中文摘要：

通过垃圾土的三轴固结排水剪切试验结果,研究了垃圾土的抗剪强度机理,纤维材料在压缩剪切过程中产生的拉力是垃圾土抗剪强度得以提高的关键所在。基于试验结果,提出以垃圾土应力-应变关系曲线的硬化点作为破坏标准来计算垃圾土的强度参数,这样可确保垃圾土强度参数的唯一性,又可避免因选定的应变水平较小而低估垃圾土的强度,得到本文垃圾土的黏聚力为71.3 k Pa,内摩擦角为35.9°。最后,提出了新的描述垃圾土应力-应变关系的非线性模型,该模型能够反映小应变和大应变情况下的非线性,克服了已有线性和非线性模型的缺陷,能够很好地吻合试验数据。

英文摘要：

The conventional triaxial compression tests were carried out for municipal solid waste （MSW） under consolidated drained conditions. The shear strength mechanism of MSW is also investigated. The development of the tensile stress of the fiber materials plays a key role in improving the shear strength of MSW during the shear test. Based on the stress-strain curves of MSW, the strength parameters of MSW are calculated by using the stress state at a hardening point as the failure criterion. The cohesion and friction angle are 71.3 kPa and 35.9°, respectively, for the MSW used in this paper. Finally, a new non-linear model was proposed to describe the stress-strain responses of MSW. This model can reflect the non-linearity at small and large strains to fit the MSW test results well, which can overcome the defects of the existing models reported in published literatures.