| The buried piles are widely used gradually and considered as economical and practical retaining structure in landslide control engineering. At present, the questions such as the working principle of the buried piles reinforcing the landslide, the mechanism of sliding, interaction of pile and soil have not be resolved by the geotechnical engineers. The application and design of buried piles are still in the stage of based on experience or imitating the design method of normal stabilizing piles. This problem results in insecurity and seriously hinders the engineering application of buried piles.To start with the interaction of pile and soil in slope of being reinforced by buried piles, studying the anti-sliding mechanism of buried piles by physical modelling experiment, carrying out finite element numerical simulation analysis on the project example. In the end, combined with the field monitoring data of the buried piles, this paper analyses and studies the pile force condition, the influence on the slope stability of pile length changes, pile-soil interaction, the regularities of distribution of landslide pushing force on the pile. The main research work are as follows:1. Introducing the research progress about the buried piles both at home and abroad, including the research of stress calculation model, the indoor model experiment research of the buried piles, the distribution patterns of landslide thrust and resistant force of soil, pointing out that the buried pile can improve the structural behavior.2.Carrying out the indoor model experiment research, through the change law of displacement of slope surface, the earth pressure of slip mass in four groups of model experiment, analyzing the stress state of slip mass and buried pile, studying the change rule of slope displacement and landslide thrust when the pile length change.3. Using finite element numerical simulation method to analyze the Daduhui slope control project, with the method of finite element strength reduction, calculating the landslide thrust and its distribution patterns, slope safety factor, the bending moment and shearing force of pile when the pile length changes. Revealing the optimal pile length and optimizing struture design, indicating the change of length of pile can improve the distribution of internal force, and bringing the shear strength of slip mass on the top of pile into full play.4.Through contrastive analysis of the results of the finite element method and the traditonal computing method such as the transfer coefficient method, the foundation coefficient mehtod, evaluating the stress mechanism of piles and the slope stability of the Daduhui Project. Finally the design step of buried piles based on the finite element method is proposed by the author, the good applicability of buried piles is also demonstrated in the paper. |
