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A Numerical Analysis: Effects of Hydraulic Characteristics of a Hazardous Zone on the Face Stability in Subsea Tunnelling  

Hong, Eun-Soo (한국지질자원연구원 지반안전연구부)
Park, Eui-Seob (한국지질자원연구원 지반안전연구부)
Shin, Hee-Soon (한국지질자원연구원 지반안전연구부)
Kim, Hyung-Mok (한국지질자원연구원 지반안전연구부)
Ryu, Dong-Woo (한국지질자원연구원 지반안전연구부)
Publication Information
Tunnel and Underground Space / v.18, no.5, 2008 , pp. 366-374 More about this Journal
Abstract
Tunnelling under water table induces many geotechnical problems because of groundwater. In subsea tunneling, reduction of face stability can induce flooding in the vicinity of a fracture zone characterized by high permeability and high water pressure. In this study, the effects of high water pressure on the stability of a tunnel face in a limited zone with high permeability(hazardous zone) are analyzed. On the basis of the 'advance core' concept, the seepage force acting on a hypothetical cylinder ahead of a tunnel face is modeled. This study focuses on the hydraulic behavior of the ground ahead of the tunnel face by three-dimensional steady-state seepage analyses. The impact of the hazardous zone on the seepage force and stability of the tunnel face are simulated and analyzed. In light of the analysis results, it is estimated that the distance from the tunnel face to the exterior boundary limit, which the seepage force significantly affects the stability of the tunnel face, of a hypothetical cylinder is approximately 5 times the tunnel radii. Despite the restrictive assumptions of this study, the results are highly indicative regarding the risks of hazardous zones.
Keywords
Face stability; Hazardous zone; Hydraulic gradient; Subsea tunnel; Water pressure;
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Times Cited By KSCI : 1  (Citation Analysis)
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