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Study of Structurally Controlled Slope Instability: Pibanryeong, Chungbuk, S. Korea  

Cheong, Sang-Won (Department of Science Education, Chungbuk National University)
Choi, Byoung-Ryol (Department of Science Education, Chungbuk National University)
Publication Information
The Journal of Engineering Geology / v.18, no.4, 2008 , pp. 459-470 More about this Journal
Abstract
Types of slope failure related to cut slope stability are interpreted through case analyses, and also factors affecting structurally controlled instability investigated, which are developed by geologic structures along a national road No. 25 across the Cheongwon and Boeun-Guns, Chungbuk. Engineering properties such as orientation, persistence, roughness and uniaxial compressive strength of joints are analyzed by square-inventory method in three areas with well-preserved outcrops. The study area is located in Ogcheon folded bet, and are composed of quartz-schist and quartzite in the Midongsan Formation and phyllite in the Ungyori Formation. Flexural beds by folding, schistosity and cleavage besides joints are developed due to slight metamorphism. Various types of joints developed by folding are formed such as strike-parallel, strike-perpendicular, wedge and wrench joint sets by both initially regional and later superposed folding. Factors of slope instability are created by crossing the orientations of joint, cleavage, bedding and slope one another. In the case that the orientation of a slope is coincident with one of beds, factors causing large-scale failure including plane failure are increased greatly. Also in the region that orientations of the slope and bed are crossed each other at high angle, only local and minor failures are shown in the slope.
Keywords
cut slope; geologic structures; types of failure; engineering properties; joints developed by folding;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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