The mountainous areas of Guizhou have complex geological environments,and landslides in waste disposal sites are not uncommon.Based on the landslide of a temporary waste disposal site on the right side of the filling roadbed of a highway in Guizhou Province after continuous heavy rainfall,through on-site geological investigation,engineering geological analysis,and the construction of a ge-ological model,numerical simulations were carried out to analyze the landslide mechanism of the waste disposal site.The results showed that the waste disposal site was covered with a thick layer of silty clay,and the waste was disposed of without cleaning.As a result of poor drainage and severe water collection in the valley,the silty clay base and slope foot hills were soaked after rainfall,forming a soft foundation that could not withstand the huge sliding force caused by the unreasonable filling of the upper waste,resulting in catastrophic landslides due to shear damage.The lower sliding surface was a linear sliding surface controlled by the strongly weathered limestone surface,while the middle and upper sliding surfaces were arc-shaped sliding surfaces controlled by homogeneous waste material.
spoil ground with weak foundationslide failurenumerical simulationinstability mecha-nism
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