| 近距离重叠隧道盾构施工的纵向效应及对策研究 |
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| 引用本文： | 章慧健,仇文革,冯冀蒙,郑余朝,龚伦.近距离重叠隧道盾构施工的纵向效应及对策研究[J].岩土力学,2010,31(11):3569-3573. |
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| 作者姓名： | 章慧健 仇文革 冯冀蒙 郑余朝 龚伦 |
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| 作者单位： | 西南交通大学,土木工程学院,成都,610031 |
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| 基金项目： | 国家自然科学基金资助项目（No. 50878185）。 |
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| 摘 要： | 上下重叠隧道施工时,后挖隧道施工过程对先建隧道是一种"卸载"作用,受此影响,先建隧道的衬砌管片将朝后挖隧道方向变形,但这种影响作用是暂时的。以深圳地铁3号线老街站-晒布路站区间重叠隧道工程为背景,采用三维有限元数值计算和室内离心模型试验相结合的手段,对上部隧道(后挖隧道)施工引起的下方已建隧道纵向变位进行了研究。结果表明,后挖隧道施工引起的先建隧道不均匀沉降主要出现在约掌子面前方3.5D(D为隧道直径)到后方3D的范围内。基于此,探讨了应对这种暂时纵向效应的对策措施,主要包括临时压重和临时内撑。在先建隧道位于掌子面后方(0～1)D、(1～2)D、(2～3)D范围内分别设置20t/3m、20t/6m、20t/9m的临时压重,且在掌子面前方4D和后方4D范围内为先建隧道设置临时内撑,可以较好地减小由于后挖隧道施工引起的先建隧道附加不均匀变形。
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| 关 键 词： | 重叠隧道 盾构施工 纵向效应 临时支撑 对策 |
| 收稿时间： | 2009-04-29 |
Study of longitudinal mechanical behavior and countermeasure for neighborhood overlapped shield tunneling |
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| ZHANG Hui-jian,QIU Wen-ge,FENG Ji-meng,ZHENG Yu-chao,GONG Lun.Study of longitudinal mechanical behavior and countermeasure for neighborhood overlapped shield tunneling[J].Rock and Soil Mechanics,2010,31(11):3569-3573. |
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| Authors: | ZHANG Hui-jian QIU Wen-ge FENG Ji-meng ZHENG Yu-chao GONG Lun |
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| Institution: | School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China |
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| Abstract: | For overlapped tunnels construction, excavating the second tunnel is an unloading process for first tunnel. So the lining of first tunnel will deform toward second tunnel; but this is temporary. Based on Laojie ~ Shaibulu shield tunnel of Shenzhen metro line 3, 3D FEM and centrifuge model test are used to study the longitudinal displacements of first tunnel induced by second tunnel construction directly above. The results indicate that the differential displacements of first tunnel induced by second tunnel construction mainly occurs in the range between 3.5D (3.5 times the diameter of the new tunnel) in front of and 3D behind the excavation face. According to this, the countermeasures have been taken into account, mainly including temporary ballast and temporary support. In the range of (0-1)D, (1-2)D, (2-3)D adding temporary ballast of 20 t/3 m, 20 t/6 m, 20 t/9 m respectively to first tunnel; and setting temporary support in first tunnel in the range between 4D in front of and 4D behind the excavation face will well reduce the differential displacements of lower tunnel induced by upper tunnel excavation. |
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| Keywords: | overlap tunnels shield tunneling longitudinal effect temporary support countermeasure |
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