[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.9711/KTAJ.2011.13.3.215

An experimental study on the load transfer machanism of shallow 2-arch tunnel excavation sequence with vertical discontinuity planes in sandy ground

Oh, Bum-Jin (아주대학교 건설교통공학과)
Lee, Sang-Duk (아주대학교 환경건설교통공학부 건설시스템공학과)

Publication Information

Journal of Korean Tunnelling and Underground Space Association / v.13, no.3, 2011 , pp. 215-231 More about this Journal

Abstract

In this study, the behavior of a shallow 2-arch tunnel during the excavation in the sandy ground containing vertical discontinuity plane was experimentally studied. Load transfer mechanism in the pillar caused by a 2-arch tunnel excavation was observed. The position of the vertical discontinuity plane was varied. Model tests were carried out in the normal construction sequence of 2-arch tunnel. Test results-showed that the load transfer caused by the 2-arch tunnel excavation was concentrated in the discontinuity plane, and was cut by the discontinuity plane, so no load transfer took place above the discontinuity plane. It was also shown that the effect of adjacent tunnel excavation on the pillar load and the ground deformation was greater when excavating the upper half-face of the main tunnel, more than when excavating the lower half-face.

Keywords

2-arch tunnel; vertical discontinuity plane; load transfer; loosening area;

Citations & Related Records

Reference

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