春风路超大直径盾构隧道围岩荷载及管片力学行为分析

孙振川; 吕乾乾; 孙飞祥; 杨振兴

doi:10.3973/j.issn.2096-4498.2024.S2.008

隧道建设 >

2024 , Vol. 44 >Issue S2: 84 - 92

DOI: https://doi.org/10.3973/j.issn.2096-4498.2024.S2.008

研究与探索

春风路超大直径盾构隧道围岩荷载及管片力学行为分析

孙振川 ,
吕乾乾 ,
孙飞祥 ,
杨振兴

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（1. 中铁隧道局集团有限公司，广东广州 511458；2. 隧道掘进机及智能运维全国重点实验室，河南郑州 450001）

孙振川(1972—),男,陕西韩城人,2009年毕业于石家庄铁道学院,土木与建筑专业,硕士,正高级工程师,现从事隧道与地下工程技术与管理工作。 E-mail: szcwyf@163.com。 *通信作者: 吕乾乾, E-mail： 674936740@qq.com。

网络出版日期: 2024-12-20

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Surrounding Rock Load and Segment Mechanical Behavior of Chunfeng Road Super-Large Diameter Shield Tunnel

SUN Zhenchuan ,
LYU Qianqian ,
SUN Feixiang ,
YANG Zhenxing

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(1. China Railway Tunnel Group Co., Ltd., Guangzhou 511458, Guangdong, China; 2. State Key Laboratory of Tunnel Boring Machine and Intelligent Operations, Zhengzhou 450001, Henan, China)

Online published: 2024-12-20

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摘要

为探讨城市超大直径盾构隧道的围岩压力荷载特征，采用理论计算结合现场监测及数值模拟分析，针对春风路超大直径盾构隧道围岩荷载及管片受力特征开展研究。选取春风路隧道典型断面，进行全覆土理论计算值和实测围岩压力数据对比分析，通过现场监测得到管片结构、钢筋及螺栓的力学行为特征，并建立包含实际配筋的三维管片数值模型与实测值进行对比验证，得到以下结论： 1）砂岩地层中土压力计测得的围岩压力，与全覆土理论不考虑水压的计算值较吻合； 2）某断面偏载侧测点实测荷载相比计算值增加50%，围岩荷载的计算应考虑附加荷载的偏载效应进行局部放大； 3）通过监测数据分析发现管片及钢筋的受力安全冗余度较高，均未超过设计强度值的40%； 4）建模计算得到的结构受力数值与实测值较为吻合； 5）在不考虑人为安装差异时，块间螺栓轴力分布较为均匀。

关键词： 超大直径盾构隧道; 围岩荷载; 力学行为; 现场监测

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孙振川 , 吕乾乾 , 孙飞祥 , 杨振兴 . 春风路超大直径盾构隧道围岩荷载及管片力学行为分析[J]. 隧道建设, 2024 , 44(S2) : 84 -92 . DOI: 10.3973/j.issn.2096-4498.2024.S2.008

Abstract

The theoretical calculation, field monitoring, and numerical simulation analysis are employed to examine the load characteristics of the surrounding rock and segments of a super-large diameter shield tunnel on Chunfeng road. Typical sections of the Chunfeng road tunnel are selected to conduct a comparative analysis of the theoretical calculation values of full-soil cover and the measured pressure data of surrounding rock. The mechanical behavior characteristics of the segment structure, steel bars, and bolts are obtained through field monitoring, and a three-dimensional numerical model of the segment including actual reinforcement is established for comparison and verification with the measured values. The following conclusions are obtained: (1) The surrounding rock pressure measured by the earth pressure gauge in the sandstone formation is in good agreement with the calculated value of the full-soil cover theory without considering the water pressure. (2) The measured load on the off-load side of a section increases by 50% relative to the calculated value, and the calculation of surrounding rock load should consider the off-load effect of additional load for local amplification. (3) The monitoring data analysis shows that the mechanical safety redundancy of the segments and rebar is relatively high, which does not exceed 40% of the design strength value. (4) The structural stress values obtained by modeling are in good agreement with the measured values. (5) Without considering the difference of artificial installation, the axial force distribution of bolts between blocks is relatively uniform.

Key words： super-large diameter shield tunnel; surrounding rock load; mechanical behavior; field monitoring

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