Evaluation of strengthening localized cracking of tunnel lining with strain hardening cementitious composites

International Conference on Structural and Civil Engineering Research

June 06-07, 2019 | Paris, France

Zhanfeng Qi, Wenhua Chen, Lei Zhang and Zhiyi Huang

Zhejiang University, China

Posters & Accepted Abstracts: JET

Abstract

The lining cracking of mountain tunnel has always been a common engineering disease in traffic engineering, and the structural instability and leakage of tunnel caused by lining cracking seriously threaten the safety of tunnel operation. In this article, the strain hardening cementitious composites (SHCCs) characterized by the excellent deformation resistance and large energy absorption capacity is utilized to strengthen the cracked lining. Initially, the details of reinforcing lining process with SHCCs is introduced through a project. Moreover, the reinforcement effect is evaluated with relative stiffness K function based on three parameters: thickness of reinforcement layer h2, concrete damage factor d1, and strain hysteresis factor d2. The results obtained by employing a simplified tunnel reinforcement model show that in the case where the lining damage state d1 is equal, as the thickness of the reinforcement layer h2 increases, the K value also increases. And when the value of d1 decreases, the growth rate of K increases. The strain hysteresis factor d2 also has an important influence on K value, and the results demonstrates that as d2 value increases, however, the K value show an opposite trend. Combining with the project example and evaluation system, it is suggested that the SHCCs can be exploited to strengthen the damaged tunnel lining, and the present engineering experience can provide some reference for similar tunnel lining required to be rehabilitated.

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