Role of Soaking in Rainfall-Induced Slope Failure according to Nonlinear Failure Envelope
Slope failure caused by surface water infiltration is common in tropical countries.When water infiltrates into slope the magnitude of suction diminishes, and in turn shear strength also reduces.At zero suction the shear strength envelope correspond to the shear strength at saturation which is commonly thought as the lowest shear strength.Analysis proved that many slopes are still stable even though being infiltrated to the failure depth and this has puzzled the engineers of how the slope has failed.This paper will substantiate that the lowest shear strength is not the shear strength at saturation.The shear strength envelope is further lowered when the soil with clay minerals in its constituent is soaked.This has been the common triggering factor in slope failure caused by rainfall infiltration and never being incorporated in slope design.A case study of a slope failure in tropical sedimentary residual soil in Malaysia will be presented where unsoaked and soaked consolidated drained triaxial tests have been conducted for soaking period of 7 and 14 days.And stability analysis applying linear and non-linear failure envelope have been conducted and compared.
multistage shear strength unsoaked infiltration
M.J.Md.Noor A.Rahman S.
Institute for Infrastructure Engineering and Sustainable Management, Faculty of Civil Engineering, University Tekologi MARA, Shah Alam, Malaysia
国际会议
World Landslide Forum 3(第三届世界滑坡论坛)
北京
英文
551-556
2014-06-02（万方平台首次上网日期，不代表论文的发表时间）