岩土材料非线性本构模型的开发与验证
Development and verification of nonlinear constitutive model for geotechnical materials

摘要 在增量塑性理论框架下，开发一种适用于岩土材料的非线性数值本构模型，利用开发的模型模拟三轴压缩试验、单轴拉伸试验及三轴拉压组合试验，并与室内试验结果和常用理论模型计算结果进行对比分析.结果表明：本文模型能够更有效地反映岩土体材料压缩、拉伸、压缩到反向拉伸、应变软化及循环加卸载状态，并通过单参数调节实现曲线形式由线性到双曲线的转变，弥补了现有模型的不足.
Abstract：Based on the framework of incremental plasticity theory, a nonlinear numerical model is developed in this paper, which is used to simulate triaxial compression test, uniaxial tensile test and triaxial tensile and compression test, and the numerical results of these laboratory tests are compared with previous experimental results and calculations of existing numerical models. The results show that the model can reflect the conditions of geotechnical materials including stress-strain characteristics, the process from compression to reverse tension, strain softening and cyclic loading-unloading more effectively. It’s able to achieve the transformation from liner stress-strain curve to hyperbolic curve through the adjustment of single parameter, which makes up for the deficiency of the existing constitutive model.