In order to explore the applicability of the hardening soil constitutive model for numerical analysis of soft soil underground engineering in the Pearl River Delta region,and based on four different stress path triaxial tests,the mechanical properties and variation of constitutive model parameters of hardening soil were analyzed for the typical silty soil in this region.Research results have shown that lateral unloading and drainage conditions have significantly impact on the partial parameters of constitutive model,such as the strength parameters of c'and φ',the stiffness parameters such as Eref50、Erefur and m,but the impact on the failure ratio Rf is relatively small.For the consolidated undrained lateral unloading condition,the main parameters of the constitutive model for typical silty soil in the Pearl River Delta region are shown as the reference secant modulus Eref50 is 2.34 MPa,with reference to tangent modulus Erefoed is 1.59 MPa,with reference to the loading unloading modulus Erefur is 11.67 MPa,with a failure stress ratio of Rf is 0.98,and the power exponent m related to stiffness stress level is 1.84;Among them:Eref50 is 1.47 times of Erefoed,E is 7.34 times of Erefoed.The practice of a deep foundation pit of soft soil in the Pearl River Delta has proven that the constitutive model of hardening soil is suitable for simulating the mechanical properties of soft soil in this region.
关键词
硬化土本构模型/应力路径/排水条件/模型参数
Key words
constitutive model of hardening soil/stress path/drainage conditions/model parameters
维普
万方数据