The Jiangdingya landslide presents multiple reactivation sliding,and the deformation and fail-ure mechanism is extremely complex.The deformation and failure mechanism of the landslide was stud-ied by means of a physical model test,theoretical analysis and finite element numerical simulation,show-ing that,under the condition of 50 mm/h rainfall,cracks first appeared in the lower part of the landslide.As rainfall continued,the cracks extended to the middle of the landslide,and the leading edge collapsed locally.Moisture content monitoring showed that the rainfall infiltration rate in the front of the landslide was 5.56×10-4 cm/s.After the formation of cracks in the lower part of the landslide,rainfall infiltrated and softened the sliding zone along the cracks,resulting in a decrease in the shear strength of the sliding zone soil and the traction failure of the landslide.After 2 hours of rainfall,the soil pressure of the upper sliding zone began to decrease continuously,indicating that the shear strength decreased to the critical val-ue of landslide sliding,resulting in an overall creep deformation of the upper part of the landslide along the sliding zone.The failure mechanism of landslide was as follows:in the initial rainfall,the infiltration into the slope surface was slow,mainly due to the inflow of pores.The existence of cracks provided infil-tration channels for the rainfall.A saturated zone was formed on the contact surface between the gravel soil and carbonaceous slate debris,which increased the pore water pressure inside the landslide and re-duced the shear strength of the carbonaceous slate in the sliding zone,resulting in a reduction of the anti-sliding force of the sliding zone and the reactivation.
deep accumulation layerancient landsliderainfallindoor model testfailure mechanismJiangdingya
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