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A Study on the Stability of Deep Tunnels Considering Brittle Failure Characteristic  

Park, Hyun-Ik ((주)힐스펙)
Park, Yeon-Jun (수원대학교 토목공학과)
You, Kwang-Ho (수원대학교 토목공학과)
Noh, Bong-Kun (수원대학교 토목공학과)
Seo, Young-Ho (현대건설(주) 기술개발원)
Park, Chan (한국지질자원연구원)
Publication Information
Tunnel and Underground Space / v.19, no.4, 2009 , pp. 304-317 More about this Journal
Abstract
Most crystalline rocks have much higher compressive strength than tensile strength and show brittle failure. In-situ rock mass, strong enough in general sense, often fails in brittle manner when subjected to high stress exceeding strength in due of geometrically induced stress concentration or of high initial stress. Therefore, it is necessary to verify the brittle failure characteristics of rock and rock mass for proper stability assessment of underground structures excavated in great depths. In this study, damage controlled tests were conducted on biotite-granite and granitic gneiss, which are the two major crystalline rock types in Korea, to obtain the strain dependency characteristics of the cohesion and friction angle. A Cohesion-Weakening Friction-Strengthening (CWFS hereafter) model for each rock type was constructed and a series of compression tests were carried out numerically while varying confining pressures. The same tests were also conducted assuming the rock is Mohr-Coulomb material and results were compared.
Keywords
brittle failure; CWFS model; damage controlled test;
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  • Reference
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