{"title":"Deformation and mechanical characteristics of tunnel-slope systems with existing anti-slide piles under the replacement structure of pile-wall","authors":"","doi":"10.1016/j.tust.2024.105995","DOIUrl":null,"url":null,"abstract":"<div><p>The planning of mountain tunnels aims to avoid intersecting with landslide-prone areas. However, it is often unavoidable for mountain tunnels to traverse sloped terrain, thereby creating a tunnel-slope system. During the construction of tunnels traversing sloped terrain, disasters such as slope sliding and tunnel collapse frequently occur as a result of tunnel excavation. In order to provide theoretical reference for deformation control and disaster prevention of tunnel-slope systems, taking the left portal of Yangguang Tunnel as a case study, deformation and mechanical characteristics of tunnel-slope systems that incorporate existing anti-slide piles within the context of a replacement structure of pile-wall were studied. A replacement structure of pile-wall was proposed to prevent the sliding of reinforced slopes caused by tunnel excavation. The on-site monitoring data showed that the horizontal displacement of the slope caused by pile cutting and tunnel excavation is 17.7 mm, which proved the reliability of the replacement structure proposed. Under the reinforcement of the replacement structure of pile-wall, tunnel excavation only causes compression deformation of first lining, but the pipe-roof will experience overall sliding deformation. The plastic loosening zone and the disturbance zone of surrounding rock on the deep side of the tunnel are 1.23 times and 3.24 times of the diameter of the tunnel respectively, which are much larger than the loosening zone of the shallow buried side and the tunnel non-biased section. It indicated that the surrounding rock of the deep side of the tunnel is the key area affecting the stability of the tunnel-slope systems. The proposed the replacement structure of pile-wall, as well as the deformation and mechanical characteristics of tunnel-slope systems under its reinforcement, could provide insights for deformation control and disaster prevention of tunnel-slope systems.</p></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":null,"pages":null},"PeriodicalIF":6.7000,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Tunnelling and Underground Space Technology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0886779824004139","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
The planning of mountain tunnels aims to avoid intersecting with landslide-prone areas. However, it is often unavoidable for mountain tunnels to traverse sloped terrain, thereby creating a tunnel-slope system. During the construction of tunnels traversing sloped terrain, disasters such as slope sliding and tunnel collapse frequently occur as a result of tunnel excavation. In order to provide theoretical reference for deformation control and disaster prevention of tunnel-slope systems, taking the left portal of Yangguang Tunnel as a case study, deformation and mechanical characteristics of tunnel-slope systems that incorporate existing anti-slide piles within the context of a replacement structure of pile-wall were studied. A replacement structure of pile-wall was proposed to prevent the sliding of reinforced slopes caused by tunnel excavation. The on-site monitoring data showed that the horizontal displacement of the slope caused by pile cutting and tunnel excavation is 17.7 mm, which proved the reliability of the replacement structure proposed. Under the reinforcement of the replacement structure of pile-wall, tunnel excavation only causes compression deformation of first lining, but the pipe-roof will experience overall sliding deformation. The plastic loosening zone and the disturbance zone of surrounding rock on the deep side of the tunnel are 1.23 times and 3.24 times of the diameter of the tunnel respectively, which are much larger than the loosening zone of the shallow buried side and the tunnel non-biased section. It indicated that the surrounding rock of the deep side of the tunnel is the key area affecting the stability of the tunnel-slope systems. The proposed the replacement structure of pile-wall, as well as the deformation and mechanical characteristics of tunnel-slope systems under its reinforcement, could provide insights for deformation control and disaster prevention of tunnel-slope systems.
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.
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