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通过室内试验测定了深圳地区某典型淤泥质粘土的修正剑桥模型参数,基于固结不排水剪切(CU)试验的有效应力路径建立了所述软土的应力应变本构方程,利用4/5阶龙格库塔法求解了微分方程的数值解,并通过计算值与试验值进行对比,验证了修正剑桥模型对于深圳海积软土的适用性。临界状态有效应力比M值通过CU试验测得,为得到CU试验的有效应力路径方程,将孔隙水压力随偏应力的变化关系采用二次多项式拟合,拟合效果较好。从土的本构关系理论出发,通过室内试验与结果分析,测定了深圳地区某典型软土的修正剑桥模型参数,并通过对照组的试验予以预测和验证得到了较理想的结果。
The modified Cambridge model parameters for a typical silty clay in Shenzhen area were determined by laboratory tests. The stress-strain constitutive equation of the soft clay was established based on the effective stress path of consolidated undrained shear (CU) The Runge-Kutta method solves the numerical solution of the differential equation, and compares the calculated value with the experimental value to verify the applicability of the modified Cambridge model to Shenzhen marine soft soil. The critical state effective stress ratio M is measured by CU test. To obtain the effective stress path equation of the CU test, the quadratic polynomial fitting is used to calculate the relationship between the pore water pressure and the deviatoric stress. The fitting effect is good. Based on the constitutive theory of soil, through the laboratory test and result analysis, the modified Cambridge model parameters of a typical soft soil in Shenzhen area were determined, and the results of the control group were predicted and verified to obtain the ideal results.