| With the high development of waterway transportation of our country, varieties of wharves are having been built, and the new type of wharf appears constantly. Flowing through the upstream area of Yangtze River is Mountain River, possessing the characteristics of large drop. In the place of broadside beach is suitable for Pierhead Pontoon. At present, most of the Pierhead Pontoons make use of traditional manpower or mechanical force to pull the steel approach bridge up and down. The way not only need men, but also is tedious, slowing down efficiency of cargo-handling.In this paper, combining the funded project of the key laboratory of education ministry of water conservancy water transport engineering, and relying on the Pierhead Pontoon of Hailuo of Chongqing, a new structural type of large drop pierhead pontoon is studied, which makes use of floating dock stuck with positioning pile to rise and fall. The most part of that is positioning pile, which joinssteel approach bridge and floating dock, its bearing performance directly influencing the safety of Pierhead Pontoon.The single-positioning pile is mostly adopted, due to the good basicgeology of the upstream area of Yangtze River.For that, Load value size applying onpositioning pile is analyzing firstly, and deformation and load effect at varieties of depth of single-positioning pile on condition of complex load is solved. This paper establishes a three-dimensional finite element model of coupled analysis of piles and soil, and soil around piles is used as constraints of the medium. At the same time,soil is discrete to a series of finite element linked through nodes.Andinterface element is made use of to simulateinteraction between pile and soil.Load effects at varieties of load values and water levels are figured out, which contains axial force of pile Ay,cross section bending moment of pile Mz and Mx, cross section shear stress of pile SFx and SFy, as well as horizontal displacement, in order to analyze the change rule of these eigenvalues from above to bottom of pile below soil, failure style and weaknesses, as well as to compare with the results got by m-method. At last, the paper probes control factors which influence the internal force of the model, as well as the sensitivity to the safety of pile structure. Studies have shown that the control factors influencing the bearing performance of pile, under complex load conditions, are pile diameter, relative stiffness of pile, frictioncoefficient between pile and soil and length of pile. Referring to these results, the structure style could be optimized to meet the requirements of the normal use of the Pierhead Pontoon structure. |
