胶凝砂砾石材料本构模型研究

胶凝砂砾石材料是一种低强度的筑坝新型材料.在分析胶凝砂砾石材料三轴试验数据的基础上,得出胶凝砂砾石材料的初始切线弹性模量、残余强度和峰值强度与围压的关系,从而建立了包含6个参数的非线性软化本构模型.将建立的本构模型计算所得的理论曲线与三轴试验数据进行对比,吻合情况良好,说明该模型能够较好地反映胶凝砂砾石材料的应力-应变特征,可以为胶凝砂砾石坝的非线性分析提供依据.

Study on Constitutive Model of Cemented Sand and Gravel Material

Cemented sand and gravel material is a low-intensity damming new material. Based on the analysis of triaxial test data on ce- mented sand and gravel material, the correlativity between the original tangent modulus, the residual strength, the residual strength, peak strength and the ambient pressure is deduced, then a nonlinear and soften constitutive model for cemented sand and gravel materi- al is put forward in which six parameters can be determined by the triaxial test. The theoretical curve calculated by the constitutive model fits closely with the the triaxial test data. It shows that the model can better display the stress-strain features of cemented sand and gravel material, and this can provide a reference for the nonlinear analysis of cemented sand and gravel dam.