Research On The Genetic Mechanism Of Hazardous Rock Body Of Qianshan In Weicheng Town, Mao County, Sichuan

The Wenchuan Earthquake caused an infrequent damage in history,especially along the surface rupture zone,a large number of collapsed structures and geological disasters can be seen everywhere caused by surface permanent displacement.With the process of post-disaster reconstruction advancing,near the surface rupture zone,farmer-house reconstruction,as well as large industrial facilities, which are needed start from the field investigation of the Wenchuan rthquake surface rupture and the damage surrounding it,some aracteristics of seismic damaged buildings nearby the earthquake surface pture zone were described in detail.especially to avoid permanent displacement caused by seismic faults.So reasonable analysis of seismic hazard caused by surface permanent displacement is necessary.With continuous development of human being society,people's life is threatened by geologic hazards. For example:landslide,devolution,debis flow,ground slit etc of geologic hazard have being increasingly take place and intimidate people's life.Especially recent years,with rapid progress of westward opening up,geologic hazards more and more pick up which are influenced by facters of nature and human being.In this background,it is very important that fatalness of geologic hazards of WeiCheng Town, Mao County are estimated.Through large-scale engineering geological mapping, analysis of rock structure deformation coupled with the evolution of the relationship between valley. Such a conclusion can be drawn:(1) plastic deformation of carbonaceous phyllite lead to dumping of deformation of overlying strata in alternating hard and soft slope of the layered anti-dumping during the valley downcutting and took place loose in the earthquake. Parallel overhead surface tensile cracks formed, plus rock breaking, physical disintegration of rock collapse occurred gradually in this context after the earthquake.(2) Based on with emergency exporation after Wenchuan earthquake,by large-scale engineering geological mapping and drilling, the authors systematically investigated the accumulation body of Houshan in Weicheng town, considering that the accumulation body is an ancient landslide. The convest left bank in Weicheng used to be a consequent slope composed of metasandstone and phyllite before ancient landslide forming,under the role of the rapid river erosion in deep valley stage,the front part of the slope was cut into a steeply free face,under the action of the slope gravity,posterior edge of slope rupture and bedding slip,finally an ancient landslide happened. In this paper, Lizheng software was used to search for potential instability slip surface in the ancient landslide,calculation and evaluation on its stability show that the ancient landslide is active partly, but whole slope is stable.