胶凝堆石料大三轴试验

Large-scale triaxial tests for CSG materials

在大三轴试验的基础上,得到不同胶凝体质量浓度、不同围压下的应力-应变曲线,通过试验数据对胶凝堆石料本构模型进行探讨,并求出了模型中的参数。研究结果表明:当胶凝体质量浓度较低时,对胶凝堆石料运用邓肯-张本构模型基本满足工程精度要求;随着胶凝体质量浓度的增加,从应力-应变曲线中发现邓肯-张本构模型已不再适用,但曲线在弹性阶段表现出明显的线性特性,线性模型的弹性模量与胶凝体质量浓度、围压有关。通过试验数据,拟合得出线性模型中相关参数之间关系的表达式。

Based on large-scale triaxial tests, stress-strain curves with ambient pressures were obtained. A constitutive model for CSG materials model parameters were derived. The results show that the Duncan-Chang different cement contents and different was investigated using test data, and the constitutive model for CSG materials met the engineering accuracy standard when the cement content was low. With the increase of the cement content, it can be seen from the stress-strain curve that the Duncan-Chang constitutive model was no longer applicable, but the curve showed obvious linear characteristics in the elastic stage, and the elastic modulus of the linear model was related to the cement content and ambient pressure. The expression of the parameters of the linear model was obtained based on the test data.