广义Drucker-Prager强度准则

基于摩擦性材料的试验研究，在已有研究成果的基础上，提出了具有Drucker-Prager准则表达形式的广义非线性强度理论，即广义Drucker-Prager强度理论。该强度理论在偏平面上的强度函数是介于Drucker-Prager准则和Mohr-Coulomb准则外包线的光滑外凸曲线，在子午面上的强度函数为线性函数。该强度理论用一个表达式来统一描述材料的强度特性，包含或逼近了现有主要的非线性单一强度理论，并且在应力空间中偏应力和静水压力分离，容易与具体的应力应变模型相结合。

Generalized Drucker-Prager strength criterion

Based on the experimental and theoretic studies on the frictional materials in literatures , a generalized nonlinear strength theory is presented. The generalized strength theory has a form of Drucker-Prager strength criterion, in which a unified mathematical expression is used to describe the strength characteristic of various materials. The theory covers or approximates the classical nonlinear strength theories in existence. The generalized strength criterion is smooth curve between the Drucker-Prager criterion and the external contour line of Mohr-Coulomb criterion in deviator-plane, and which is linear function in meridian-plane. The hydrostatic pressure and the deviator stress are separated in stress space; so it can be easily integrated with the concrete constitutive model.