| China is one of the countries whose natural disaster is frequently occurred due to the complicated conditions of terrain and geological, especially for landslide. Luanshigang landslide in Han Yuan is used to be the subject. Depended on the systemic analysis of venues regional geological structures, geotechnical structural features and deformation characteristics, the stability of landslide is calculated. According to the feature of landslide, prevention and treatment measures of landslide are obtained, and then monitoring data of governed landslide is systematically analyzed. Conclusions which are obtained in this paper are as follows:(1) Based on the view of regional structural point, Luanshigang landslide is located in the western of Emei Mountain and Wa Mountain fault block, and in the southwestern wing of Hanyuan syncline. Intense fold and regional active rupture are not existed in the area of landslide which is a monoclinal tectonic province with slope down to northeast. Due to the influence of circumjacent structure, attitude of bed in different section is changed in the research area, such as the relieve undulating of stratum, geological structure trail features that with secondary fold, minor fault, Layer dislocation and jointed system.(2) Luanshigang landslide is developed in the late Ordovician, which consisted of thin-middle fine sandstones that interbedded with argillaceous siltstone, silty claystone and mudstone, and whose attitude of bed is N30-38°NE∠13-16°. Slip band is weak interlayer which constituted with weak claystone and mudstone.(3) The scale of Luanshigang landslide which with1000m extreme breadth and length, is huge. The landslide volume is almost500×104m3with thickness of8～20m. Depended on the difference characteristics of structure and deformation of rock mass between landslide area and circumjacent region, Luanshigang landslide can be divided into two areas as accumulation area and influence area of landslide. Additionally, the influence area of landslide can be further divided into four zones, such as weak pull loose split zone, strong Liela crack loose deformation zone, crack relaxation deformed zone and overlay accumulation zone.(4) Several weak structural planes are developed in the rock mass which are consisted of sand-mudstone in the downslope of research area, that belong to the bottom interface of landslide and cause the slope destabilization which is related to free surface of the sliding body, strength of the weak structural surface, surface water bodies, regional structure and earthquake.(5) Luanshigang landslide and deformable body is at stability state in natural condition, major of it is at approaching stability state in rainstorm condition and earthquake condition, while locality of it is at ultimate equilibrium state that may cause destabilization.(6) Friction pile and anchor anti-slide pile are applied in the treatment measure of Luanshigang landslide influencing area, while anchor wall and framework anchor are employed in the regional area.(7) According to the monitoring achievements, Luanshigang landslide is at stability state after gestion. whose evaluation of stability is factual, and whose engineering treatment measure is feasible. |
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