S型空间曲线圆形顶管管道应力分析——以宁波市电力隧道顶管工程为例

许有俊; 韩志强; 张朝; 孟毅欣; 高胜雷

doi:10.3973/j.issn.2096-4498.2022.08.006

隧道建设 >

2022 , Vol. 42 >Issue 8: 1375 - 1385

DOI: https://doi.org/10.3973/j.issn.2096-4498.2022.08.006

研究与探索

S型空间曲线圆形顶管管道应力分析——以宁波市电力隧道顶管工程为例

许有俊 ,
韩志强 ,
张朝 ,
孟毅欣 ,
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（地下工程方向），博士，教授，主要从事隧道、地下空间等方面的研究工作。Email： xyoujun@163.com。 *通信作者：韩志强， Email： 1076218033@qq.com。

网络出版日期: 2022-09-09

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Stress Analysis of SShaped Space Curve Circular Pipe Jacking of a Power Tunnel in Ningbo, China

XU Youjun ,
HAN Zhiqiang ,
ZHANG Chao ,
MENG Yixin ,
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 and Expert Workstation of Mine Safety and Underground Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China;3.Urban Underground Engineering Technology Research Center of Colleges and Universities in 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: 2022-09-09

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摘要

为探索顶管在S型曲线顶进过程中管道结构荷载变化，以宁波电力顶管隧道工程为背景，结合施工参数对管道环向、纵向钢筋应力和管土接触应力的影响进行实测分析，建立三维数值模拟进行对比，同时采用多工况模拟进行拓展分析。分析结果表明： 1）环向钢筋应力分布不均匀且受转弯影响较小，受注浆压力影响较大，管顶和管底外侧受拉、内侧受压，管腰则相反；纵向钢筋应力主要受顶力影响，在S型曲线上管腰应力交替波动，管底内外侧均受拉，其余部位外侧受拉、内侧受压。2）顶管转向产生不均匀的管土间隙，使注浆压力不均匀，纠偏使管道处于泥浆套的右下方，实测管土接触应力大小为管道左侧＞管顶≈管底＞管道右侧，模拟管土接触应力与实测数据有着相似的变化趋势，应力分布不均匀，且管顶与管底受转弯影响较小，管腰受转弯影响较大。3）拓展模拟得出，管道埋深和坡度较大时，管顶和管底管壁应力变化尤为显著；适当增加注浆压力，可缓解管壁应力不对称、不均匀现象；水平纠偏时纠偏程度不宜过大，避免产生管道应力集中的现象；增大顶力不能使应力重分布，且纵向应力增加不大。

关键词： 圆形顶管隧道; S型空间曲线顶管; 管道应力; 施工参数; 现场监测; 数值模拟

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许有俊 , 韩志强 , 张朝 , 孟毅欣 , 高胜雷 .

S型空间曲线圆形顶管管道应力分析——以宁波市电力隧道顶管工程为例

[J]. 隧道建设, 2022 , 42(8) : 1375 -1385 . DOI: 10.3973/j.issn.2096-4498.2022.08.006

Abstract

To investigate the changes of structural load applied to pipe jacking in the process of Sshaped curve jacking, the influence of construction parameters of Ningbo electric power pipe jacking tunnel on the circumferential and longitudinal reinforcement stress and pipesoil contact stress of the pipeline is analyzed. A threedimensional numerical simulation is conducted to verify actual measurement and expand the multicondition simulation. The results reveal the following: (1) The stress of the circumferential reinforcement is distributed unevenly and is greatly affected by grouting pressure but less affected by machine turning. The top and bottom of the pipe are subjected to tension on the exterior and compression on the interior, whereas the pipe waist is subjected to tension on the interior and compression on the exterior. The longitudinal reinforcement stress is mainly affected by the jacking force. On the Sshaped curve, the pipe waist stress fluctuates alternately; the pipe bottom is subjected to tension on both the interior and exterior, whereas the other parts of the pipe are subjected to tension on the exterior and compression on the interior. (2) The uneven pipesoil gap induced by curved jacking results in uneven grouting pressure. Because deviation correction is applied, the pipeline lies at the bottom right of the mud sleeve. The measured pipesoil contact stress on the left is the largest, followed by that on the top and bottom, and that on the right is the smallest; the simulated and measured data show identical trends (i.e., the stress is distributed unevenly, and machine turning has less effect on the top and bottom of the pipe but a great effect on the pipe waist). (3) The extended simulation shows that when the buried depth and slope of the pipe are large, the stress at the top and bottom of the pipe wall shows clear variations. By selecting an appropriate increase in grouting pressure, the symmetry and evenness of the pipe wall stress can be improved. Large corrections should not be applied for horizontal deviation to avoid stress concentration in the pipe. Increasing the jacking force cannot cause stress redistribution, and the longitudinal stress increases slightly.

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