上下重叠隧道盾构法施工引起的地面沉降分析
李振东
Analysis of Land Subsidence Induced by Vertical Overlapping Tunnel Shield Construction
LI Zhendong
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作者信息:1.北京市轨道交通建设管理有限公司，100068，北京
2.城市轨道交通全自动运行系统与安全监控北京市重点实验室，100068，北京
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Affiliation:1.Beijing MTR Construction Administration Co., Ltd., 100068, Beijing, China
2.Beijing Key Laboratory of Fully Automatic Operation and Safety Monitoring for Urban Rail Transit, 100068, Beijing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.07.017
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中图分类号/CLCN:U455.43
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栏目/Col:研究报告
摘要:
［目的］重叠隧道特殊的施工方式可能会导致地面沉降槽的形成及地层损失率的增加，对周边环境和建筑物造成影响。因此，有必要对重叠隧道施工中的地面沉降规律进行研究。［方法］以北京地铁昌平线清河小营桥站—学知园站区间的完全重叠段隧道为例，结合数值分析与现场监测数据，系统地研究了盾构重叠隧道施工过程中的地面沉降和地层损失情况，分析了上线隧道和下线隧道的施工顺序对地面沉降槽形态、最大沉降值及地层损失率的影响。［结果及结论］盾构重叠隧道施工中存在明显的叠加效应。上线隧道的施工会对地层造成一定的损失，并导致地面最大沉降值的增加。重叠施工情况下，上线隧道开挖造成的地层损失小于不涉及重叠施工情况下的上层隧道单独施工造成的地层损失。重叠隧道施工中的地层损失率不受隧道埋深变化的影响，且单线开挖与重叠开挖的地层损失率相差不大。在本工程类似地层中，地层损失率可大致按0.25%进行估算。
Abstracts:
［Objective］ Due to the special construction method of overlapping tunnels, the formation of land subsidence troughs and the increase in stratum loss rate may affect the surrounding environment and buildings. Therefore, it is necessary to study the influence law of land subsidence in overlapping tunnel construction. ［Method］ Taking the completely overlapping tunnel section of Qinghe Xiaoyingqiao Sta.–Xuezhiyuan Sta. Interval on Beijing Subway Changping Line as example, combining numerical analysis and on-site monitoring data, a systematic study of land subsidence and stratum loss during shield overlapping tunnel construction is conducted. The impact of the construction sequence of the upper and lower line tunnels on the morphology of land subsidence troughs, the maximum subsidence values, and stratum loss rates is analyzed. ［Result & Conclusion］ There is a significant superposition effect in shield overlapping tunnel construction. The construction of upper line tunnel causes some amount of stratum loss and leads to an increase in the maximum land subsidence value. Under overlapping construction conditions, the stratum loss caused by the excavation of upper line tunnel is less than that caused by the separate construction of upper line tunnel without involving the overlapping construction situation. The stratum loss rate during overlapping tunnel construction is not affected by changes in tunnel buried depth, and there is little difference in stratum loss rate between single-line excavation and overlapping excavation. In similar geological conditions to this engineering, the stratum loss rate can be roughly estimated at 0.25%.
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