| Landslide is the highest frequency of various kinds of geological disasters, the biggest loss of the type of disaster, So far, worldwide, which have inhabited the mountainous areas and engineering activities is almost always a landslide disasters. Landslide in China occupied a large proportion of geological disasters, particularly in the southwest of our country, for the people's production and life is a great deal of harm.In this paper, Wangya landslide is the research object based on the field geological survey, more comprehensive study of the engineering geological conditions of the landslide, slope structure characteristics, rock mass structure, slope deformation characteristics and so on. Landslide damage mechanisms established conceptual model, the use of the concept put forward FLAC3D program numerical simulation model. In-depth study of the deformation and damage mechanism, based on the limit equilibrium method using the deformation of the landslide body under different conditions was analyzed and evaluated the stability of the main factors affect the slope stability analysis of the sensitivity, and Creep deformation zone stability of retaining walls were calculated, based on stability analysis of various proposed the corresponding control measures. The following main results obtained:(1)By analysis the geological exploration Information and field survey, Wangya landslide in 1998 and 2002 by heavy rains occur after the edge of the tension cracks, signs of slope sliding occurred,"5?12" Seismic landslides and building there is a clear tension, dislocation deformation. Creep deformation zone in the "5?12" south of the earthquake in the nursery walls, the classroom level of the ground have different signs of deformation, especially in the south wall and classroom kindergarten classrooms were uneven ground settlement cracks. Landslides and earthquakes, heavy rainfall in the adverse conditions there will be sliding of the landslide.(2) According to landslide deformation and deformation of factor analysis, using numerical simulation, Numerical simulation using FLAC3D in heavy rain and earthquake deformation mechanism under the action of the numerical analysis. Analysis results show that:?①Sustained heavy rainfall is a predisposing factor in landslide deformation;?②Landslide deformation mechanism under the action of the storm showed significant posterior slope of the tensile damage, the slope with a certain edge and sliding shear deformation and the formation of the shear through the sliding surface, Landslides in the unstable under heavy rain;?③Downhill slide surface in the earthquake, occurred after the edge of plastic damage, local shear strain occurs through the landslide stability under earthquake is less localized stage.(3) Using the limit equilibrium method of landslide in the natural, natural and storm, natural and seismic stability conditions were analyzed and evaluated. The results show that the landslide is in stable condition in a natural state, the rainstorm conditions are less stable, less stable in the seismic conditions in the stable state to state.(4) According to creep deformation zone of the retaining wall, the deformation characteristics of the anti-slip on the retaining walls and overturning calculations, the results show that the stability of kindergartens in the south retaining wall due to steady state sliding, overturning of a stable state. Central Primary School playground south retaining wall of sliding and overturning are in a less stable.(5) This paper selected values c andΦof landslide, landslide and seismic saturated state of these factors on the stability of a sensitivity analysis,Φvalues obtained on the stability of landslide look Pass the greatest impact, followed by c, and saturated than the seismic force. |
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