一个基于砾质土的改进椭圆-抛物双屈服面模型
A modified ellipse-parabola double yield surfaces model on gravelly soil

针对椭圆-抛物双屈服面模型，对其屈服面的硬化准则及其对砾质土的适用性进行分析和讨论，在此基础上，对椭圆-抛物双屈服面模型进行改进，采用幂函数关系式反映椭圆屈服面的硬化准则，并对抛物屈服面的屈服方程进行修改. 采用改进的双屈服面模型对砾质土三轴试验的应力应变曲线进行模拟验证，模拟表明，改进的椭圆-抛物双屈服面模型更好地反映了砾质土的应力应变特性.
Based on the ellipse-parabola double yield surfaces model，the hardening criterion of the model and its applicability for gravel soil were analyzed and discussed，then a modified double yield surfaces model is proposed. The modified model takes a power function relation as the hardening rule of the elliptical yield surface，and the yield equation of the parabolic yield surface is also modified. The stress and strain curves of triaxial tests on gravelly soil were simulated by the modified model，the simulation results show that，the experimental results of gravelly soil can be better predicted by the modified model