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对两种不同密度的某粗粒土进行了大三轴固结排水剪切试验,分析了粗粒土的应力-应变关系、强度及变形特性,初步探讨了反映剪胀程度的剪胀因子与三者之间的关系,对现有的一些适用于粗粒土的经验公式进行了验证。结果表明:粗粒土低围压下表现出应变软化和剪胀、高围压下表现出应变硬化和剪缩;高围压下最大主应力比和剪胀因子近似呈直线关系;粗粒土的抗剪强度包络线呈非线性,内摩擦角随剪胀因子的增加大致呈线性增加趋势,说明剪胀性的发生会增加粗粒土的抗剪强度;抛物线表达式能较合理地反映侧向应变与轴向应变之间的关系。
Three kinds of coarse-grained soils with different densities were subjected to a large triaxial consolidation drainage and shearing test. The stress-strain relationship, strength and deformation characteristics of coarse grained soils were analyzed. The dilatancy factor and The relationship between the three, some of the existing empirical formula for coarse grained soil validation. The results show that the coarse grained soil shows strain softening and dilatancy under low confining pressure and strain hardening and shearing under high confining pressure. The maximum principal stress ratio and dilatancy factor under high confining pressure have approximate linear relationship. The coarse grained soil The shear strength of the envelope is nonlinear, and the internal friction angle tends to increase linearly with the increase of the dilatancy factor, indicating that the dilatancy will increase the shear strength of the coarse grained soil. The parabola expression can reflect more reasonably Relationship between lateral strain and axial strain.