地下水位下降对运营盾构隧道衬砌力学性能的影响  被引量:1

Influence of Groundwater Level Decline on Mechanical Performance of Subway Shield Tunnel Lining during Operation

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作  者:吴锋 翟天立 WU Feng;ZHAI Tianli(School of Civil Engineering,Dalian Jiaotong University,Dalian 116028,China)

机构地区:[1]大连交通大学土木工程学院,辽宁大连116028

出  处:《大连交通大学学报》2024年第1期67-72,共6页Journal of Dalian Jiaotong University

摘  要:为了分析单双侧降水模式下运营期盾构隧道衬砌结构的应变以及裂缝扩展情况,应用有限元软件Abaqus建立道床-隧道-土层有限元模型,通过扩展有限元功能实现初始裂缝扩展,得到衬砌应变以及裂缝扩展规律。结果表明:单侧水位下降导致衬砌横竖向应变以及裂缝扩展出现非对称性变化,排水侧竖向应变约为未排水侧对称点位置的2.6~7倍;未排水侧竖向裂缝扩展长度是排水侧的0.015倍。与拱腰位置相比,拱顶及拱脚裂缝开展更明显,且拱脚裂缝扩展长度最长,约为其他位置裂缝扩展长度的2倍;裂缝位于拱顶及拱底时损伤破坏发展较快,管片结构出现突发性破坏。相同工况下,双裂缝扩展比单裂缝扩展更加迅速。In order to analyze the strain and crack expansion of the shield tunnel lining structure during the operation period under the single and double side waterfall modes,the finite element software Abawus was applied to establish a bed-tunnel-soil finite element model,and the initial crack expansion was achieved by extending the finite element function to derive the lining strain and crack expansion law.The results show that the lining strain and crack extension are vary asymmetrical due to the drop in water level on one side,with the vertical strain on the drained side being about 2.6-7 times longer than the symmetrical point on the undrained side.The vertical crack extension on the undrained side is 0.015 times longer than that on the drained one.Compared with the waist of the arch,the cracks in the top and foot of the arch are more obvious,and the crack extension in the foot of the arch is the longest,about twice as long as the crack extension in other locations.

关 键 词:盾构式隧道 地下水位变化 裂缝扩展 力学性能 有限元 

分 类 号:U451.4[建筑科学—桥梁与隧道工程]

 

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