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http://dx.doi.org/10.7843/kgs.2015.31.6.71

A Physical Model Test on the Behavior of Shield-tunnel Lining According to Drainage Conditions in Weathered Granite Soil  

Choi, Gou-Moon (Dept. of Civil Eng., Gangneung-Wonju National Univ.)
Yune, Chan-Young (Dept. of Civil Eng., Gangneung-Wonju National Univ.)
Ma, Sang-Joon (Korea Institute of Construction Technology)
Publication Information
Journal of the Korean Geotechnical Society / v.31, no.6, 2015 , pp. 71-82 More about this Journal
Abstract
Recently, due to the expansion of urban infrastructure for the citizen convenience, the shield tunnel construction has increased considering the civil complaints minimization and construction stability. Most shield tunnels are designed based on the assumption of the undrained condition that underground water does not inflow, but they are operated in the field as drained tunnels with drainage facility to drain underground water. Therefore, the drained condition needs to be considered in the shield tunnel design. It is also necessary to consider the weathered granite soil that is widely distributed throughout the country and consequently is encountered in most of construction sites. In this paper, the model test which can control total stress and pore water pressure and simulate the underground tunnel located in the weathered granite soil below ground water level is conducted. Total stress, pore water pressure and an inflow water into an inner pipe were measured using the testing device. Test results showed that the total stress in a drained condition was lower than in an undrained condition because pore water pressure decreased in a drained condition and an inflow water into an inner pipe was proportional to the loading stress in a drained condition. As a result, if a drained condition is considered in the shield tunnel design, the more economical design can be expected because of the stress reduction of the lining.
Keywords
Shield tunnel design; Total stress; Weathered granite soil; Water pressure; Drained condition;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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