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考虑状态依赖性的弹塑性本构模型是当前现代砂土本构理论发展的一个主流方向,目前所引用的状态参量虽能够反映孔隙比与平均有效应力的联合效应,但尚不能反映剪切过程中的主应力方向对砂土应力-应变关系的影响。大量复杂应力条件下的空心扭剪试验证明,剪切中的主应力方向对砂土的变形和强度特性具有重要的影响。本文基于考虑砂土状态依赖性的本构理论,提出了一个含有主应力方向的砂土状态参量,并将其同时引入剪胀方程和塑性模量,以此为基础建立了一个能够反映剪切中主应力方向的砂土弹塑性本构模型。通过同相关试验数据的对比和分析,验证了该模型可以较好地模拟砂土在不同主应力方向下的应力-应变关系。
The state-dependent elastic-plastic constitutive model is a mainstream direction in the development of modern sand constitutive theory. Although the state parameters quoted now can reflect the combined effect of void ratio and average effective stress, the shear process Influence of Principal Stress Direction on Stress - Strain Relationship in Sand. Hollow torsional shear tests under a large number of complex stress conditions show that the principal stress direction in shear has an important influence on the deformation and strength characteristics of sand. Based on the constitutive theory which considers the state dependence of sand and sand, this paper presents a sandy soil parameter with direction of principal stress and introduces dilatancy equation and plastic modulus simultaneously. Based on this, Sandy Soil Elasto - Plastic Constitutive Model in the Direction of Main Stress. Through the comparison and analysis of the related test data, it is verified that the model can well simulate the stress-strain relationship of sand under different principal stress directions.