大型深水板桩码头水平位移控制

Horizontal displacement control of large-scale deepwater sheet-pile wharf

针对传统板桩结构在大型码头应用中,尤其在大堆载、软土地基及深水环境下,呈现出水平位移过大的问题,采用PLAXIS 3D有限元软件进行模拟计算,分析造成板桩结构水平位移大的主要因素,制定有效的应对措施,并对比优化方案在不同水深环境下的水平位移。结果表明,在结构上采取卸荷措施、合理布置搅拌桩和旋喷桩、设置良好的排水通道、减轻后方回填料质量等4项具体措施使大型板桩码头位移得到有效控制,满足英标中的水平位移限值的要求,同时能带来相应的经济效益。

Aiming at the problem that the traditional sheet-pile structure presents excessive horizontal displacement in the application of large-scale wharf,especially for heavy load,soft soil foundation and deep water,we use the finite element software of PLAXIS 3 D for simulation calculation,analyze the main factors causing the large horizontal displacement of the sheet-pile structure,formulate the effective countermeasures,and compare the horizontal displacement of the optimized scheme under the different water depth environments.The results show that the four specific measures of unloading measure on the structure,reasonable arrangement of mixing pile and jet-grouted pile,setting up good drainage channel,and reducing the mass of backfill material can effectively control the horizontal displacement,meet the limit value of British standard,and bring corresponding economic benefit at the same time.