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A Study on the Stress Induced Brittle Failure around Openings with Cross-sectional Shape by Scaled Model Test and DEM Simulation  

Bae, Seong-Ho (㈜지오제니 컨설턴트)
Jeon, Seok-Won (서울대학교 지구환경시스템공학부)
Park, Eui-Seob (한국지질자원연구원)
Publication Information
Tunnel and Underground Space / v.17, no.5, 2007 , pp. 389-410 More about this Journal
Abstract
For moderately jointed to massive rock masses, the failure and deformation behaviors around an excavated opening are absolutely influenced by the initial rock stress and strength of in-situ rock mass. The localized and progressive brittle failure around an opening does not mean whole collapse of an excavated opening. But, for many cases, it may induce temporary stopping of excavation works and reexamination of the current supporting system, which can result in delay of the entire construction works and additional construction cost. In this paper, the characteristics of the brittle failure around an opening with stress level and tunnel shape was studied by the biaxial compressive test using scaled specimen and by the numerical simulation with $PFC^{2D}$. The biaxial test results were well coincided with the stress induced failure patterns around the excavated openings observed and monitored in the in-situ condition. For the circular part of the opening wall, the stress induced cracks initially occurred at the wall surface in the direction of the minimum principal stress and contributed to the localized notch shaped failure region having a certain range of angle. But for the corner and straight part of the opening wall, the cracks initiated at sharp corners were connected and coalesced each other and with existing micro cracks. Further they resulted in a big notch shaped failure region connecting two sharp corners.
Keywords
Initial rock stress; Progressive brittle failure; Scaled tunnel specimen; Notch shaped failure region;
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Times Cited By KSCI : 1  (Citation Analysis)
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