体表达式,并引用两组试验资料加以论证。
The classical plasticity theory divides the strain into two parts: elastic strain and plastic strain, which cannot fully describe the plastic deformation properties of soil. In this paper, the plastic strain is further divided into several parts, corresponding to each part having a yield surface, thereby forming the concept of multiple yield surfaces. According to the deformation characteristics of soil, a triple yield surface model was proposed. The three yield surfaces are called the compressive yield surface, the shear yield surface and the shear yield pressure hard yield surface. The specific expressions of the yield function for sand and clay were respectively proposed, and two sets of test data were cited to demonstrate.