| 朱荣军,席培胜.基坑开挖对既有隧道影响分析[J].安徽建筑大学学报,2018,26(4):40-44 |
| 基坑开挖对既有隧道影响分析 |
| Analysis of Influence of Foundation Pit Excavation on Existed Tunnel |
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| DOI：10.11921/j.issn.2095-8382.20180408 |
| 中文关键词: 基坑开挖 地铁隧道 数值模拟 |
| 英文关键词: excavation of foundation pit metro tunnel numerical simulation |
| 基金项目:超浅埋城市道路下人行隧道暗发展基金(D0750802) |
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| 中文摘要: |
| 基坑开挖势必导致下部隧道发生变形，威胁地铁隧道的安全。通过 Midas/GTS 有限元软件，对合肥地铁1号线上部基坑开挖过程中隧道的位移进行了数值模拟，分析了不同工况下隧道横向和纵向变形。结果表明：基坑中心下方的隧道拱顶产生最大竖向位移，且在基坑开挖范围内隧道竖向位移变化最大。隧道横向水平位移最大值发生在距离基坑中心8m下的拱腰处，并不是在基坑中心位置。数值计算结果和隧道原位测试结果比较接近，说明数值模拟的边界和参数的选取是符合实际工况的，本文的方法可以为今后类似工程提供参考。 |
| 英文摘要: |
| The pit excavation of foundation will inevitably lead to deformation of the lower tunnel，threatening the safety of the subway tunnel. In this paper，Midas/GTS finite element software is used to simulate the displacement of the tunnel in the excavation process of the upper foundation pit of Hefei Metro Line 1. The transverse and longitudinal deformations of the tunnel under different working conditions are analyzed. The results show that the maximum vertical displacement of the tunnel vault under the center of the pit is the largest，and the vertical displacement of the tunnel has the largest change in the excavation of the foundation pit. The maximum horizontal displacement of the tunnel occurs at the center of the arch at the center of the foundation pit 8m，not in the center of the pit. The results of numerical calculation are close to the results of artificial monitoring in tunnel，indicating that the selection of boundary and parameters of numerical simulation is in line with the actual working conditions. The method of this paper can provide reference for similar projects in the future. |
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