Application of Nonlinear Failure Envelope in Back Analysis for Shallow Rainfall Induced Slope Failure
Geotechnical engineers faced difficulties in proving a factor of safety less than unity for cases of shallow rainfall induced slope failure.It has been a common practice of elevating the ground water table in attaining a factor of safety less than unity despite there is no rise in the groundwater table especially in high ground.In fact the triggering factor in rainfall induced failures is the infiltration thus it is of great important to incorporate this in back analysis so that the true insitu conditions are replicated.Furthermore it has been a common understanding that the minimum shear strength of soil is when it is fully saturated whereas the strength can be further reduced when the soil is soaked.And this property of soil has never been accounted in design or back analysis of slope failure.Another common practice in analyzing stability is the application of the linear shear strength envelope with cohesion intercept by neglecting the fact that even clay has zero cohesion for drained condition i.e.to represent long term stability.Conducting tests at low stress levels has substantiated the absence of cohesion especially in tropical residual soils.Therefore the application of otherwise would be misleading and this could be the root of the problem of slope failure.The application of the above i.e.(1) infiltration type of analysis (2) non-linear failure envelope with zero cohesion in the investigation of three shallow slips in granitic residual soil in Malaysia will be presented and this is would verify the hypothesis.
shallow landslide rainfall-induced curvilinear envelope shear strength soaking
M.J.Md.Noor A.Rahman S. Hadi B.A.
Institute for Infrastructure Engineering and Sustainable Management, Malaysia 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
545-550
2014-06-02（万方平台首次上网日期，不代表论文的发表时间）