金汇港南闸是一座集挡潮、除涝、应急通航、水资源调度等功能于一体的节制闸。水闸分3孔,闸孔净宽为15m+30m+15m,中孔孔跨30m,在类似工程中是罕有的,结构对闸首的沉降位移变形要求十分高。为准确分析闸首结构的沉降及内力,需统筹考虑上部结构、基础、地基三者间共同作用,且墙后高填土将产生一定的影响,常规的经验计算方法已经不能满足优化设计要求,本文通过岩土有限元分析软件Plaxis对工程进行了数值模拟,取得了理想的成果,对本工程的优化设计起到了一定的辅助作用。 The South Gate of Jinhui Port is a control gate that integrates functions of blocking the tide, removing waterlogging, emergency navigation and water resources dispatch. The water gate is divided into 3 holes, the gate width is 15m + 30m + 15m, and the hole diameter is 30m. It is rare in similar projects. The structural deformation and displacement of the gate head are very high. In order to accurately analyze the settlement and internal forces of the brake head structure, the interaction between the superstructure, foundations and foundations must be considered in an integrated manner, and the high fill of the back wall will have a certain impact. The conventional empirical calculation methods can no longer meet the requirements of optimal design, In this paper, the finite element analysis software Plaxis is applied to the numerical simulation of the project, and the ideal result has been obtained, which plays a supplementary role in the optimal design of this project.