Stability Analysis On Slope Supported With Anchors

The frequent occurrence of landslide in China causes great loses every year.Therefore, stability analysis and safety management of slope have always been major issues in geotechnical engineering and anchors are commonly used in landslide control project. However, the theoretical research on the stability of anchoring slope is still unmature. In this thesis, numerical simulation and three-dimensional limit equilibrium method were applied in stability analysis of the anchoring slope.The slope stability analysis was based on the Zhongjiawan deep cut slope in this thesis. Anchor load transfer mechanism and strengthening mechanism in anchoring slope was summarized with combination of the three-dimensional limit equilibrium method and numerical simulation. With the foundation of engineering geological data of Zhongjiawan deep cut slope, the slope calculation parameters was determined by parameter inversion.The numerical model which was used to calculate safety factor of the slope was established by pre-processing function of ANSYS and FLAC3 D. And slope stability was evaluated combined with the calculation results of three-dimensional limit equilibrium method. Anchor support scheme was designed on basis of evaluate results and anchor action mechanism and anchoring slope stability was evaluated. The influence of anchor parameters on the anchoring slope stability was analyzed.This thesis demonstrates that the failure began from the structural plane, in which the main destruction is shear failure, at slope toe before the tension-shear failure was formed at the slope top and eventually the plastic-zone arose in the slope. It is illustrated that anchors which penetrated structure surface formed a force system, and resulted in redistribution of internal stress which concentrated near the anchors, so that the security was improved. It is concluded that the higher the anchor bearing capacity the greater slope stability, and the higher the anchor inclination angle the lower slope stability, and the higher the anchor spacing the lower slope stability.