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Ground settlement caused by pipe-roof pre-construction method: Effect of the sequence of jacking pipe groups

管幕预筑法施工引起的地表沉降:顶管群施工顺序的影响

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Abstract

Based on the Taiyuan Railway Station underpass tunnel project, the influence of construction process of closed pipe-roof pre-construction structures on the ground settlement was investigated. Numerical simulations were used firstly to analyze the ground settlement characteristics caused by three types of different jacking pipe sequences, i. e., from top to bottom, simultaneous construction bottom and top, and bottom to top with nine cases. Numerical simulation results show that the top-down jacking pipe sequence caused the least amount of ground settlement at 12 mm. The largest amount of ground settlement of 25 mm was caused by using the bottom-up jacking pipe sequence. The numerical simulation results were validated by large scale model tests. The results of the model tests agree with the numerical simulation results, with the top-down jacking pipe sequence causing the least ground settlement and the bottom-up jacking pipe sequence causing the most ground settlement. Based on numerical simulation and model tests results, the reasonable jacking pipe sequence was successfully applied in the north tunnel of Taiyuan Railway Station to meet the settlement requirements. The results of the research show that micro soil arches are formed between adjacent jacked pipes in the jacking pipe construction. The micro soil arches between adjacent pipes above the tunnel combine into a large pipe soil arch structure, which can reduce the ground settlement caused by the jacking pipe under the tunnel and on both sides. Therefore, the sequence of jacking pipe considering a pipe soil arch structure can reduce the ground settlement caused by the jacking pipe.

摘要

以太原火车站下穿隧道为例,研究了封闭管幕预筑隧道在顶管阶段的地表沉降特征。首先采用 数值模拟分析了3 类顶管顺序,从上向下、上下同时施工和从下向上的9 种工况,顶管施工顺序引 起的地表沉降特征。数值模拟结果表明采用从上向下的顶管施工顺序引起的地表沉降量最小,为　 12 mm;采用从下向上的顶管施工顺序引起的地表沉降量最大,为25 mm。通过大尺寸模型试验对数 值模拟结果进行了验证,模型试验结果与数值模拟结果一致,从上向下的顶管施工引起的地表沉降最 小,从下向上顶管施工顺序引起的地表沉降最大。基于数值模拟与模型试验结果,确定了太原火车站 北隧道的顶管群施工顺序,现场监测结果表明选择的施工方案满足沉降要求。研究结果表明,在顶管 施工阶段相邻顶管之间会形成微土拱,隧道上方相邻管道之间的微土拱将组合成大的管土拱结构,可 以减少隧道下方和两侧顶管阶段引起的地表沉降。因此,考虑隧道上方管土拱结构的顶管施工顺序可 以减小下方顶管施工引起的地表沉降。

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Authors and Affiliations

  1. School of Transportation, Southeast University, Nanjing, 211189, China

    Song-song Yang  (杨松松), Ding-wen Zhang  (章定文), Miao Wang  (汪淼), Jing-min Xu  (徐敬民), Chen Shen  (沈晨) & Chao-zhe Zhang  (张超哲)

  2. China Road and Bridge Corporation, Beijing, 100010, China

    Miao Wang  (汪淼)

Authors
  1. Song-song Yang  (杨松松)
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  2. Ding-wen Zhang  (章定文)
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  3. Miao Wang  (汪淼)
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  4. Jing-min Xu  (徐敬民)
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  5. Chen Shen  (沈晨)
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  6. Chao-zhe Zhang  (张超哲)
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Contributions

The overarching research goals were developed by YANG Song-song, ZHANG Ding-wen, and ZHANG Chao-zhe. YANG Song-song provided measured data for jacking pipe construction and analyzed the measured data. SHEN Chen and ZHANG Chao-zhe established the models and calculated the predicted displacement. XU Jing-min and WANG Miao analyzed the calculated results. The initial draft of the manuscript was written by YANG Song-song, ZHANG Ding-wen, and WANG Miao.

Corresponding author

Correspondence to Ding-wen Zhang  (章定文).

Ethics declarations

YANG Song-song, ZHANG Ding-wen, WANG Miao, XU Jing-min; SHEN Chen; ZHANG Chao-zhe declare that they have no conflict of interest.

Additional information

Foundation item: Project(52078129) supported by the National Natural Science Foundation of China; Projects(KYCX22_0268, SJCX21_0031) supported by the Postgraduate Research & Practice Innovation Program of Jiangsu Province, China

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Yang, Ss., Zhang, Dw., Wang, M. et al. Ground settlement caused by pipe-roof pre-construction method: Effect of the sequence of jacking pipe groups. J. Cent. South Univ. 31, 576–588 (2024). https://doi.org/10.1007/s11771-023-5445-y

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  • DOI: https://doi.org/10.1007/s11771-023-5445-y

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