S形空间曲线顶管开挖引起的地表沉降计算——以宁波市潘桥变电站迁建工程为例

许有俊; 孟毅欣; 张朝; 韩志强; 郭飞; 高胜雷

doi:10.3973/j.issn.2096-4498.2023.01.005

隧道建设 >

2023 , Vol. 43 >Issue 1: 48 - 57

DOI: https://doi.org/10.3973/j.issn.2096-4498.2023.01.005

研究与探索

S形空间曲线顶管开挖引起的地表沉降计算——以宁波市潘桥变电站迁建工程为例

许有俊 ,
孟毅欣 ,
张朝 ,
韩志强 ,
郭飞 ,
高胜雷

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（1. 内蒙古科技大学土木工程学院，内蒙古包头 014010； 2. 内蒙古科技大学矿山安全与地下工程院士专家工作站，内蒙古包头 014010； 3. 内蒙古科技大学内蒙古自治区高校城市地下工程技术研究中心，内蒙古包头 014010； 4. 北京市政建设集团有限责任公司，北京 100079）

许有俊（1979—），男，内蒙古巴彦淖尔人，2011年毕业于北京工业大学，土木工程专业，博士，教授，现从事隧道、地下工程等方面的理论与技术研究工作。E-mail: xyoujun@163.com。*通信作者：孟毅欣， E-mail： 714818552@qq.com。

网络出版日期: 2023-02-16

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Calculation of Surface Settlement Caused by SShaped Spatially Curved Pipe Jacking: a Case Study of Panqiao Substation Pipe Jacking Project in Ningbo, China

XU Youjun ,
MENG Yixin ,
ZHANG Chao ,
HAN Zhiqiang ,
GUO Fei ,
GAO Shenglei

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(1.School of Civil Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China;2. Academician Workstation of Mine Safety and Underground Engineering,Inner Mongolia University of Science and Technology, Baotou 014010,Inner Mongolia,China;3.Engineering Research Center of Urban Underground Engineering at Universities of Inner Mongolia Autonomous Region,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia, China;4.Beijing Municipal Construction Group Co.,Ltd.,Beijing 100079,China)

Online published: 2023-02-16

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摘要

为研究S形空间曲线顶管隧道施工引起的地表沉降规律，基于Mindlin弹性力学解和随机介质理论，构建S形空间曲线顶管施工引起的地表沉降计算模型，获得顶管施工各参数和空间曲线段施工地层损失引起的沉降规律，并与宁波市潘桥变电站顶管隧道工程地表沉降实测值进行对比验证。研究结果表明： 1）考虑顶管施工引起的附加荷载、水平与竖向超挖间隙等因素所构建的S形空间曲线顶管施工引起的地表沉降计算方法，理论计算值与实测值吻合较好，能够对地表沉降进行较为准确的预测； 2）空间曲线顶管施工引起的地表沉降槽不以顶管中心轴线对称，在顶管机头无超挖刀参与掘进的情况下，最大沉降值向弯道外侧偏移，且顶管机平面转弯产生的超挖间隙对沉降槽偏移影响最大； 3）在S形空间曲线顶进时，地层损失是造成地表沉降的主要原因，应严格控制注浆参数，理论注浆量应包括环形空隙与超挖间隙注浆量体积之和。

关键词： S形曲线顶管隧道; Mindlin解; 随机介质理论; 地表变形

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许有俊 , 孟毅欣 , 张朝 , 韩志强 , 郭飞 , 高胜雷 .

S形空间曲线顶管开挖引起的地表沉降计算——以宁波市潘桥变电站迁建工程为例

[J]. 隧道建设, 2023 , 43(1) : 48 -57 . DOI: 10.3973/j.issn.2096-4498.2023.01.005

Abstract

To investigate the behavior of surface settlement caused by Sshaped spatially curved pipe jacking for tunnel constructions, a calculation method is proposed to obtain the surface settlement caused by Sshaped spatially curved pipe jacking, based on Mindlin′s elastic solution and the random medium theory. The surface settlements are obtained in the construction of the spatially curved section considering various parameters of pipe jacking and formation loss. The calculated results are compared with the measured surface settlements of the pipe jacking tunnel project of Panqiao substation, Ningbo, China. The results show that: (1) By considering the additional load caused by pipe jacking and horizontal and vertical overbreak clearances, the results from the proposed method agree well with the measured results, indicating that the proposed method can accurately predict the actual surface settlement. (2) The surface settlement groove caused by spatially curved pipe jacking is not symmetrical with respect to the central axis of pipe jacking. When there is no overbreak cutter on the cutterhead, the maximum settlement shifts to the outside of the curve, and the overbreak gap generated by plane turning of the pipe jacking machine can dramatically affect the deviation of the surface settlement groove. (3) During the pipe jacking process, the stratum loss causes most of the surface settlement. Therefore, the grouting parameters should be strictly controlled, and the theoretical grouting amount should be the sum of the grout volumes within the annular and over the excavation gaps.

Key words： S-shaped curved pipe jacking tunnel; Mindlin′s solution; random medium theory; surface deformation

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