中文摘要：

针对深水承台所处的地质、水文、土质参数等情况,设计了密扣式拉森钢板桩FSPⅣ型围堰支护方法。根据钢板桩的实际受力情况,采用Midas-Civil三维结构软件建立双排钢围堰空间整体模型,并进行三维仿真验算分析。按钢板桩施工阶段不同,选取6种工况进行加载计算,对三种最不利工况引起的结构变形、钢板桩弯矩、支撑内力进行分析,通过数值模拟与施工过程中的位移监控,较好地预测了支护系统的动态变化趋势,确保了支护结构的精确性和安全性,达到满足工程施工需要、节省投资、缩短工期、提高社会经济效益的目的,也为其他类似工程提供应用参考。

英文摘要：

Based on the deepwater geological and hydrological conditions,and the soil parameters,a steel sheet pile cofferdam FSP IV supporting method of the closed button Larsen type is developed.According to the actual stress conditions of the steel sheet pile,the Midas-Civil software is used to establish the three-dimensional structure of the double-wall steel cofferdam in space and the three-dimensional simulation is carried out for the overall model to check the analysis.According to different stages of steel sheet pile construction,6 kinds of load conditions are selected in the calculation,and three most adverse conditions are analyzed with respect to structural deformation,the moments in steel sheet pile,and the brace forces,through numerical simulations and the monitoring of displacement in the construction process,to better predict the trends of the supporting structure and to meet the needs of construction,in view of saving investment,shortening the construction period,and improving social and economic benefits.