Analysis of the soil arching effect under pile-soil coupling for a landslide in the Three Gorges Reservoir Area based on three-dimensional numerical simulation

摘要

Deflection of stress direction occurs near anti-slide piles, forming obvious soil arches with adjacent piles as springers and creating the "soil arching effect". Based on the stress conditions for anti-slide piles, a mechanical analysis is conducted on the soil arching effect, and three rational equations are concluded, namely, the arch axis equation, the soil arch thickness equation, and the theoretical equation of soil arch thickness along the sliding direction. Combined with one landslide in the three gorges reservoir area, numerical analysis model is established, the landslide displacement and shear stress calculation results show that the pile has obvious slip resistance effect, the piles and soil coupling to prevent sliding. Three-dimensional numerical analysis was carried out on the pile, the intuitive "soil arching effect" be found from the anti-slide pile and soil. The soil arch thickness and height of anti-slide pile can be determined according to the soil sliding thrust and the theoretical formula that combines three dimensional numerical analysis for the soil arch effect, which can provide references for the anti-slide pile design and achieve the goal of safe and economic to prevention and control the landslide.