遮帘板桩式接岸结构桩土相互作用分析*

摘要

Based on a project, we carry out a numerical analysis for the pile-soil interaction of the blind sheet-pile bank connecting structure. We also study the effect of the calculation parameters on the pile-soil interaction. When the blind sheet-pile suffers the rear earth pressure, the earth pressure among the sheet-pile passes to both sides of the barrier piles, so that it reduces the earth pressure bore by the front piles which produces the soil arching effect, and improves the bearing capacity of the bank connecting structure. It is found that the soil cohesion and the internal friction angel have greater impacts on pile-soil interaction. With the cohesion and internal friction angel increase, the load-bearing of blind piles also increases, and finally tends to a stabilized value. When the cohesive reaches to a certain value, the internal friction angel has a less impact on the pile-soil interaction. In order to make an optimal design, we must make a comprehensive consideration about not only the span of the blind pile but also the span between the blind pile and the front row pile. It can be used as a secondary factor when designing the bank connecting structure of the blind sheet pile, because the soil elastic modulus, Poisson’s ration and the coefficient of friction of the pile have small effects on the pile-soil interaction.%　　结合某工程，对遮帘板桩式接岸结构桩土相互作用进行数值分析，研究了桩土相关计算参数对桩土作用的影响。由于遮帘桩的存在，在受到后方土压力时，遮帘桩桩间土压力向两侧遮帘桩传递，这样减小了前排桩承受的土压力，产生土拱效应，提高了接岸结构的承载力。土的粘聚力与内摩擦角对桩土相互作用影响较大，随着粘聚力与内摩擦角的增加，遮帘桩荷载承担比均有所增加，最后都趋于稳定值，当粘聚力达到一定值时，内摩擦角对桩土相互作用影响较小。遮帘桩间距及遮帘桩与前板桩间距对桩土作用影响较大，只有综合考虑，才能优化码头设计。土的弹性模量、泊松比、桩土摩擦系数对桩土相互作用影响较小，在设计时可作次要因素考虑。