船坞双排钢板桩围堰施工过程的数值模拟分析

Numerical simulation for construction stage of double-wall steel sheet pile cofferdam in dock

为了得到船坞双排钢板桩围堰真实的受力特性,使用PLAXIS软件对其进行施工全过程数值模拟分析,得到了各个施工状态下的围堰的位移、钢板桩和拉杆的内力以及整体的安全系数,同时还考虑了施工过程的不排水情况和使用状态的排水情况。该方法计算结果比较全面,反映出常规设计方法偏于不安全,需引起设计人员的重视。该计算方法比较符合工程实际情况,为相似工程提供了有益的参考。

In order to interpret the real stress characteristic, construction stage of double-wall steel sheet pile cofferdam in dock is simulated by the soft of PLAXIS. The displacement of cofferdam, the internal force steel sheet piles and tie rods, and the safety factors are obtained. The undrained case in the construction stage and the drained case in the serviceable stage are also considered. This numerical analysis results are comprehensive and reflect the limitation of the conventional method. The designers should pay attention to this. This method agrees well with the practical engineering, thus may serve as a reference for similar projects.