The resettlement of residents in the nearest possible areas is always applied in the Three Gorges Reservoir region

China. But engineering disturbances and heavy rainfall often induce the landslide instability. This paper discusses the impact factors and formation mechanism of the Jinjiling landslide in Jiangdong district

Wushan county

Chongqing

China. It shows that the cutting and filling of slopes lead to loading of the trailing edge and removal of material from the leading edge. More importantly

the filling of channels with surface soil blocks the surface water discharge channel along the landslide body

promoting the transformation of surface water into groundwater. Therefore the groundwater level in the Jinjiling landslide rose substantially under heavy rainfall

resulting in a large deformation on approximately August 1

2018. After emergency treatment

including groundwater pumping from the landslide body

the landslide deformation slowed considerably. It is analyzed that the groundwater rise caused by filling of the landslide body is the key factor of the landslide. The numerical simulation shows that the stability coefficient of the engineering decreases obviously after the disturbance of engineering

and the seepage field in the corresponding filling area changes obviously. The seepage is intensified

characterized as the increase in the pore water pressure

hydraulic gradient and total water head. Based on Darcy's law and principle of effective stress

the increase of seepage force and decrease of shear strength induce landslide deformation.