Quantitative assessment on the reinforcing behavior of the CFRP-PCM method on tunnel linings

IF 2.5 3区工程技术 Q2 ENGINEERING, CIVIL

Geomechanics and Engineering Pub Date : 2021-01-01 DOI:10.12989/GAE.2021.25.2.123

Wei Han, Yujing Jiang, Xuepeng Zhang, D. Koga, Yuan Gao

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引用次数: 3

Abstract

In this paper, the carbon fiber reinforced plastic (CFRP) grids embedded in polymer cement mortar (PCM) shotcrete (CFRP-PCM method) was conducted to repair the degraded tunnel linings with a cavity. Subsequently, the reinforcing effect of the CFRP-PCM method under different degrees of lining deterioration was quantitatively evaluated. Finally, the limit state design method of the M-N interaction curve was conducted to determine whether the structure reinforced by the CFRP-PCM method is in a safe state. The main results indicated that when the cavity is at the shoulder, the lining damage rate is more serious. In addition, the remarkably reinforcing effect on the degraded tunnel linings could be achieved by applying a higher grade of CFRP grids, whereas the optimization effect is no longer obvious when the grade of CFRP grids is too high (CR8); Furthermore, it is found that the M-N numerical values of the ten reinforcing designs of the CFRP-PCM method are distributed outside the corresponding M-N theoretical interaction curves, and these designs should be avoided in the corresponding reinforcing engineering.

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CFRP-PCM法对隧道衬砌加固性能的定量评价

本文采用碳纤维增强塑料(CFRP)网格嵌入聚合物水泥砂浆(PCM)喷射混凝土(CFRP-PCM法)修复退化的含空腔隧道衬砌。随后，定量评价了CFRP-PCM方法在不同衬砌劣化程度下的补强效果。最后，采用M-N相互作用曲线的极限状态设计方法，确定经CFRP-PCM方法加固的结构是否处于安全状态。主要结果表明，当空腔位于肩部时，衬里损伤率更严重。此外，采用较高等级的碳纤维布格栅对退化的隧道衬砌具有显著的加固效果，而当碳纤维布格栅等级过高时，优化效果不再明显(CR8);此外，还发现CFRP-PCM方法的10种加固设计的M-N数值分布在相应的M-N理论相互作用曲线之外，在相应的加固工程中应避免这些设计。

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

Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL

CiteScore

5.20

自引率

25.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions