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地表超载对软、硬地层中既有盾构隧道影响的试验研究

黄大维, 周顺华, 冯青松, 李雪, 封坤, 黄强

黄大维, 周顺华, 冯青松, 李雪, 封坤, 黄强. 地表超载对软、硬地层中既有盾构隧道影响的试验研究[J]. 岩土工程学报, 2019, 41(5): 942-949. DOI: 10.11779/CJGE201905018
引用本文: 黄大维, 周顺华, 冯青松, 李雪, 封坤, 黄强. 地表超载对软、硬地层中既有盾构隧道影响的试验研究[J]. 岩土工程学报, 2019, 41(5): 942-949. DOI: 10.11779/CJGE201905018
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HUANG Da-wei, ZHOU Shun-hua, FENG Qing-song, LI Xue, FENG Kun, HUANG Qiang. Experimental study on influences of surface surcharge on existing shield tunnels buried in soft and hard soils[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(5): 942-949. DOI: 10.11779/CJGE201905018
Citation: HUANG Da-wei, ZHOU Shun-hua, FENG Qing-song, LI Xue, FENG Kun, HUANG Qiang. Experimental study on influences of surface surcharge on existing shield tunnels buried in soft and hard soils[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(5): 942-949. DOI: 10.11779/CJGE201905018
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地表超载对软、硬地层中既有盾构隧道影响的试验研究  English Version

  • 1. 华东交通大学铁路环境振动与噪声教育部工程研究中心,江西 南昌 330013;
    2. 同济大学上海市轨道交通结构耐久与系统安全重点实验室,上海 201804;
    3. 西南石油大学地球科学与技术学院,四川 成都 610500;
    4. 西南交通大学交通隧道工程教育部重点实验室,四川 成都 610031;
    5. 宁波大学岩土工程研究所,浙江 宁波 315211

基金项目: 国家自然科学基金项目（51608200,51478353,51368020）
详细信息
    作者简介:

    黄大维(1984— ),男,湖南郴州人,博士,讲师,主要从事地下铁道与岩土工程相关研究。E-mail：1110604@tongji.edu.cn。

    通讯作者:

    冯青松，E-mail：fqshdjtdx@aliyun.com

  • 中图分类号: TU43

Experimental study on influences of surface surcharge on existing shield tunnels buried in soft and hard soils

  • 1. Engineering Research Center of Railway Environmental Vibration and Noise, Ministry of Education, East China Jiaotong University, Nanchang 330013, China;
    2. Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety, Tongji University, Shanghai 201804, China;
    3. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    4. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China;
    5. Institute of Geotechnical Engineering, Ningbo University, Ningbo 315211, China

摘要

    摘要
  • 摘要: 为了探明地表超载对软、硬地层中既有盾构隧道的影响,通过隧道与地层相互作用的模型试验,对地表超载作用下隧道变形、土压力及土体沉降进行了量测。试验结果分析表明,相同的地表超载作用下,软土地层中的隧道横椭圆变形要大于硬土地层中的隧道横椭圆变形。当隧道穿越土层的土体压缩模量较小时,地表超载作用下隧道上覆土层表现为被动土拱土压力;当隧道穿越土层的土体压缩模量较大时则为主动土拱土压力。隧道竖向收敛变形与其穿越土层竖向压缩量之间的关系分析表明,隧道横断面变形刚度与穿越土层的土体压缩模量共同决定隧道上覆土层的沉降状态,从而决定了地表超载对既有盾构隧道的影响。研究成果定性地揭示了软土地区既有盾构隧道在地表超载作用下极易发生变形超限的机理。
    Abstract: To explore the influences of surface surcharge on the existing shield tunnels buried in soft and hard soil strata, the scaled model tests on the interaction between shield tunnels and strata are carried out, and the tunnel deformation, earth pressure and soil settlement under surface surcharge are measured. Analysis of model test results shows that under the same surface surcharge, larger deformation is induced for the tunnel buried in soft soils than in hard soils. As the compression modulus of the soil strata is small, the overlaying soils over the tunnel exhibit passive earth arch pressure under surface surcharge. Under the large compression modulus of the soil strata, the overlaying soils over the tunnel show active earth arch pressure. The relation between the vertical convergence deformation of the tunnel and the vertical compression of the soil strata indicates that both the stiffness of cross section of shield tunnel and the compression modulus of soil strata determine the settlement state of the overlaying soils over the tunnel, and thus decide the influences of surface surcharge on the existing shield tunnels. The research results qualitatively reveal the reason of the mechanism why the oversized deformation is easily induced for the existing shield tunnels under surface surcharge.
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  • 收稿日期:  2018-12-10

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