Rainfall type landslide risk early warning threshold system establishment method based on geological environment

The invention provides a geological environment-based rainfall type landslide risk early warning threshold system establishment method, which comprises the following steps of S1, constructing a threshold model: S2, analyzing a rainfall threshold inducing landslide disasters by adopting the rainfall threshold model so as to determine a regional slope reference threshold RS; s3, slope geological environment factors playing a control role in the area are selected according to a slope deformation damage mechanism; s4, depicting a reference slope of the whole area according to the selected slope geological environment factors; and S5, slope stability changes caused by each slope geological environment factor of the reference slope under different rainfall conditions are determined by using a numerical simulation method, and threshold adjustment variations delta Ri brought by each slope geological environment factor in different durations are obtained, so that a threshold system is established. The method has the b