Stability evaluation of rock pillar between twin tunnels using the YAI.
Journal
Scientific reports
ISSN: 2045-2322
Titre abrégé: Sci Rep
Pays: England
ID NLM: 101563288
Informations de publication
Date de publication:
14 Aug 2023
14 Aug 2023
Historique:
received:
11
04
2023
accepted:
05
08
2023
medline:
15
8
2023
pubmed:
15
8
2023
entrez:
14
8
2023
Statut:
epublish
Résumé
The stability of rock pillar is crucial for ensuring the construction safety of twin tunnels with small clearance, especially when transitioning from the traditional left-right tunnel layouts to the up-down configurations due to complex and variable site constraints. However, there are limited researches on the evaluation and comparative study of the stability of these two types of rock pillars in twin tunnels. This paper introduces the yield approach index (YAI) as a measure to assess the stability of rock pillar in twin tunnels with small clearance, and various influencing factors including side pressure coefficient (SPC), stress release rate (SRR), and the thickness of rock pillar (characterised by the ratio of rock pillar thickness to tunnel diameter, RPT/TD) are considered in the analysis. The study compares and analyzes the stability differences of the rock pillar in different situations. It is observed that the two sides of up-down tunnels pose a higher risk while the rock pillar in the left-right configuration being the most vulnerable. The stability of the rock pillar between the up-down tunnels is significantly higher than that of the left-right tunnels under similar conditions. Moreover, the up-down tunnels exhibit greater sensitivity to SPC, whereas the left-right tunnels are more sensitive to SRR. Additionally, the study reveals that increasing the RPT/TD can effectively improve the stability of the rock pillar within a specific range (1/4 to 2/3). The research method and obtained results of this paper can provide some important references for the stability evaluation and design of twin tunnels with small clearance.
Identifiants
pubmed: 37580482
doi: 10.1038/s41598-023-40167-9
pii: 10.1038/s41598-023-40167-9
pmc: PMC10425359
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
13187Subventions
Organisme : National Natural Science Foundation of China
ID : 52178395
Informations de copyright
© 2023. Springer Nature Limited.
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