海上悬索桥锚碇地下连续墙钢导墙三维数值分析

3D numerical analysis on steel guide wall of underground continuous wall for anchorage of cross-sea suspension bridge

海上悬索桥锚碇地下连续墙的钢导墙结构复杂,在施工过程中受台风和海浪影响大,这给钢导墙的设计和施工带来了巨大困难,常规简化计算难以对结构的受力和变形进行精准分析。为了准确分析地下连续墙钢导墙施工方案的可行性和可靠性,以深圳-中山通道工程跨海大桥悬索锚碇地下连续墙的钢导墙为例,建立“钢导墙—地基”三维有限元数值模型,运用数值仿真方法,按照施工顺序分别对插打钢导墙情况、地连墙铣槽情况和地连墙浇筑情况进行了数值模拟,分析了钢导墙的变形和应力,并就控制工况对钢导墙方案进行了优化。结果表明:施工过程中,钢导墙的变形和应力较小,且在弹性范围内,满足设计要求;钢导墙两侧水泥搅拌桩排数取5排时较为合理,搅拌桩数量可节省1/6。

The steel guide wall structure of underground continuous wall of suspension bridge anchorage is complicated, and greatly affected by typhoons and waves in construction, which brings great difficulties to the design and construction, and conventional simplified calculation is difficult to accurately analyze the force and deformation of the structure. For accurately analyzing the feasibility and reliability of the guide wall construction scheme, taking a suspension bridge as the case, the "steel guide wall-foundation" three-dimensional finite element numerical model was established. According to the construction order, installation of a steel guide wall, the wall slot milling condition and even the wall casting conditions were respectively simulated using numerical simulation method, the displacement and stress of steel guide wall were analyzed. According to the simulation results of the controlling conditions, the construction scheme of the steel guide wall was optimized. The results showed that the deformation and stress of the steel guide wall were small and met the design requirements within the elastic range. It is more economical and reasonable to have 5 rows of cement mixing piles on both sides of steel guide wall, the mixing piles numbers can be saved by 1/6.