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Behaviour of Leaking Tunnels under Unconfined Flow Condition  

Shin Jong-Ho (Dept. of Civil Engrg., Konkuk Univ.,)
Publication Information
Journal of the Korean Geotechnical Society / v.21, no.7, 2005 , pp. 43-54 More about this Journal
Abstract
Tunnelling in a water bearing soil may cause draw-down of ground water table. Modelling of this problem requires considering the change of phreatic surface including the stress constitutive relationship for an unsaturated soil. However, it is normally assumed that ground water is confined. Numerical formulation of coupled behavior considering phreatic surface is described and implemented into computer program. Influence of unconfined flow on tunnel and ground is thoroughly investigated and compared with that of confined flow condition. It is identified that ground and lining behaviour below phreatic surface is almost the same as that under confined flow conditions, however, there is considerable difference in ground behaviour above phreatic surface. It is generally concluded that the assumption of confined flow is acceptable in terms of lining design.
Keywords
Coupled analysis; Leaking tunnel; Phreatic surface; Unconfined flow;
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