ANALYSIS OF THE TYPE AND MECHANISM OF WATER SUPPLY FROM FAULT STRUCTURE ON LANDSLIDE

Large and complex landslides are often rich in groundwater due to the hydraulic recharge of fault structures. Regional hydrogeological conditions mainly control the water supply of fault structure, and have the characteristics of stable water quality and quantity, which has a great and long-term influence on the stability of landslide. At present, there are few studies on the effect of fault structure on the water supply of landslide, and there is no systematic study on the type and formation conditions of fault structure on the water supply of landslide. This paper studies the typical example of water supply landslide in fault structure, according to the distribution location of the fault structure, the mechanical properties, the way to recharge the groundwater of the landslide and the hydraulic connection. Fault structure causes on the water supply types of the landslide are divided into three types: boundary supply type, sliding bed supply type and compound type. Four mechanisms of groundwater action on landslide are analyzed, including increasing pore water pressure in the sliding zone, lifting of confined water in the sliding bed, sliding zone clay minerals swell with water, and sliding zone chemical dissolution. The research results have important guiding value for revealing the law of groundwater migration, quantitatively evaluating the effect of groundwater on landslide, and reasonably determining the design of interception and drainage of groundwater.