现代交通与冶金材料

为满足广珠段改扩建海隆大桥基础工程施工需要，提出一种锁扣双壁钢围堰。为探究锁扣双壁钢围堰力学行为与壁板厚度、壁体内钢管厚度、围檩位置及封底混凝土厚度四个构件参数的相关性，基于 Abaqus 有限元软件建立围堰模型并分析其应力和变形的变化趋势。分析结果表明：增加壁板厚度和壁内钢管厚度可以有效减小围堰壁体的应力和变形，壁板厚度从 6 mm 增加到 8 mm 时壁体应力降幅最大为 10.2%，钢管厚度从 8 mm增加到 12 mm时斜撑应力降幅最大为 10.82%。而对撑的应力和变形对围檩位置和封底混凝土厚度最敏感，随着围檩位置下移，对撑最大位移呈下降趋势，降幅最大为 67.09%。封底混凝土厚度从 0 到 1.5 m，对撑最大位移降幅最大为 27.19%。

To meet the construction requirements of the foundation works for Hailong Bridge on the Guangzhou –Zhuhai Expressway reconstruction and expansion project， a locked double-wall steel cofferdam is proposed. To investigate the correlation between the mechanical behavior of the locked double-wall steel cofferdam and four structural parameters， namely the wall plate thickness， internal steel pipe thickness， waling position and base concrete thickness， a cofferdam numerical model is established using the finite element software Abaqus to analyze the variation trends of its stress and deformation. The analytical results indicate that increasing the thickness of wall plates and internal steel pipes can effectively reduce the stress and deformation of the cofferdam wall. When the wall plate thickness increases from 6 mm to 8 mm， the maximum reduction rate of wall stress reaches 10.2%. When the steel pipe thickness rises from 8 mm to 12 mm， the maximum reduction rate of diagonal brace stress is 10.82%. On contrast， the stress and deformation of cross braces are most sensitive to the waling position and base concrete thickness. As the waling moves downward， the maximum displacement of cross braces shows a decreasing trend， with a maximum reduction of 67.09%. When the base concrete thickness increases from 0 m to 1.5 m， the maximum displacement of cross braces drops by up to 27.19%.