| Yisai village landslide is located on the north of rebuilding secondary roads inQinghai province Xunhua county, and on the east side of the landslide is a bridge, onthe west side is a village tunnel. On September4,2010, the overall deformationoccurred in the process of cutting excavation slope, Local excavation slope cuttingwas buried, Slope deformation seriously affected the course of construction safety.During the investigation of slope deformation tends to weaken gradually, but under theeffect of heavy rain and other adverse factors such as earthquake is still instability, it isa serious threat to the safety of pedestrians and vehicles, so the stability of thelandslide evaluation is Particularly important.According to the field survey data and the indoor experiment, this Paper analyzesthe internal and external factors of the deformation mechanism of landslide, thenrespectively using limit equilibrium method and numerical simulation method toanalyze the stability of the landslide evaluation, and puts forward reasonableSuggestions for landslide governance. In this Paper, there are some main results asfollows:(1) Based on the field survey and data analysis shows that the landslide ispull-type landslide, which is a Part of the ancient landslide, it is mainly caused byexcavation slope foot. So far the landslide is at a stable state, but under theunfavorable factors such as storms and earthquakes, still has the possibility ofbuckling failure.(2) Using the limit equilibrium method for landslide in nature, heavy rain andearthquake, the safety factor of the three conditions are known. Natural conditions, thelandslide is in stable condition, under the working condition of heavy rain andearthquake, the safety factor of the landslide are less than1.0, which is in the state ofunstable.(3) Numerical simulation analysis of the landslide is completed by FLAC3Dsoftware, we can get the displacement nephogram, shear stress nephogram, plasticlayout and so on under the three working conditions. The simulation analysis shows that in the natural conditions, sporadic plastic zone appears in the landslide leadingedge and trailing edge, but not through, so the landslide is at a stable state. In theheavy rain and earthquake conditions, there appears Plastic transfixion area in thegravel soil of the landslide, and the landslide can produce instability sliding along theweak side.(4) According to the results of on-site investigation and simulation calculation,put forward reasonable suggestions for landslide governance, using interceptingdrain，prestressed anchor cable anti-slide pile and prestressed anchor cable framescheme for comprehensive treatment. |
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