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http://dx.doi.org/10.7843/kgs.2009.25.5.65

The Characteristics of Stress Distribution on Two-arch Tunnel's Pillar due to Surface Loads in the Discontinuous Rock Mass  

Kim, Hong-Moon (Dept. of Geotechnical & Tunnel Engrg., Pyung Hwa Engrg. Consultants Ltd.)
Lee, Sang-Duk (Dept. of Civil and Transportation Engrg., Ajou Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.25, no.5, 2009 , pp. 65-73 More about this Journal
Abstract
Large scale model tests and numerical analyses are performed to investigate the stress distribution of pillar due to surface loading nearby two-arch tunnel which is constructed in the regularly jointed rocks. It is observed that the influence of discontinuities on the stress distribution in the discontinuous rock mass and the underground stresses induced by surface loading are greater than those of linear elastic theory. Especially, lines of equal stresses are developed to the direction of inclination according to the inclined grade. In cases of discontinuities imbedded in parallel with or vertical to the ground, the pressure bulbs are formed symmetrically, however, the inclined ones result in stress distribution in parallel with and vertical to the planes of discontinuities. Results indicated that stress distribution is seriously affected by the angle of discontinuity. When stresses propagating to the pillar need to be estimated, relative location of surface loading, grade of discontinuous plane, and location of two-arch tunnel should be carefully considered.
Keywords
Discontinuous rock mass; Pillar; Stress distribution; Two-arch tunnel;
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