富水卵漂石地层盾构近距离下穿运营地铁隧道施工技术研究
刘文1,2,4姚翔川1,5杨志勇1,3徐波1,3王强5郑龙威6
Construction Technology for Shield Tunnelling Under-passing in Proximity to Operation Metro Tunnels in Water-rich Pebble Stratum
LIU Wen1,2,4YAO Xiangchuan1,5YANG Zhiyong1,3XU Bo1,3WANG Qiang5ZHENG Longwei6
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作者信息:1.中交第二航务工程局有限公司， 430040， 武汉
2.中交武汉智行国际工程咨询有限公司， 430040， 武汉
3.交通运输行业交通基础设施智能制造技术研发中心， 430040， 武汉
4.中交公路长大桥建设国家工程研究中心有限公司， 430040， 武汉
5.中交二航局(成都)建设工程有限公司， 610218， 成都
6.中国地质大学经济管理学院， 430074， 武汉
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Affiliation:1.CCCC Second Harbor Engineering Co., Ltd., 430040, Wuhan, China
2.CCCC Wuhan Zhixing International Engineering Consulting Co., Ltd., 430040, Wuhan, China
3.Research & Development Center of Transport Industry of Intelligent Manufacturing Technologies of Transport Infrastructure, 430040, Wuhan, China
4.CCCC Highway Bridge National Engineering Research Centre Co., Ltd., 430040, Wuhan, China
5.CCCC SHEC (Chengdu) Construction Engineering Co., Ltd., 610218, Chengdu, China
6.School of Economics & Management, China University of Geosciences, 430074, Wuhan, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.04.032
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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］富水卵漂石地层盾构下穿既有地铁线路施工过程中，易导致既有地铁线路上方土体不规则沉降超出控制范围，进而可能引发地下水喷涌和地面塌陷问题。为此，需要对富水卵漂石地层盾构近距离下穿运营地铁隧道的施工技术进行研究。［方法］以新建成都地铁17号线凤溪大道站盾构下穿既有地铁4号线为案例，在阐述工程概况的基础上，选取了4个地面沉降测点和4个深层土体沉降测点，分析了盾构掘进过程中地层的沉降变化规律。采用MIDAS GTS软件建立了三维有限元模型，对采用38 m超长管棚与斜向注浆相结合的加固施工进行模拟，对4号线隧道预加固效果进行了分析。基于此，明确了地面跟踪注浆的时机，进一步分析了地面跟踪注浆的效果。［结果及结论］该加固措施有效提高了4号线结构底部土体的整体性，改善了4号线结构的受力状况，有效控制了4号线的结构沉降。
Abstracts:
［Objective］ In the process of shield construction under-passing the existing metro line in water-rich pebble stratum, irregular settlement of the overlying soil mass beyond control range may occur, potentially leading to issues such as underground water gushing and ground collapse. Therefore, it is necessary to research the construction technology for shield under-passing in proximity to operation metro tunnel in water-rich pebble stratum. ［Method］ Taking the case of shield under-passing existing Chengdu Metro Line 4 at the newly-built Fengxi Avenue Station on Chengdu Metro Line 17, on the basis of introducing project overview, four land subsidence monitoring points and four deep soil mass settlement monitoring points are selected to analyze the stratum settlement variation law during shield excavation process. A three-dimensional finite element model is created using MIDAS GTS, simulating the reinforcement construction with a combination of 38 m super-long pipe shed and oblique angle grouting. The pre-reinforcement effect on Line 4 tunnel is analyzed. Based on this, the timing for ground tracking grouting is determined, and its effectiveness is further analyzed. ［Result & Conclusion］ The reinforcement measures effectively enhance the overall integrity of structure bottom soil mass, improve the structural loading conditions, and successfully control the structural settlement of Line 4.
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