Research On Joint Reinforcement And Scheme Optimization Of Slope Anchor-cable Anti-sliding Piles

The anchor anti-slide pile used in slope retaining combines the anti-slide pile and the anchor cable whose advantages makes the force exerted upon the supporting structure be within more reasonable range,and it now becomes a common new type of supporting structure.At present,it is widely used in the supports of various slope projects,but few breakthroughs have been achieved in the theoretical study,leading to the situation that the theoretical study is far behind the engineering practice.In this work,by taking the soil slope on the west side of Changchong Mountain in Kunming as the research object,the soil slope was reinforced with anchor anti-slide piles and the slope stability was analyzed by the numerical simulation.The main research contents are as follows:(1)Through on-site investigation of the soil slope on the west side of Changchong Mountain in Kunming,the topography and hydro geological conditions of the landslide as well as the physical and mechanical properties of each layer of the landslide were understood.The relevant theories of the pre-stressed anchor anti-slide piles support slopes were grasped,thus,providing a theoretical basis for subsequent modeling.(2)By carrying out on-site sampling and indoor tests,the compressive modulus,cohesive force and internal friction angle of the soil body were determined through compression tests and direct shear tests,thus,providing physical and mechanical parameters for subsequent modeling.(3)The 3D slope model of the soil slope on the west side of Changchong Mountain in Kunming was established by employing Midas GTS NX finite element software.The four construction steps of the slope's anchor anti-slide pile support plan were defined as four different working conditions under which the slope stability was analyzed.The stability analysis was carried out for both the original slope under working condition 1 and the reinforced slope under working condition 4 when subjected to heavy rain,and it was found that the original slope under working condition 1 was prone to landslide,while the reinforced slope under working condition 4 was in steady state when subjected to heavy rain at the same time.(4)On the basis of the original reinforcement design plan,the anchor anti-slide pile support parameters were optimized to find a set of parameter combinations that could reduce construction investment and ensure the quality of slope reinforcement.The optimized plan was then applied to the practical project where radar satellite monitoring technology was used to study the reinforcement effect.It was found that the optimized scheme could still better control the settlement of the slope.