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Effects of Rock Weathering on the Degradation of Engineering Properties  

Lee Chang-Sup ((주)동해이엔지)
Cho Taechin ((주)동해이엔지)
Publication Information
Tunnel and Underground Space / v.15, no.6, 2005 , pp. 411-424 More about this Journal
Abstract
Weathering is defined as a process by which surface rock, once formed in the deep ground, is broken down and altered to keep the equilibrium with the ambient environment. In this study granitic rock samples of different weathering grades were collected in the field and the microscopic observation, X-ray diffraction analysis, electron microscopic observation, chemical analysis, and rock property tests were carried out. Formation of secondary minerals, especially clay minerals, by weathering was identified and the mechanism for the change of engineering properties such as rock strength degradation was analyzed. Tunnel model test, Failure behaviour, Shallow tunnel, Unsupproted tunnel length.
Keywords
Weathering; Granitic rock; Weathering mechanism; Secondary mineral; Rock strength degradation;
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