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http://dx.doi.org/10.9711/KTAJ.2019.21.6.735

A study on the optimal reinforced zone of a small sectional shield TBM tunnel in difficult ground  

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.21, no.6, 2019 , pp. 735-747 More about this Journal
Abstract
Due to the lack of ground space by urbanization, the demand of utility tunnels for laying social facilities is increasing. During the construction of a utility tunnel in downtown area using a shield TBM, various problems may occur when difficult ground is encountered such as mixed ground and cobbly ground. Thus, in this study, using MIDAS GTS NX (Ver. 280), a numerical analysis was performed on characteristics of difficult ground, reinforced area, depth of cover and groundwater level to analyze the optimal ground reinforced area according to combination of parameters. As a result, it was difficult to secure stability in unconstrained excavation cases on both the mixed ground and the cobbly ground. However, when ground reinforcement grouting as much as 2.0D is applied, convergence occurred within the allowable limit, except for mixed ground with a depth of cover 30 m. In addition, excessive leakage occurred during excavation of both the mixed ground and the cobbly layers. It was able to secure stability after applying waterproof grouting.
Keywords
Shield TBM; Small sectional tunnel; Difficult ground; Grouting; Reinforced zone;
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Times Cited By KSCI : 4  (Citation Analysis)
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