The Mechanisms And Applications Of Slope Reinforcement By Considering The Stiffness Effects Of Anchors

With the rapid development of geotechnical engineering, the anchorage techniques now are applied widely to treatment engineering of landslide, and obtained good effects. How to give full play to anchorage potentials of anchors is an important problem for anchorage techniques. The anchor proposed in this thesis is a kind of anchor with certain bending stiffness which can effectively improve the shear strength of slope sliding surface. This anchor solved the problem of weak shear strength of traditional anchors, and achieved actual application and certain promotion in the landslide reinforcement treatment project. The thesis regarded this kind of anchor as research object, considering its stiffness effects, and made a certain research on mechanisms and applications of slope reinforcement based on the methods of theoretical analysis and numerical model test. The main research work done in this thesis consists of the following parts:(1) According to slope failure mechanisms, the mechanical properties of slope sliding surface, and the impacts of anchoring on distribution shape and shear strength of slope sliding surface were analyzed. Through numerical shear test, study on the mechanical properties' changes of sliding surface after being anchored was conducted, and the impacts of setting angles, thickness of sliding surface on test results were analyzed. The research showed that this kind of anchor can effectively improve the shear strength of sliding surface, and when setting angle was around 40°, anchoring effects were the best.(2) Considering the energy dissipation, velocity field of slope reinforced by anchors in limit state was built, and safety factor of slope based on strength reduction method and gravity loading method was respectively defined according to virtual work equation of limit analysis of plasticity, finally the design theorem of anchors based on upper bound analysis was proposed, and optimization of anchorage angle and anchorage length was also analyzed.(3) Based on strength reduction technique, through numerical analysis and calculation with software, slope stability analysis was conducted, and the impacts of deformation parameters, friction angle, cohesion, constitutive models, reduction methods, anchorage parameters and different arrangement modes on results were also analyzed.The studies of this thesis will provide certain theoretical basis for mechanism analyzing, design method and application promotion of anchors when considering the stiffness effects.