Failure Criteria for Subway Tunnels Based on the Load-Unload Response Ratio Theorye

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Failure Criteria for Subway Tunnels Based on the Load-Unload Response Ratio Theorye

Journal Title: GeoStruct Innovations - Year 2024, Vol 2, Issue 2

Abstract

This study employs a combination of geological investigation, numerical simulation, and theoretical analysis to evaluate the applicability of the load-unload response ratio (LURR) theory in urban tunnels. The results indicate that using the sudden increase in the LURR at critical points or the equivalent plastic strain penetration between the tunnel and the ground surface as failure criteria for subway tunnels is feasible. Under critical instability loads, the equivalent plastic strain zones in the surrounding rock penetrate to the surface during the construction phase, leading to severe deformation of the tunnel chamber group and loss of load-bearing capacity in the surrounding rock. During the operation phase, the tunnel lining plays a primary load-bearing role. Under instability loads, a butterfly-shaped failure zone appears in the surrounding rock. These findings can be utilized for the quantitative evaluation of the overall safety margin of urban subway tunnels.

Authors and Affiliations

Yichao Chen, Honglin Cao, Changchao Tian, Jianbin Sun, Wenhua Ji

Keywords

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Failure Criteria for Subway Tunnels Based on the Load-Unload Response Ratio Theorye

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EP ID EP752456
DOI https://doi.org/10.56578/gsi020202
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