| 西安地铁双线隧道地表沉降预测模型研究 |
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| 引用本文： | 佘芳涛,韩日美,刘庚,邵生俊.西安地铁双线隧道地表沉降预测模型研究[J].地震学刊,2011(5):560-566. |
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| 作者姓名： | 佘芳涛 韩日美 刘庚 邵生俊 |
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| 作者单位： | [1]西安理工大学岩土工程研究所,西安710048 [2]西安市地下铁道有限公司,西安710016 |
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| 摘 要： | 针对西安地铁留核心土、上下半洞开挖、超前小导管注浆加固与水平钢撑锁脚的钢拱架和挂网喷层支护的饱和黄土隧道,根据现场地面沉降监测数据,分析了隧道右线、左线掌子面间隔30m开挖过程中洞顶地表沉降变形的历时变化规律,以及左、右线单洞沉降槽和双线沉降槽的分布特征。结果表明,洞顶地表沉降变形可以划分为初期沉降变形、右线开挖主变形、左线开挖主变形及沉降变形稳定4个阶段;左、右线单洞沉降槽和双线沉降槽均可用高斯分布曲线拟合。基于沉降槽Peck公式及O’Reilly和New最大沉降与隧道埋深的关系,得到了饱和黄土隧道单洞与双洞地面沉降槽的宽度和最大沉降,以及右、左线隧道先后开挖单洞的沉降槽宽度比和最大沉降比。考虑双线隧道洞间距、左右洞先后开挖地层松动相互影响以及围岩饱和黄土固结变形的影响,提出了一种饱和黄土隧道双洞开挖施工引起地表沉降的预测模型,验证了该预测模型应用的可靠性。
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| 关 键 词： | 西安地铁 饱和黄土隧道 地面沉降槽 预测计算模型 |
Research on Calculation Model of Settlement Trough of Xi＇an Subway with Double Lines |
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| SHE Fang-tao,HAN Ri-mei,LIU Geng,SHAO Sheng-jun.Research on Calculation Model of Settlement Trough of Xi＇an Subway with Double Lines[J].Journal of Seismology,2011(5):560-566. |
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| Authors: | SHE Fang-tao HAN Ri-mei LIU Geng SHAO Sheng-jun |
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| Institution: | 1.Institute of Geotechnical Engineering,Xi＇an University of Technology,Xi＇an 710048,China;2.Xi＇an Metro Limited Company,Xi＇an 710016,China) |
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| Abstract: | The asymmetric settlement of ground surface caused by the excavation of tunnel in the subway is a key problem in engineering.The settlement trough of saturated loess tunnel with double lines, was monitored by the water level.The surface settlement of the top of right and left tunnels with 30 meter distance between two excavation surfaces changing with time and the characteristics of settlement troughs of single tunnel and double tunnels were analyzed with the monitoring results.It is shown that the settlement can be divided into four stages,including the initial settlement stage,the right tunnel excavation inducing settlement stage,the left tunnel excavation inducing settlement stage and the settlement going to stable stage,and the settlement trough can be described by the Gauss＇s distribution curve.Based on the Peck formula of settlement trough and the relationship between settlement trough and burying depth proposed by O＇Reilly and New,the width of settlement trough,the maximum settlement of single tunnel and double tunnels,the ratio of settlement trough and maximum settlement of right and left single tunnel was obtained by analyzing the monitoring data.Considering the consolidation deformation of saturated loess,settlement caused by the strata becoming flexible in the stress releasing process of excavation and wall rock of new tunnel disturbed by the excavation of former single tunnel,a calculation model of settlement trough of saturated loess tunnel with double lines was proposed by the addition of settlement trough of two tunnels. |
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| Keywords: | Xi＇an subway saturated loess tunnel settlement trough of ground surface calculation model |
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