加筋粗粒土大型直剪试验及本构模型适用性研究

Large direct shear test of reinforced coarse grained soil and study of constitutive model applicability

以粗粒土与土工格栅加筋粗粒土的大型直剪试验为基础,分析其剪切应力-变形关系及粗颗粒含量对黏聚力平均变化率的影响,并研究了双曲线本构模型对粗粒土及加筋粗粒土的适用性.结果表明:粗粒土和加筋粗粒土剪切应力-变形关系曲线均为应变硬化型且明显呈现非线性关系,双曲线本构模型对粗颗粒含量大于18%的粗粒土以及粗颗粒含量小于33%的加筋粗粒土有较好的适用性,并得出了相应的模型参数.

Base on several large-scale direct shear tests which are under different direct stress, the shear strengthdeformationrelationship of coarse grained soil and reinforced coarse grained soil with distinct coarse materialcontent was analyzed. This paper analyzed the influence of content of coarse gains on average cohesion force changerate. It turned out that all of these relation curves were strain hardening and presented non-linear. The resultsshowed that the hyperbolic model had a better applicability for coarse grained soil when coarse material content isover 1 8 % and good for reinforced coarse grained soil when coarse material content is under 33%. The parameters ofhyperbolic model were obtained.