Static And Dynamic Analyses Of The Characteristics Of Deformation And Internal Forces Of A Piled Wharf System

The piled wharf influenced by the lateral deformation action of slope soil because of the construction procedure that the slope is excavated in head and filled in back is a typical passive pile problem. However, the passive pile characteristic of piled wharf is not or seldom considered in anti-earthquake design norms in hand. The experience of damage cases of wharf in previous earthquakes shows that the cognition for the passive pile characteristic of piled wharf is not enough yet at present. So it is very necessary to discuss the anti-seismic property of piled wharf under the action of different influencing factors, based on considering the passive pile characteristic of piled wharf. At present, it is very difficult to be comprehensively and thoroughly analyzed for the anti-seismic issues of interaction system, individually depending on indoor or outdoor model tests and measurement techniques. Thus, due to well parameters extrapolation characteristic and flexibility for complex boundary conditions, the numerical simulation methods based on mature theoretical framework gradually became the effective research approach and main technical means of currently studying interaction system.Based on the characteristics and limitations of predecessors’ research achievements, the paper even more reasonably and thoroughly considers different factors which could influence the interaction between piled wharf and slope, such as the contact behavior of pile-soil interface, elastoplasticity of subsoil, and material nonlinearity of structure, and so on. And then, realistic numerical model and corresponding numerical compulation are built to thoroughly analyze the passive pile characteristic and anti-seismic property of piled wharf. Several conclusion remarks are drawn on the basis of computational results and theoretical analyses, which can provide referable experience to some extent for related engineering practice and design. The main part of research on piled wharf can be shown as follows:1. In simplified plane strain state, nonlinear numerical computation is conducted in the present work by developing elasto-plastic FE model for the interaction system of piled wharf and slope. Furthermore, in the computational model, employing Mohr-Coulomb failure criterion to describe the elastoplasticity of subsoil, and Coulomb contact pair theory with penalty algorithm to simulate the discontinuous behavior between piles and soil, the passive pile characteristic of piled wharf system under the condition of gravity is analyzed. And then, based on that, the parameterization analysis of factors influencing piled wharf under the common working condition is conducted. In the process, the internal forces and deformation characteristics of piled wharf are comparatively detailedly discussed, so are their response regularity at the time of varying the parameters of related factors. Further, considering the material nonlinearity of wharf structure, the cracks developing situation and plastic hinges distribution laws of piled wharf under the most unfavorable condition are researched.2. On the basis of former static analysis, the parameterization analysis of related factors which could influence piled wharf under seismic excitations is conducted, and at the same time the cracks developing situation and plastic hinges forming process of wharf structure in the seismic process are discussed.