堆石料强度变形特性与非线性弹性本构模型研究

在大型三轴试验研究的基础上，提出了堆石料应力-应变关系、侧向应变与轴向应变关系的指数函数表达式，以及抗剪强度包线在q-p平面上的幂函数表达式。继而推导得到了一个反映堆石料强度与变形特性的非线性弹性本构模型。通过对实体工程的数值模拟，将Duncan E-B模型与新建模型进行了对比分析，验证了该模型的可行性。

Research on strength-deformation characteristics and nonlinear elastic model of rockfills

On the basis of large-scale triaxial tests for rockfills, the exponential function expressions about the relationship between deviatoric stress and axial strain or relationship between lateral strain and axial strain are proposed respectively. In addition, the failure envelopes of the rockfills in the planar coordinate system of octahedral shear stress and octahedral normal stress also can be described by the exponential function expressions. A nonlinear elastic constitute model is derived from these results which is suitable to shear strength and deformation characteristics of rockfills. Some analytical comparisons between Duncan E-B model and the new model proposed are carried out by means of simulation of an engineering instance, so as to confirm the feasibility of the new model.