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首页 > 过刊浏览>2019年第41卷第1期 >62-69. DOI:10.11835/j.issn.2096-6717.2019.008
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基于时空关系的盾构开挖地表沉降规律
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TU45

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国家自然科学基金（51374163）；武汉市城乡建设委员会科技计划（武城建[2017]12号）


Estimation of ground settlement induced by shield tunnel excavation based on the time-space relationship
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    摘要:

    基于武汉地铁四号线某区间隧道盾构开挖引起的地表沉降数据分析，考虑地表沉降的时空关系，将地表沉降划分为无影响阶段、前期沉降阶段、通过阶段、盾尾空隙沉降阶段、工后沉降阶段，并给出了各个阶段的大致范围及其地表沉降占总沉降的比值。通过对Mindlin解引入时间参数，针对不同阶段地表沉降影响因素进行分析，在前影响距离范围内，盾构机与土体的摩擦力和地层损失对地表沉降的影响占优，在后影响距离范围内，地层损失对地表沉降起到了绝对的控制作用，前期沉降阶段的土层隆起与正面附加推力、摩擦力有关，而正面附加推力、摩擦力和注浆压力导致了工后沉降阶段的土体回弹，由此获得了实时地表沉降预测的理论公式。研究结果表明：理论预测值与实测值能较好的吻合，该公式能够较为准确地实时预测地表沉降。

    Abstract:

    Based on the analysis of ground settlement caused by shield tunneling excavation of a certain section of 4th Line of Wuhan Metro considering tempo-spatial effect of ground settlement, the ground settlement has been divided into five stages as follows:no effect stage, earlier stage, passing stage, tail void stage, passed stage. The distance of each stage between the excavation face and the monitoring section have been suggested. In addition, the ratios of ground settlement in different stages to total settlement have been calculated. The main influence factors of ground settlement in different stages are investigated by introducing time parameter into Mindlin solution. Results show that the friction force and ground loss have more influence on ground settlement before the cutter of the shield machine through monitoring section, and the ground loss has great effect on ground settlement after the cutter through monitoring section. The additional thrust and friction force tend to cause ground-uplifting at the Earlier-stage. Besides, the additional thrust, friction force and grouting pressure may lead to ground resilience during the passed-stage. More importantly, a formula of calculating the real-time ground settlement has been proposed to offer a technical support in engineering construction. The calculated results are in good agreement with the corresponding measured values, indicating that the formula is able to accurately predict the ground settlement in real time.

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王智德,江俐敏,饶宇.基于时空关系的盾构开挖地表沉降规律[J].土木与环境工程学报（中英文）,2019,41(1):62-69. Wang Zhide, Jiang Limin, Rao Yu. Estimation of ground settlement induced by shield tunnel excavation based on the time-space relationship[J]. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING,2019,41(1):62-69.10.11835/j. issn.2096-6717.2019.008

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  • 收稿日期:2018-04-17
  • 在线发布日期: 2019-04-04
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