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http://dx.doi.org/10.9711/KTAJ.2020.22.3.261

A study on the optimal reinforcement area for excavation of a small cross-section shield TBM tunnel in fault fracture zone through parameter analysis  

Kang, Byung-Yun (Soosung Engineering)
Park, Hyung Keun (School of Civil Engineering, Chungbuk National University)
Cha, Jae-Hoon (Geotechnical and Tunnel Dept., Soosung Engineering)
Kim, Young-Jin (Geotechnical and Tunnel Dept., Soosung Engineering)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.22, no.3, 2020 , pp. 261-275 More about this Journal
Abstract
When excavating a small cross-section tunnel in a fault fracture zone using the shield TBM method, there is a high possibility of excessive convergence and collapse. Appropriate ground reinforcement is required to minimize construction cost loss and trouble due to a fault fracture zone. In this study, the optimal reinforcement area was suggested and the surrounding ground behavior was investigated through numerical analysis using MIDAS GTS NX (Ver. 280). For the parameters, the width of the fault fracture zone, the existence of fault gouge, and the groundwater level and depth of cover were applied. As a result, when there is not fault gouge, the convergence and ground settlement are satisfied the standard when applying ground reinforcement by up to 0.5D. And, due to the high permeability coefficient, it is judged that it is necessary to apply 0.5D reinforcement. There is a fault gouge, it was possible to secure stability when applying ground reinforcement between the entire fault fracture zone from the top of the tunnel to 0.5D. And, because the groundwater discharge occurred within the standard value due to the fault gouge, reinforcement was unnecessary.
Keywords
Shield TBM; Small cross-section tunnel; Fault fracture zone; Fault gouge; Reinforced zone;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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