考虑施工因素的盾构下穿对既有隧道沉降影响
薛子钎1夏洪春1,2朱训国1,2严滑钧1
Impact of Shield Under-Passing on Existing Tunnel Settlement Considering Construction Factors
XUE Ziqian1XIA Hongchun1,2ZHU Xunguo1,2YAN Huajun1
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作者信息:1.大连大学建筑工程学院， 116622， 大连
2.辽宁省复杂结构系统灾害预测与防治重点实验室， 116622， 大连
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Affiliation:1.College of Civil Engineering and Architecture, Dalian University, 116622, Dalian, China
2.Liaoning Provincial Key Laboratory of Complex Structure Disaster Prediction and Prevention, Dalian University, 116622, Dalian, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.05.025
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中图分类号/CLCN:U455.43
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栏目/Col:土建工程
摘要:
［目的］新建盾构隧道下穿施工会诱发既有隧道发生沉降变形，因此，有必要研究施工因素在盾构下穿过程中对既有隧道的沉降影响。［方法］以广州地铁22号线下穿3号线工程为例，基于Midas/GTS NX软件建立多组数值模型，分析土仓压力和注浆压力两个施工因素影响下，双线盾构下穿对既有隧道沉降的影响规律；根据不同土仓压力和注浆压力对应的隧道最大沉降值进行曲线拟合；基于考虑隧道埋深影响的既有隧道沉降修正公式，提出了适用于广州地区的、考虑施工因素的双线盾构下穿引起既有隧道沉降的预测公式。［结果及结论］合理范围内，既有隧道的沉降值与土仓压力、注浆压力呈负相关；不同土仓压力和注浆压力的沉降拟合曲线函数，能够预测多种施工因素水平变化下的既有隧道沉降；下穿段土仓压力下限值为0.236 MPa，注浆压力下限值为0.267 MPa；盾构近接穿越施工应加强施工监管和防护，合适的注浆压力和土仓压力能够减小对既有隧道的扰动影响。
Abstracts:
［Objective］The construction of a new shield-tunneling tunnel under-passing the existing tunnel can induce the latter′s settlement and deformation. Therefore, it is necessary to study the impact of construction factors on the settlement of the existing tunnel during the shield under-passing process. ［Method］Taking the project of Guangzhou Metro Line 22 under-passing Line 3 as an example, multiple groups of numerical model are established based on Midas/GTS NX software. The influence rules of double-line shield tunneling under-passing on the existing tunnel settlement under the influence of two construction factors，soil chamber pressure and grouting pressure，are analyzed. Curve fitting is carried out according to the maximum settlement values of the tunnel corresponding to different soil chamber pressures and grouting pressures. Based on the settlement correction formula of the existing tunnel considering the influence of tunnel burial depth, a prediction formula for the settlement of the existing tunnel caused by double-line shield tunneling under-passing is proposed, which is applicable to Guangzhou area and considering construction factors. ［Result & Conclusion］Within a reasonable range, the settlement value of the existing tunnel is negatively correlated with the soil chamber pressure and the grouting pressure. The settlement fitting curve functions of different soil chamber pressures and grouting pressures are capable to predict the settlement of the existing tunnel under the change of multiple construction factor levels. The lower limit of the soil chamber pressure in the under-passing section is 0.236 MPa, and that of the grouting pressure is 0.267 MPa. During the shield tunneling closely under-passing, construction supervision and protection should be strengthened. Appropriate grouting pressure and soil chamber pressure can reduce the disturbance impact on the existing tunnel.
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