列车循环动荷载下地铁四孔交叠隧道长期沉降及控制分析
彭红霞1王怀东2袁云辉2李琪睿3,4
Long-term Settlement and Control Analysis of Fourhole Overlapping Metro Tunnel under Train Cyclic Load
PENG HongxiaWANG HuaidongYUAN YunhuiLI Qirui
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作者信息:1.南京地铁建设有限责任公司， 210017， 南京；
2.中铁第六勘察设计院集团有限公司， 300308， 天津；
3.同济大学道路与交通工程教育部重点实验室， 201804, 上海；
4.上海轨道交通基础设施耐久性与系统安全重点实验室， 201804， 上海
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Affiliation:Nanjing Metro Construction Co., Ltd., 210017, Nanjing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2021.10.007
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中图分类号/CLCN:U456.3
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栏目/Col:研究报告
摘要:
以南京地铁5号线下穿3号线为例，采用ABAQUS软件建立四孔交叠隧道的三维有限元模型，计算列车动荷载作用下的土体动应力，并结合经验模型预测交叠隧道的长期沉降量。结果显示，交叠隧道最大沉降量达16.3 mm，曲率半径为13 589 m，相对变曲为1/1 100，均超出规范要求，须采取沉降控制措施。现场拟在5号线隧道施工期采用壁后注浆加固措施。结果显示，采用地层加固措施后运营期交叠隧道的最大沉降量降低至10.4 mm，曲率半径增大至18 750 m，相对变曲减小至1/2 575，均满足规范要求。地层加固措施可有效控制隧道交叠区沉降的发展，保障隧道结构长期服役性能。
Abstracts:
Based on Nanjing metro Line 5 that crosses under Line 3, a 3D finite element model of fourhole overlapping tunnel is established by using ABAQUS software, to calculate the dynamic stress of soil under the action of train dynamic load, and predict the long-term settlement of the overlapping tunnels with empirical formula. The results show that the maximum settlement of overlapping tunnels is 16.3 mm, the radius of curvature is 13 589 m, relative curvature is 1/1 100, all exceed the specifications, and settlement control measures must be taken. It is proposed to adopt back wall grouting reinforcement measures during the construction of Line 5 tunnels. The result shows that the maximum settlement is reduced to 10.4 mm, the radius of curvature increased to 18 750 m, and the relative deflection reduced to 1/2 575 by taking grouting reinforcement measurement, all meet the specifications. Therefore, the strata reinforcement measures can control the settlement in overlapping areas effectively and ensure the long-term service of tunnel structure.
引文 / Ref:
彭红霞，王怀东，袁云辉，等.列车循环动荷载下地铁四孔交叠隧道长期沉降及控制分析[J].城市轨道交通研究，2021，24(10):31.
PENG Hongxia，WANG Huaidong，YUAN Yunhui，et al.Long-term settlement and control analysis of four-hole overlapping metro tunnel under train cyclic load[J].Urban Mass Transit，2021，24(10)：31.
PENG Hongxia，WANG Huaidong，YUAN Yunhui，et al.Long-term settlement and control analysis of four-hole overlapping metro tunnel under train cyclic load[J].Urban Mass Transit，2021，24(10)：31.
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