{"title":"Safety assessment of unenclosed support in high geostress soft rock tunnels with bench method","authors":"Xuanhao Chen , Dingli Zhang , Wenbo Chen , Siyuan Ni","doi":"10.1016/j.asej.2025.103303","DOIUrl":null,"url":null,"abstract":"<div><div>Ensuring the safe construction of tunnels in high geostress soft rock conditions is crucial and challenging. During the bench excavation, the unenclosed support with low load-bearing capacity may lead to failures. Traditional assessment methods often overlook this risk. This study presents a novel approach to assess the safety of unenclosed support during bench excavation, based on a comprehensive mechanical model. Load strength ratio and safety factor are defined to evaluate the local and overall structural safety. Through parameter analysis, the effects of support stiffness and closure time on the structural failure mechanism are clarified. Within the allowable deformation range, appropriately adjusting the support stiffness and closure time can effectively enhance structural safety. The proposed method is validated through its application in the Yuntunbao Tunnel project, providing valuable insights for the design and safety assessment of other tunnel projects.</div></div>","PeriodicalId":48648,"journal":{"name":"Ain Shams Engineering Journal","volume":"16 3","pages":"Article 103303"},"PeriodicalIF":6.0000,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Ain Shams Engineering Journal","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2090447925000449","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Ensuring the safe construction of tunnels in high geostress soft rock conditions is crucial and challenging. During the bench excavation, the unenclosed support with low load-bearing capacity may lead to failures. Traditional assessment methods often overlook this risk. This study presents a novel approach to assess the safety of unenclosed support during bench excavation, based on a comprehensive mechanical model. Load strength ratio and safety factor are defined to evaluate the local and overall structural safety. Through parameter analysis, the effects of support stiffness and closure time on the structural failure mechanism are clarified. Within the allowable deformation range, appropriately adjusting the support stiffness and closure time can effectively enhance structural safety. The proposed method is validated through its application in the Yuntunbao Tunnel project, providing valuable insights for the design and safety assessment of other tunnel projects.
期刊介绍：
in Shams Engineering Journal is an international journal devoted to publication of peer reviewed original high-quality research papers and review papers in both traditional topics and those of emerging science and technology. Areas of both theoretical and fundamental interest as well as those concerning industrial applications, emerging instrumental techniques and those which have some practical application to an aspect of human endeavor, such as the preservation of the environment, health, waste disposal are welcome. The overall focus is on original and rigorous scientific research results which have generic significance.
Ain Shams Engineering Journal focuses upon aspects of mechanical engineering, electrical engineering, civil engineering, chemical engineering, petroleum engineering, environmental engineering, architectural and urban planning engineering. Papers in which knowledge from other disciplines is integrated with engineering are especially welcome like nanotechnology, material sciences, and computational methods as well as applied basic sciences: engineering mathematics, physics and chemistry.
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