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区别于金属等材料,土体具有压硬性和剪胀性两个基本性质,为非胡克材料,其应力应变关系也区分为应变硬化型和软化型两种。针对三轴排水剪切试验情况,提出了一种新的剪切曲线描述模式和一种新的体变曲线描述模式,两种描述模式均包含4个参数,各参数的物理意义明确且容易确定。结合沈珠江提出的三参数非线性弹性模型,初步提出了一种修正模型。利用一组三轴排水剪切试验数据对提出的修正模型进行了验证,结果表明,该修正模型能较准确地反映土体的应变软化特性和剪胀性,同时还可以描述土体小应变条件下表现出的刚度高度非线性和高模量特征。
Differing from metal and other materials, the soil has two basic properties of compressive rigidity and dilatancy, which are non-Hook materials. The stress-strain relationship is also divided into two types: strain hardening and softening. According to the triaxial drainage shear test, a new description model of shear curve and a new description model of body deformation curve are proposed. Both of the description modes contain four parameters, the physical meaning of each parameter is clear and easy to determine . Combined with the three-parameter nonlinear elastic model proposed by Shen Zhujiang, a modified model is proposed. A set of three-axis drainage shear test data is used to verify the proposed model. The results show that the modified model can more accurately reflect the soil strain softening and dilatancy, and can also describe the soil small strain conditions The stiffness exhibited under the highly nonlinear and high modulus features.