Preliminary Mechanism And Stability Evaluation Of Landslide's Formation And Old Landslides Locally Revived By The Activities Of Confined Groundwater

Landslide which appears when sediments slides along subterrane is very common in the upsream of Jinghe River and eastern Liupanshan.In the aspect of precipitating factor,existing research results always focus on the effect of metamorphic water and it's infiltration,however,under the local geological environment background,the rising of confined groundwater during the structural fracture may steply soften and slime the layers which is around the aquifer,and finally become the key factor of landslides formation and old landslide locally revived.Taking the north-mountain landslides of Jingguang primary school for example,this article evaluats the landsild's stability based on Limit Equilibrium Principle,also performs comprehensive analysis in engineering geological aspect,using many methods such as data collecting,field survey,engineering geological mapping,and engineering geological prospecting.In consideration of infiltration of confined groundwater,the numerical simulation is also carried out.Finally,the following conclusions are mainly obtained:(1)In terms of the mechanism of landslide formation,the rising of confined groundwater during the structural fracture may steply soften and slime the layers which is around the aquifer,finally become the key factor of landslides formation and old landslide locally revived;(2)Numerical simulation of groundwater seepage which is carried through a solfware named by“Geo-Seep”,and give a preliminary interpretation about the influence mechanism of slip deformation which is caused by the rising of confined groundwater during the structural fracture;(3)Afte reevaluating about the stability of landslide,considering the confined groundwater during the structural fracture,this article point out,north mountain landslide of Jingguang primary school is in an unstable state,it can threat the safety of life and property of most of the residents of jingguang village,which must be taken seriously.Landslide hazard may appear as new landslides formated and old landslide revived.