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Field measurement and analysis on mechanical effects of the arch wall secondary lining construction for the shallow,soft rock and underwater tunnel
Pages: 1-6
Year: Issue:  7
Journal: Geotechnical Investigation & Surveying

Keyword:  水下浅埋隧道 软岩 二次衬砌 力学效应 现场实测;
Abstract: 以一座用矿山法施工的水下浅埋软岩公路隧道为工程背景,基于现场实测数据,分析了施作拱墙二衬对初期支护受力性状的影响以及拱墙二衬本身的受力特性。研究结果表明:与浇注拱墙二衬混凝土的前一天相比,浇注完拱墙二衬混凝土后第20d,初期支护的局部锚杆轴力和局部型钢拱架应力明显减小,说明施作拱墙二衬能分担初期支护承受的部分围岩荷载;而初期支护将承担的部分围岩荷载转移给拱墙二衬后,使拱墙二衬混凝土的应力增加。研究结论可为类似水下隧道的衬砌设计与施工提供参考。
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