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结构性土具有与重塑土不同的力学特性,为了探讨胶结和孔隙比等物理因素对其影响,该文对具有不同胶结强度和干密度的人工制备结构性土以及相应的重塑土进行了对比常规三轴试验。试验结果表明,胶结可“滞后”土体的变形,使得结构性土在等向压缩条件下的e-lgp曲线发生转折。结构性土的破坏随围压的升高可依次出现纵向劈裂、剪切带和均匀剪切破坏等3种方式。胶结和孔隙比使得结构性土的变形模量和体变变化规律与重塑土差异很大,同时对结构性土的应变软化和剪胀特性也有显著影响。
Structural soil has different mechanical properties from remodeled soil. In order to investigate the influence of physical factors such as cementation and void ratio, artificial structured soil with different cementation strength and dry density and corresponding remolded soil Contrast to conventional triaxial test. The experimental results show that the deformation of soil with “hysteresis” can result in the transition of e-lgp curve of structural soil under isotropic compression. With the increase of confining pressure, three kinds of methods of longitudinal splitting, shear banding and even shear failure can occur in turn. The cementation and void ratio make the deformation modulus and volume change law of structured soil vary greatly with remolded soil, and also have a significant effect on the strain softening and dilatancy properties of structural soil.