理论与试验研究

上覆土对既有盾构隧道影响的试验研究

  • 黄大维 ,
  • 陈后宏 ,
  • 郑明新 ,
  • 胡光静 ,
  • 詹涛
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  • 1.华东交通大学 山区土木工程安全与韧性全国重点实验室,南昌 330013;
    2.华东交通大学,综合立体交通信息感知与融合江西省重点实验室,南昌 330013;
    3.中铁广州工程局集团有限公司,广州 511457;
    4.南昌轨道交通集团有限公司地铁项目管理分公司,南昌 330038
黄大维(1984—),男,湖南郴州人,博士,教授,主要从事地下铁道与岩土工程相关研究。E-mail:gddthdw@126.com
郑明新(1966—),男,江西南昌人,博士,教授、博士生导师,主要从事边坡稳定与道路工程病害整治相关研究。E-mail:zhmx@ecjtu.jx.cn

收稿日期: 2024-11-22

  网络出版日期: 2025-09-03

基金资助

国家自然科学基金(52378398);江西省主要学科学术和技术带头人领军人才项目(20232BCJ22009);江西省自然科学基金(20242BAB26077)

Experimental Study on the Influence of Overlying Soil on Existing Shield Tunnels

  • Huang Dawei ,
  • Chen Houhong ,
  • Zheng Mingxin ,
  • Hu Guangjing ,
  • Zhan Tao
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  • 1. State Key Laboratory of Safety and Resilience of Civil Engineering in Mountain Area, East China Jiaotong University, Nanchang 330013, P.R. China;
    2. Jiangxi Provincial Key Laboratory of Comprehensive Stereoscopic Traffic Information Perception and Fusion, East China Jiaotong University, Nanchang 330013, P.R. China;
    3. China Railway Guangzhou Engineering Bureau Group Co., Ltd., Guangzhou 511457, P.R. China;
    4. Metro Project Management Branch of Nanchang Rail Transit Group Co., Ltd., Nanchang 330038, P.R. China

Received date: 2024-11-22

  Online published: 2025-09-03

摘要

针对盾构隧道在上覆土作用下易发生横椭圆变形超限问题,设计了1∶10缩尺模型盾构隧道,开展了上覆土作用对既有盾构隧道变形影响的试验研究。结果表明:(1)随着上覆土层厚度的增加,隧道顶部土压力增长变化最大,底部次之,两侧最小;(2)在隧道上覆土层厚度大于0.4 m后,发生了显著的竖向土压力集中,由此导致竖向土压力增长幅度较未发生竖向土压力集中时更大;(3)隧道上覆土作用下,由于竖向土压力大于水平土压力,导致隧道发生横椭圆变形;(4)隧道所处地层的侧土压力系数随着上覆土层厚度的不断增加而逐渐增大,且在厚度达到一定程度后,侧土压力系数增长速率大幅度降低。成果可为既有盾构隧道的管控与周围附加土压力的分布提供参考。

本文引用格式

黄大维 , 陈后宏 , 郑明新 , 胡光静 , 詹涛 . 上覆土对既有盾构隧道影响的试验研究[J]. 地下空间与工程学报, 2025 , 21(4) : 1250 -1257 . DOI: 10.20174/j.JUSE.2025.04.16

Abstract

In response to the problem of shield tunneling prone to lateral elliptical deformation exceeding the limit under the action of overlying soil, a 1∶10 scale model shield tunnel is designed, the influence of overburden soil on the deformation of the existing shield tunnel is studied by experiment. The results show that: (1) As the thickness of the overlying soil layer increases, the maximum increase and change in soil pressure at the top of the tunnel, followed by the bottom, and the minimum on both sides. (2) Significant vertical soil pressure concentration occurs after the thickness of the overlying soil layer on the tunnel is greater than 0.4 m. As a result, the increase in vertical soil pressure is greater than vertical soil pressure concentration does not occur. (3) Under the action of soil cover on the tunnel, due to the vertical soil pressure being greater than the horizontal soil pressure, the tunnel undergoes transverse elliptical deformation. (4) At the location of the tunnel, the lateral soil pressure coefficient of the stratum gradually increases with the increasing thickness of the overlying soil layer. And after reaching a certain degree of thickness, the growth rate of lateral soil pressure coefficient significantly decreases. The results provide reference for the control of existing shield tunnels and the distribution of additional soil pressure around them.

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