考虑内部结构的大直径盾构隧道抗震性能  

Seismic performance of large shield tunnel considering internal structure

作　　者：王伟[1] 刘英[1] 庄海洋[1,2] 赵凯 陈国兴[1] WANG Wei;LIU Ying;ZHUANG Haiyang;ZHAO Kai;CHEN Guoxing(Institute of Geotechnical Engineering,Nanjing Tech University,Nanjing 211816,Jiangsu,China;School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,Jiangxi,China)

机构地区：[1]南京工业大学岩土工程研究所,江苏南京211816 [2]华东交通大学土木建筑学院,江西南昌330013

出　　处：《隧道与地下工程灾害防治》2023年第3期78-85,共8页Hazard Control in Tunnelling and Underground Engineering

基　　金：国家自然科学基金面上资助项目(51978333)。

摘　　要：以GIL过江盾构隧道综合管廊为例,通过建立有、无π形支架结构的非线性土-隧道结构静、动力耦合三维有限元分析模型,研究π形支架结构对考虑错缝拼装的盾构隧道整体抗震性能的影响。结果表明:放入π形支架结构后,隧道底部的管片张开量减小显著,减小量达60%;大震下封顶块附近的管片张开量有增大趋势。输入地震动峰值较小时,隧道顶底及π形支架结构-隧道连接处的加速度反应谱变化不大;随着输入地震动峰值的增大,反应谱短周期内波动变大,反应谱值整体下降。整体来看,隧道结构顶部管片混凝土受拉损伤加重,底部受拉损伤相对较轻,受拉损伤主要分布在管片接缝处及其附近区域,在大直径盾构隧道抗震设计时有必要考虑隧道-π形支架结构动力相互作用的影响。Taking the GIL shield tunnel integrated corridor as an example,the non-linear soil-tunnel structure with and without the π-shaped bracket structure was established as a three-dimensional finite element analysis model for static and dynamic coupling,and the effect of theπ-shaped bracket structure on the overall seismic performance of the shield tunnel considering staggered assembly was investigated.The results showed that the tube sheet tension at the bottom of the tunnel was significantly reduced by up to 60% after theπ-shaped bracket structure was placed,and the tube sheet tension near the capping block tended to increase under large earthquakes.The acceleration response spectra at the top and bottom of the tunnel and at the π-frame structure-tunnel connection did not change significantly when the input ground shaking peak was small;as the input ground shaking peak increases,the response spectra fluctuate significantly within short periods and the overall response spectra values decreased.On the whole,the tensile damage to the concrete at the top of the tunnel structure was aggravated,while the tensile damage at the bottom was relatively light,and the tensile damage was mainly distributed at and around the tube joints.It was necessary to consider the effect of the tunnel-π-shaped support structure dynamic interaction in the seismic design of large diameter shield tunnels.

关 键 词：盾构隧道 π形支架结构 抗震性能 数值模拟 地震破坏 

分 类 号：TU4[建筑科学—土工工程]