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隧道建设(中英文) ›› 2023, Vol. 43 ›› Issue (S2): 395-405.DOI: 10.3973/j.issn.2096-4498.2023.S2.044

• 规划与设计 • 上一篇    下一篇

富水砂层既有运营车站地下障碍物的冻结法清障方案力学分析及工程应用

朱〓敏, 徐〓琛, 汪子豪   

  1. (长江勘测规划设计研究有限责任公司, 湖北 武汉〓430010

  • 出版日期:2023-12-30 发布日期:2024-03-28
  • 作者简介:朱敏(1983—),男,江西南昌人,2008年毕业于西南交通大学,桥梁与隧道工程专业,硕士,高级工程师,现从事隧道工程、岩土工程等领域的设计和科研工作。 Email: 11439688@qq.com。

Mechanical Analysis and Engineering Application of Obstacles Clearing Using Freezing Method Under Existing Operational Stations in WaterRich Sandy Layer

ZHU Min, XU Chen, WANG Zihao   

  1. (Changjiang Institute of Survey, Planning, Design and Research, Wuhan 430010, Hubei, China)

  • Online:2023-12-30 Published:2024-03-28

摘要:

为解决在富水砂层条件下新建盾构隧道如何下穿既有运营车站地下障碍物的问题,依托武汉地铁12号线区间下穿某既有运营车站,提出清障井明挖提供作业面、清障井内纵向冻结人工开挖破除地下障碍物、素混凝土回填后盾构掘进的方案。首先,参考行业内标准及相似案例,给出既有运营车站相应的允许变形控制指标;其次,采用有限元数值分析方法对冻结开挖、清障井开挖、盾构掘进各个工序进行力学分析,提出各个工序的设计和施工关键技术要点;最后,通过现场实测变形数据分析可知,既有车站底板变形在有限元计算值范围内。该方案在保障既有运营车站变形可控的同时,能克服富水砂层条件下地下障碍物人工破除时存在的涌水、坍塌问题,提升了新建隧道下穿地下结构障碍物的安全性。

关键词: 清障井, 盾构隧道, 地下障碍物, 冻结, 力学分析

Abstract: To clean the obstacles encountered during a shield tunnel crossing underneath operational station in waterrich sandy stratum, a case study is conducted on Wuhan metro line 12 crossing underneath an operational station, and a construction scheme, opencut obstacle cleaning shaft, obstacle cleaning by longitudinal freezing in shaft, and shield tunneling after backfilling with plain concrete, is proposed. First, the allowable deformation control indicators for the existing operating station are given by referring to industry standards and similar cases. Second, mechanical analysis is conducted on freezing excavation, obstacle cleaning shaft excavation, and shield tunneling using finite element numerical method, and key technical points of design and construction of each process are proposed. Finally, according to analytical results of the measured deformation data on site, the deformation of the existing station floor is within the range of the calculated value by finite element. The proposed scheme ensures the controllable deformation of the existing operational station, addresses water inrush and collapse problems during manual breaking of the underground obstacles in waterrich sandy layer, and improves the safety of the new tunnel passing through the underground structural obstacles.

Key words:

obstacle clearing shaft, shield tunnel, underground obstacles, freezing, mechanical analysis