Seismic response and damage mechanism of tunnel lining in sensitive environment of soft rock stratum

IF 5.8 4区工程技术 Q1 MECHANICS

Applied Rheology Pub Date : 2023-01-01 DOI:10.1515/arh-2022-0141

Guangchen Sun, Wen-chen Fan, Helin Fu, Shan He, Hao Shen, S. Yin, Peng Yin, Xueyi Wang

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Abstract

Abstract In order to investigate the dynamic response characteristics and damage mechanism of the tunnel lining at the tunnel portal in the bridge–tunnel overlapping section in soft rock strata, a physical model with the scale ratio of 1:50 was made based on the similarity theory for shaking table tests. The acceleration and strain results of the tunnel lining under EL Centro seismic waves with different acceleration peak values were studied. Test results show that most of the acceleration values have significant amplification effects compared to input seismic waves, which increased significantly with greater peak values and elevations. Tensile deformations appear along the longitudinal and the circumferential directions of the tunnel lining. The tunnel spandrel and tunnel vault are the maximum deformation parts, respectively, at the standard section and the enlarged section of the tunnel lining. Therefore, it is suggested that the longitudinal anti-tensile design of the tunnel lining at the tunnel portal in such sensitive environments should be strengthened. And the anti-seismic design standard and durability requirement of the standard section of the tunnel lining adjacent to the enlarged section should be improved, so as to meet the requirements for stress deformation and overall stability when subjected to severe earthquakes.

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软岩地层敏感环境下隧道衬砌的地震反应及破坏机理

摘要为了研究软岩层桥隧叠交断面隧道隧洞隧洞隧洞衬砌的动力响应特性及损伤机理，基于相似理论建立了比例尺为1:50的物理模型进行振动台试验。研究了不同加速度峰值EL Centro地震波作用下隧道衬砌的加速度和应变结果。试验结果表明，与输入地震波相比，大多数加速度值具有显著的放大效应，随着峰值和高程的增大，加速度值显著增大。隧道衬砌纵向和周向均出现拉伸变形。隧道拱和隧道拱分别是隧道衬砌标准断面和放大断面的最大变形部位。因此，建议加强这种敏感环境下隧洞洞口衬砌的纵向抗拉设计。并应完善扩建段相邻隧道衬砌标准断面的抗震设计标准和耐久性要求，以满足在剧烈地震作用下的应力变形和整体稳定要求。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Rheology 物理-力学

CiteScore

3.00

自引率

5.60%

发文量

审稿时长

>12 weeks

期刊介绍： Applied Rheology is a peer-reviewed, open access, electronic journal devoted to the publication in the field of applied rheology. The journal provides the readers with free, instant, and permanent access to all content worldwide; and the authors with extensive promotion of published articles, long-time preservation, language-correction services, no space constraints and immediate publication.