基于流变学和型砂微变形理论 ,研究了湿型砂的粘塑性 ,对湿型砂的粘塑性本质进行了分析 ,并对反映型砂粘塑性的性能指标———塑变临界值进行了检测和试验研究 ,考察了膨润土含量和紧实率对塑变临界值的影响。还对标准砂样抗压测试过程的本质特征曲线进行了分析 ,认为 ,可将砂样抗压变形过程分为粘弹性变形、粘塑性变形和砂样破裂三个阶段 Based on the theory of rheology and sand micro-deformation, the viscoplasticity of wet sand was studied, the viscoplastic nature of wet sand was analyzed, and the critical value of plastic deformation, which is the index of viscoelasticity of sand, was tested and tested The effects of the content of bentonite and the compaction rate on the critical plastic deformation were investigated. In addition, the essential characteristic curve of standard sand sample compression test is also analyzed. It is considered that the compressive deformation process of sand sample can be divided into three stages of viscoelastic deformation, viscoplastic deformation and sand sample rupture