Finite Element Analysis And Optimum Design Of Portal Water Injection Sheet Piles

The domestic and abroad research about retaining structure with double-row piles is summarized, and its disadvantages are shown in this paper. Two-dimensional nonlinear plane-strain Fern analysis, which emphasizes the pile-soil interaction, is developed for portal water injection sheet piles with the software Ansys. Because of the different material property of the piles and soil, shear stress is produced on the contact surface between piles and soil, which may cause slide and crazing of the soil mass under workload. In order to reflect the mechanical character precisely on the contact surface, a new kind of element, plane-plane contact element is introduced. The principle of the process is presented in detail and the finite element model is established with the consideration of the soil's elastoplastic constitutive relation. Compared with the examination results, the theoretical calculation results with finite element method demonstrate the feasibility of the contact element.With an engineering example, the influence of many material factors on piles deformation and contact stress of portal water injection sheet piles has been discussed. Based on the numerical results, an optimum design model, which considers the maximal deformation of the piles as objective function, is put forward with the computer language APDL provided by Ansys program. Finically, the dynamic property of portal water injection sheet piles is analyzed in this paper, and the influence on dynamic property of pile length and distance between piles is discussed in detail. Some valuable conclusions have been reached, which can do something useful to engineering practice.