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http://dx.doi.org/10.9711/KTAJ.2010.12.6.417

Longitudinal arching effect of an under-passing tunnel on the existing tunnel undergoing a load of upper structures  

Lee, Yong-Jun (아주대학교 환경건설교통공학부)
Lee, Sang-Duk (아주대학교 환경건설교통공학부)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.12, no.6, 2010 , pp. 417-427 More about this Journal
Abstract
In the ease that a new cross tunnel is constructed under the existing tunnel, development of a longitudinal arching would be influenced by the existing tunnel. But it is not enough to investigate. Especially, the influence of the structure loads on the ground surface on the new tunnel, which the under-passes existing tunnel has been rarely studied. This study, therefore, aimed to clarify the effect of the existing tunnel and the structure on the ground surface on the development of a longitudinal ground arching during the excavation of a cross tunnel under the existing tunnel. Two-dimensional model tests were carried out in the test box, whose dimension was 30 cm (wide) ${\times}$ 113 cm (deep) ${\times}$ 87 cm (high). The existing tunnel was made of S21 steel tube in 16 cm diameter and 1 mm thickness. The ground surface load was 4.9 kPa and was loaded on the model structure in the size with 30 cm width ${\times}$ 16 cm height. New tunnel was excavated in 250 mm height by a bench cut method. As results, the longitudinal arching would be developed but it was severely influenced by not only the existing upper tunnel but also the ground surface load. The influence of the ground surface load on the development of longitudinal ground arching around a new tunnel showed the highest value when the tunnel face located direct under the surface load.
Keywords
Cross tunnel; load of upper structures; model test; longitudinal arching effect;
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