内部侵蚀砂土的三轴试验研究

由管涌等水土内部侵蚀作用产生的贯通侵蚀孔道是土体结构破坏以及边坡、水坝、堤防等失稳的重要原因之一.利用溶解土样中预制水溶性化学添加物的方法在三轴试样中还原内部侵蚀效果,结合弯曲元测试系统,探讨初始密实度、围压对侵蚀后土体力学参数的影响.研究结果表明:随着侵蚀过程的加剧,砂土的剪切波速逐渐降低,且降低幅度随围压和密实度的...

Triaxial Experiments on Sandy Soil Subjected to Internal Erosion

Internal erosion of soil resulted from piping, seepage or overtopping is found to be responsible for a large number of hydraulic structure failures. In this research, a method of preparing samples subjected to piping effect is achieved by dissolving water soluble material (glucose) in sandy soil. Qualitative impacts of initial density and confining pressure on the mechanical properties of the disturbed soil were investigated through triaxial compression tests and bender element tests under different initial densities and confining pressures. According to the test results, obvious reduction in shear wave velocity as well as peak shear strength was observed in the eroded specimen, and such reduction intensified along with the increasing of confining pressure and density, while residual strength appeared to be less affected.