《工程(英文)》 >> 2023年 第20卷 第1期 doi: 10.1016/j.eng.2021.07.028
港珠澳大桥大直径钢圆筒多振锤联动安装的可打性
a Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Kowloon, Hong Kong 999077, China
b The Hong Kong University of Science and Technology Shenzhen Research Institute, Shenzhen 518057, China
c Tianjin Port Engineering Institute Co., Ltd. of CCCC First Harbor Engineering Co., Ltd., Tianjin 300222, China
d Key Laboratory of Port Geotechnical Engineering, Ministry of Communications of People's Republic of China, Tianjin 300222, China
e CCCC First Harbor Engineering Company Ltd., Tianjin 300461, China
f AECOM Asia Company Limited, Hong Kong 999077, China
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摘要
港珠澳大桥人工岛采用八振锤联动的方式将120 个直径22 m、最大重量531 t 的钢圆筒围堰打入海床,最大嵌入深度达33 m。由于缺乏相关工程经验,多锤联动下大直径钢圆筒的振动打入速率和安装时间的预测是当时面临的难题,对港珠澳大桥施工控制有相当大的影响。本文基于地质勘察、施工监测和数值
模拟,对港珠澳大桥大直径钢圆筒的振动打入过程进行了研究,对东、西人工岛钢圆筒的振动打入速率、安装精度和动力响应进行了分析。土体振动摩阻力对钢圆筒的可打性具有重要影响,但目前的振动摩阻力设计方法因无法考虑尺寸效应而欠缺准确性。因此,本研究针对大直径开口薄壁钢圆筒的非土塞工况,提出了一种土体振动摩阻力的计算方法,通过归一化的有效面积比A¯r,eff来考虑尺寸效应。采用本文提出的振动摩阻力模型进行的可打性分析结果与实测数据更接近,为今后的工程实践提供了参考。
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