Stability Evaluation And Anti-slide Pile Numerical Simulation Analysis Of Leshan Landslide

Serious geological disasters, landslides and earthquakes, floods, are listed as the three natural disasters worldwide. Landslides can lead to traffic problems, congestion and rural towns were buried, posing a huge harm to human life and property. China is a mountainous country, especially in the western areas and in the southeast coast such as Fujian, Guangxi, Guangdong, Hainan and other places. According to statistics, about 67% of the country is mountainous area, and landslide is quite frequent and numerous in the world. Leshan belongs to large landslide, and Leshan landslide reinforcement has important engineering significance and social benefits. This paper adopts the analysis of hydrological geological exploration, coefficient transmission method, finite difference numerical analysis and analytic hierarchy process(ahp). Main study includes four parts.1) This paper qualitatively analyzes the production mechanism of Leshan landslide. Through on-the-spot exploration, drilling, sampling, etc, this paper investigates the engineering hydrological and geological conditions, landslide main crack distribution of Leshan landslide and its characteristics. The conclusion is: geological condition is the main reason for Leshan landslide, and the 3~5 m high slope formed form landslide leading edge when building rural highway construction is the secondary factor.2) Coefficient transmission method is used to analyze the stability coefficient of the slope when there is no reinforcement in natural conditions, storms and earthquakes etc. And sensitivity analysis is carried out to stability coefficient under the influence of gravity, C and ?parameters. In natural state and seismic conditions, the landslide is stable as a whole, while in heavy rain and saturated condition, landslide is under unstable ~ basically stable state as a whole.3) Based on the analytic hierarchy process(ahp) method, technology, economy, safety and environmental factors, landslide reinforcement scheme evaluation system is established. And option is done to to Leshan landslide anti-slide pile reinforcement and anchor cable reinforcement through experts scoring.4) Based on the finite difference numerical analysis method, leshan landslide reinforcement focuses on anti-slide pile by large geotechnical software FLAC3 D numerical simulation. Systematic study of anti-slide pile spacing, pile diameter, pile setting position of the three key parameters of landslide sliding characteristics, distribution of plastic zone of slope body, Shear strain increment, slope segment point displacement and displacement of pile, pile body bending moment, shear force of pile. The main conclusions are as follows:(1) Pile distance mainly affects reinforcement ring size of the anti-slide pile and has some influence forced deformation of pile body;(2) Position setting of the anti-slide pile affects the maximum landslide slip of the anti-slide pile and plastic zone area of the peak and has smaller influence on pile body stress deformation;(3) Due to the inconsideration of calculation of the destruction of the anti-slide pile, and pile diameter mainly influences pile body stress deformation and the deformation reinforcement ring, and has smaller influence on the landslide. The greater the diameter of pile, the greater stress pile body is under and the smaller the deformation, the smaller reinforcement ring deformation as well.