城市轨道交通隧道矿山法暗挖侧穿高架桥的施工影响
乔洪磊1梁祖铨1耿建仪2杨新安1
Construction Impact of the Side\|crossing Viaduct on Urban Rail Tunnel Excavated by Mining Method
QIAO HongleiLIANG ZuquanGENG JianyiYANG Xinan
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作者信息:1.同济大学道路与交通工程教育部重点实验室，201804，上海
2.上海国际机场股份有限公司，201207，上海
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Affiliation:Key Laboratory of Road and Transportation Engineering, Tongji University, Ministry of Education, 201804, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2023.11.023
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中图分类号/CLCN:U455.4
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栏目/Col:研究报告
摘要:
目的：合肥市轨道交通线路暗挖工程存在多次侧穿高架桥的情况，需研究隧道结构近接侧穿高架桥的施工影响，选用合理的施工方案，以有效提高施工的安全性。方法：以合肥市轨道交通2号线天柱路站附属1号出入口CRD（交叉中隔墙）法暗挖隧道工程为研究对象，采用MIDAS GTS/NX数值模拟软件建立了不同施工工况下的数值模型，对长江西路高架桥的桥梁承台及立柱变形、桥梁桩基变形、高架桥附近地面沉降进行了分析，并将数值模拟结果与现场的实测结果进行对比。结果及结论：监测点地面沉降实测变化曲线与模拟曲线基本一致，验证了模拟计算的准确性。对于侧穿既有高架桥梁的浅埋暗挖隧道施工而言，先开挖远离高架侧施工部的工况优于先开挖靠近高架侧施工部的工况，且CRD法中6 m台阶长度工况优于3 m台阶长度工况。隧道上方地面沉降在CRD工法前3部开挖及拆撑时产生的变化较大，而后趋于稳定；承台边缘地面沉降因桥梁桩体对地层的摩阻力限制有所减小。浅埋暗挖隧道侧穿施工对桥梁承台和桩基水平变形的影响大于其竖向变形的影响，对靠近浅埋暗挖隧道侧承台和桩基的影响大于远浅埋暗挖隧道侧承台和桩基的影响。
Abstracts:
Objective: There are multiple instances of side\|crossing viaducts in the underground excavation project of Hefei Rail Transit lines. It is necessary to study the construction impact of the tunnel structure in close proximity to the side\|crossing viaduct and select a reasonable construction scheme to effectively improve construction safety. Method: The CRD (cross road deck) excavation project at the affiliated entrance/exit No.1 of Tianzhu Road Station on Hefei Rail Transit Line 2 is studied. Using MIDAS GTS/NX numerical simulation software, environmental impact analysis numerical models under different construction conditions are established. The deformation of bridge caps, columns, and the bridge pile foundation, and the surface settlement of the ground near the viaduct are analyzed. The numerical simulation results are compared and analyzed with the monitored results on\|site. Result &Conclusion: The measured ground settlement curves at the monitoring points are consistent with the simulated curves, verifying the accuracy of the calculation. For the construction of shallow buried tunnel side\|crossing the existing viaducts, the working condition of excavating the far elevated side construction section first is better than that of excavating the near elevated side construction section first, and the working condition of 6m bench length in CRD method is better than that of 3 m bench length. The ground settlement above the tunnel changes greatly during the first three parts of CRD excavation and support removal, and then tends to be stable; The surface settlement at the edge of the pile cap will be reduced due to the friction resistance of the bridge pile to the stratum. The impact of shallow buried tunnel side\|crossing construction on the horizontal deformation of bridge bearing platform and pile foundation is greater than on the vertical deformation, and the impact on the bearing platform and pile foundation near the shallow buried tunnel side is greater than on those near the far shallow buried tunnel side.
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