| 拟建明挖隧道对下部既有隧道稳定性影响分析 |
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| 引用本文： | 于茂春,曹林卫,旷文涛.拟建明挖隧道对下部既有隧道稳定性影响分析[J].路基工程,2014,0(2):196-199. |
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| 作者姓名： | 于茂春 曹林卫 旷文涛 |
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| 作者单位： | 中铁二院重庆勘察设计研究院有限责任公司，重庆 400023 |
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| 摘 要： | 如何评价拟建隧道对既有隧道安全的影响，成了项目中的难题。以拟建重庆市两江大桥隧道工程为背景，对比了目前隧道结构设计与评价中经常采用的荷载结构法和地层结构的主要特点。根据两江大桥隧道与既有轨道隧道的空间关系特点，提出二次荷载-结构法，分析了拟建明挖隧道对下部既有隧道的影响。研究结果表明:上部明挖隧道施工前后，既有隧道衬砌受力变化较大，但上部明挖隧道修建后，既有隧道衬砌安全系数仍大于规范值，满足承载能力和正常使用要求。此法可为类似工程设计和研究提供参考。
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| 关 键 词： | 拟建隧道 既有隧道 稳定性 二次荷载-结构法 数值模拟 |
| 收稿时间： | 2019-11-11 |
Analysis on Influence of Proposed Tunnel in Open Excavation on Existing Tunnel below |
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| Abstract: | How to evaluate the effect of proposed tunnel on existing tunnel’s safety is a difficult problem in a project. Taking the tunnel engineering of the proposed Liangjiang Bridge, Chongqing as the background, the comparison was made between load-structure method and stratum structure method, both of which are commonly used in current design and evaluation of tunnel structure. Based on the characteristic spatial relation between the Liangjiang Bridge Tunnel and the existing tunnel, a secondary load-structure method was put forward, with the effect of the proposed tunnel in open excavation on the existing tunnel below studied. The result shows that, after the excavation of the above tunnel, the force in the existing tunnel lining has a large variation; however, the safety factor of the existing tunnel lining is still larger than the specified value after the construction and meets the requirements of the bearing capacity and normal usage. This method may be referred to by similar engineering design and study. |
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