基于粒子群算法的单壁钢围堰加固施工优化  

Optimizing Reinforcement Construction of Single-wall Steel Cofferdam Based on PSO

作　　者：钟正强 刘卓泽 彭建新 陈敬智 ZHONG Zheng-qiang;LIU Zhuo-ze;PENG Jian-xin;CHEN Jing-zhi(School of Civil Engineering,Changsha University of Science&Technology,Changsha Hunan 410114,China)

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410114

出　　处：《公路交通科技》2022年第7期90-97,共8页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(52078056);桥梁结构健康与安全国家重点实验室开放课题项目(BHSKL20-07-GF);长沙理工大学开放基金项目(15DK03)。

摘　　要：为了提高对单壁钢套箱围堰的经济和安全管控,结合某库区桥墩加固工程现有基础条件,对围堰结构设计中的主要参数变量进行优化,以改进深水区单壁钢套箱围堰加固施工工艺。根据深水区桥墩基础加固施工的主要特点,分析了钢套箱围堰的施工工艺流程,从钢套箱围堰的结构受力分析出发,建立了两种典型工况下的力学模型和优化数学模型,进而推导出最小抗浮稳定系数计算公式。在此基础上,通过ANSYS建立钢套箱围堰参数优化模型。将不同的内支撑间距和填充混凝土厚度设置成混合型变量,以材料费用、重量以及抗浮稳定系数为优化目标,选用粒子群算法对围堰进行了多目标优化,从而得出一组最优解。结果表明:对于支撑间距相等的围堰,在抽水工况下,当抽水至水位线以下空腔段1/3~2/5处时,围堰最不利受力变形位置出现,位于水位线以下空腔段3/5处;优化后的围堰在各工况下位移峰值为10.274 mm,整体最大位移下降了7.39%,峰值位置沿水深方向下移。优化后应力峰值为209.488 MPa,低于设计强度值。该结果验证了钢套箱围堰最不利受力变形位置出现的规律,避免了只考虑单一因素引起的局部优化,证实了粒子群算法应用于单壁钢围堰优化的实用性和有效性。In order to improve the economic and safety control of single-wall steel boxed cofferdam, based on the existing basic condition of a bridge pier reinforcement project in a reservoir area, the main parameter variables in the design of the cofferdam structure are optimized to improve the reinforcement construction technology of the single-wall steel boxed cofferdam in deep water area. According to the main characteristics of pier foundation reinforcement construction in deep water area, the construction process of steel boxed cofferdam is analyzed. Starting from the structural force analysis of the steel boxed cofferdam, the mechanical model and optimization mathematical model under 2 typical working conditions are established, and the calculation formula of minimum anti-floating stability coefficient is derived. On this basis, the parameter optimization model of steel boxed cofferdam is established by using ANSYS. Setting different internal support spacings and filling concrete thicknesses as the mixed variables, taking material cost, weight, and anti-floating stability coefficient as the optimization objectives, the multi-objective optimization of the cofferdam is carried out by using PSO,and a set of optimal solutions is obtained. The result shows that(1) for the cofferdam with equal support spacings, under pumping conditions, when the water is pumped to the 1/3-2/5 cavity section below the water level line, the most unfavorable force and deformation position of the cofferdam appears at the 3/5 cavity section below the water level line;(2) the peak displacement of the optimized cofferdam under each working condition is 10.274 mm, the overall maximum displacement decreased by 7.39%,and the peak position moved downward along the water depth direction;(3) the peak stress of the optimized cofferdam is 209.488 MPa, which is smaller than the design strength value. The result verified the rule of the most unfavorable stress and deformation positions of steel boxed cofferdam, avoided the local optimization caused by onl

关 键 词：桥梁工程 结构优化 粒子群算法 单壁钢围堰 深水基础 

分 类 号：U445.57[建筑科学—桥梁与隧道工程]