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http://dx.doi.org/10.14481/jkges.2014.15.6.49

Upheaveal Behaviour of Tunnel Bottom in the Weatherd Fracture Zone under Tunnel Excavation  

Chang, Yongchai (Department of Civil Engineering, Mokpo National Maritime University)
Kim, Nagyoung (Korea Expressway Corporation)
Jin, Kyudong (Department of Civil Engineering, Mokpo National Maritime University)
Son, Yongmin (Department of Civil Engineering, Mokpo National Maritime University)
Publication Information
Journal of the Korean GEO-environmental Society / v.15, no.6, 2014 , pp. 49-56 More about this Journal
Abstract
The stability of tunnel construction depends entirely on the characteristics of the soil strength. If the soil strength is weak, collapse of tunnel occurs frequently under construction. In general, it copes with collapse by conducting half section excavation or reinforcement in advance under these conditions. Nevertheless, it can be collapsed under upper section excavation in the weathered fracture zone and it can be recovered through the application of reinforcement. As it has a bad influence on the upper section in case of upheaveal of tunnel bottom, it can be adversely affected on the overall stability of the tunnel. Thus, an in-depth review of reinforcement is needed in poor bottom ground. As the practices that has a bad affect on the stability of the tunnel due to upheaveal of tunnel bottom is increasing, research is needed for applicable standards for reinforcement. In this paper, it were investigated at actual field cases of upheaveal of bottom ground and characteristics of behavior and reinforcement measures were analyzed.
Keywords
Upheaveal behaviour; Excessive displacement; Reinforcement;
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