Study On Evolution Of Slope Deformation And Typical Landslides In Shuiyin River, Longxian County, Shanxi Province

This article is connected to geological investigating project ,Detailed Investigation of Geological Hazards In Baoji Region,Shanxi Province ,which is sponsored by China Geological Survy (CGS), and is finished under the instruction of instructing adviser. On the basis of collecting predecessor's studying results, by ways of field research, indoor examination analysis and FEM numerical simulative calculation, the author use multidisciplinary theories and methods, focusing on mutual evolution among slope deformation,gully and landslides. Such preliminary results and new principal progress is made as follows:1. Preliminarily analyzed types and distributing characters of geohazards in Longxian County.Considering occurring conditions and affecting factors of geohazards,the author divided slopes into four main types:loess slope,rock slope,terrace slope and loess-rock slope,counting on twelve minor types.Of all above,slipe type prone to landslides is loess slope and loess-rock slope,and slipe type prone to landslip is high and steep loess slope.2. Based on field surveying of slope portrait section ,the author studied"drunk men woods"on representative landslides and deforming slopes."Drunk men woods"is usually considered as a kind of symbol of landslide. Mapping geological hazards in BaoJi,ShanXi province,we found"drunk men woods"exist in deforming slopes at large extent.By way of measuring sloping angle of wood in guojiazhuang deforming slope in Longxian county and slope angle ,and analyzing geometricly ,we think sloping angle of wood reflect variation of slope angle,and drew the conclusion that enlargement of slope angle is the main type of slope deforming.Research show that"drunk men woods"have multiple concreat indications,and have important role in research of landslide and deforming slope.3. Slope deformation in Longxian County has two main types: one is portrait deformation of slope, which form crag cliff and stepping slope surface; the other is landscape deformation of slope, which form a series of anticline and syncline like waves in slope surface.4. On the basis of studies on Shuiyin river, Guojiazhuang slope and Lijiaxia slide group, the author made such preliminary conclusions: gully has extinct control on slope deformation, on the other hand, slope deformation affect growth of subgully. Two sides have complicated coupling relation. Slope deformation and growth of gully change physiognomy of slope at a large extent, make slope from state of stability to state of unstability, which is prone to landslides.5. FEM numerical simulative calculation was made to study Guojiazhuang slope and Lijiaxia landslide, original state , firstly deformation, secondly deformation and forcast of future are considered. Simulative results showed that firstly, direction of hinge line of surface syncline is the predominant direction of subgully, basicly control the growth of subgully, and direction of slope cliff and subgully intersect at degree of about 90; secondly, growth of subgully affect slope deformation, and new slope deformation occur around new gully.