Experimental study on the structural performance of RCP rehabilitation by spraying method under preloading

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology Pub Date : 2024-11-12 DOI:10.1016/j.tust.2024.106218

Chunliang He , Shun Dong , Jieyao Li , Jiajie Liao , Yingjie Wei , Baosong Ma , Sheng Huang

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Abstract

In this study, an investigation was conducted on the rehabilitation of longitudinally cracked reinforced concrete pipes (RCPs) under preloaded conditions using the spraying method, based on TEB tests. The effects of sustaining preload and not sustaining preload on the performance of the rehabilitated pipes were examined, alongside the relationship between external loads and pipe displacement, strain, and cracks. The results revealed that the bearing capacity of the rehabilitated pipe increased by 5.6% in Specimen B, which was unloaded after preload, and by 22.7% in Specimen C, which maintained preload, compared to the pre-rehabilitation pipe. Compared with Specimen B, the ultimate bearing capacity of the repaired pipe in Specimen C increased by 12.8%, although the displacement at failure was significantly reduced. The failure of the repaired pipe-lining structure primarily occurred through longitudinal cracking and interfacial detachment of the lining. The application of spray lining improves the structural performance of damaged pipe, especially for specimens that maintain preloading.

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预加载下喷涂法修复 RCP 结构性能的实验研究

本研究以 TEB 试验为基础，采用喷涂方法对预载条件下纵向开裂的钢筋混凝土管道（RCP）进行了修复。研究了持续预载和不持续预载对修复管道性能的影响，以及外部荷载与管道位移、应变和裂缝之间的关系。结果表明，与修复前的管道相比，预载后卸载的试样 B 的承载能力提高了 5.6%，保持预载的试样 C 的承载能力提高了 22.7%。与试样 B 相比，试样 C 中修复后管道的极限承载能力提高了 12.8%，但破坏时的位移明显减小。修复后的管道衬里结构主要通过纵向开裂和衬里的界面脱离发生破坏。喷涂衬里可改善受损管道的结构性能，尤其是对保持预加载的试样而言。

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

Tunnelling and Underground Space Technology 工程技术-工程：土木

CiteScore

11.90

自引率

18.80%

发文量

454

审稿时长

10.8 months

期刊介绍： Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.