Geological hazard susceptibility assessment in thick loess and gob

Distribution area of thick loess in Tongchuan City is cut by valleys, broken gully and gully loess, loess landslide and rock fall hazard develop extremely; also located in Weibei coalfield, coal mine goaf has caused many geological hazards such as ground fracture and collapse. The interaction of the two aggravates the occurrence of urban geo-hazard. Through 1:50 000 environment geological survey in Tongchuan City, based on information model, the evaluation index system of loess landslide, collapse and goaf deformation was established. The index of evaluation of geo-hazard susceptibility in complex area is divided into ground index, underground index and environmental factor index, the weight of index is 0.3, 0.3 and 0.4 respectively, after GIS analysis and calculation, we try to solve the complex and incompatible factors of disaster-causing factors in the evaluation of geological hazards. And it is considered that in the thick loess of coal-mined-out area, because of the existence of collapsible loess, the surface deformation is sensitive to the mining depth-thickness ratio, and the norm deformation characteristic value is clearly small.