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针对传统塑性力学中土的屈服曲面是以等倾线为轴的各向同性曲面,无法考虑原状土的K0固结这一常规初始状态以及各向异性等结构性属性,在描述原状土的屈服、破坏等力学性能时不能很好地拟合试验的问题,类似等倾线与π平面,以K0固结线为轴线,建立了可以反映土的各向异性的χ平面.并在此基础上构造了适用于原状土的修正Lade-Duncan模型.对既有π平面上真三轴试验数据的数学分析表明,修正Lade-Duncan模型能更客观的描述原状土的屈服、破坏、各向异性等结构性属性.
In traditional plastic mechanics, the yield surface of soil is an isotropic curved surface with equiangular axis, which can not consider the conventional initial state of K0 consolidation and the structural properties such as anisotropy of undisturbed soil. When describing the yield of undisturbed soil , Failure and other mechanical properties of the test can not fit the problem, similar to the isosceles and π plane, the K0 consolidation line as the axis, the establishment of an anisotropic χ plane can reflect the soil and on this basis A modified Lade-Duncan model for undisturbed soil is constructed.The mathematical analysis of the true triaxial test data on the existing π-plane shows that the modified Lade-Duncan model can more objectively describe the yield, failure and anisotropy of undisturbed soil Structural attributes.