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对2种粗粒土4种级配料进行了卸载–再加载的三轴固结排水剪试验,比较分析其强度变形特性与单调加载三轴试验条件下特性的差异。重点研究不同试验粗粒料的回弹模量取值规律,分析了回弹模量与初始模量、围压和应力水平等之间的关系。结果表明,围压对回弹模量影响较大而应力水平的影响相对较小;粗粒土的回弹模量约为初始模量的2.5～5.0倍,比目前对黏土等认识的1.5～3.0倍明显大。试验结果为邓肯–张模型等非线性弹性模型甚至弹塑性模型的回弹模量的合理取值提供了重要试验依据。
Two kinds of coarse soil four kinds of ingredients were unloaded - reloading three-axis consolidation drainage shear test, comparative analysis of the strength deformation characteristics and monotonous loading triaxial test conditions under the characteristics of differences. The research on the value law of the rebound modulus of coarse aggregate in different experiments is focused on, and the relationship between the elastic modulus and initial modulus, confining pressure and stress level is analyzed. The results show that the influence of confining pressure on the modulus of elasticity is relatively large and the influence of stress level is relatively small. The modulus of elasticity of coarse-grained soil is about 2.5-5.0 times that of the initial modulus, 3.0 times significantly larger. The experimental results provide important experimental evidences for the reasonable values of the elastic moduli of nonlinear elastic models such as Duncan-Chang model and even elastic-plastic models.