| h-type retaining structures is widely used in engineering practice. In this paper, a slope is taken as an example in Ningde. A basic computational model is designed by PLAXIS, which is used for analyzing the working mechanism. Hardening soil mode is used to reflect the properties of soil under load-unloading.Considering interaction of pile with soil, interface element is to simulate pile-soil interface. The performance of h-type retaining structure and the potential failure mode of slope under different parameters are researched.Firstly, PLAXIS software and finite element theory is introduced, the characteristics of the material model is concluded. According to the advantages and disadvantages of different constitutive mode, it decided to adopt Hardening soil model, which is expanded the relevant model introduction. At last, Strength reduction principle is elaborated in detail.Secondly, according to the result of calculation model, the performance of the front and rear piles are discussed. Calculation model of single double-row piles and the portal double-row piles are established to compare with h-type retaining structure, so that further reveals the mechanism of the h-type retaining structureThirdly, to analyze the performance of h-type retaining structure, the influencing factors are studied, which is includes the pile diameter, the row spacing, embedment of the pile, rigidity of the linkage, inclination of the linkage, node connection of the linkage, cohesion of the soil, friction angle of the soil and modulus of the soil. Suggestions of optimization are then put forward.Fourthly, Phi-c procedure of t PLAXIS is reasonable for stability analysis of the slope, it can detailedly describe the potential slip surface of slope under different influencing factors, which is includes the pile diameter, the row spacing, embedment of the pile, rigidity of the linkage, inclination of the linkage, node connection of the linkage, cohesion of the soil, friction angle of the soil and modulus of the soil. Simultaneously, the relationship between influencing factor and safety factor is summed up.Fifthly, according to geological exploration report and investigation for engineering geological conditions, it can know about the engineering geology characteristic and the surrounding environment in the study area, which is good for reasonable simplification of computational model. Monitoring results, which is compared with the finite element simulation results, verify the retaining effect of h-type retaining and the reasonableness of the finite element model and parameters.Finally, it summarized the primary content of the thesis and the research achievements. Meanwhile, it prospected the suggestions for the near future work. |
