Three dimensional back analysis for stability of slope dumped on weak basement
WANG Jiachen
CHEN Chong
Abstract：To investigate the failure model of slope dumped on weak basement,a waste dump at an open-pit iron mine was taken as background.The ranges of the shear strength parameters of clay basement were estimated through triaxial shear test and in situ direct shear test.A three dimensional numerical model of dump slope was established,the basal clay strength parameters were gradually reduced based on strength reduction technique,reasonable clay shear strength parameters were obtained when the slope was in the state of limit equilibrium state.The evolution of slope failure was simulated by three dimensional back analyses.The results show that " Y" type sliding surfaces are developed in weak basement and internal dump slope,and sliding mass is divided into upper active wedge and lower passive wedge,a two-part wedge failure mode is finally formed.Simulation results can reflect the three dimensional effect of the sliding and are consistent with the results of field investigation.
Keywords：weak basementwaste dump slopetwo-part wedge failureback analysis
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 474-479 )