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Analysis of Slope Stability and Property of Discontinuities Using Square-Inventory Method: The Changri area, Boeun-Gun, Chungbuk  

Choi, Byoung-Ryol (충북대학교 사범대학 과학교육학부)
Cheong, Sang-Won (충북대학교 사범대학 과학교육학부)
Publication Information
Tunnel and Underground Space / v.18, no.1, 2008 , pp. 20-32 More about this Journal
Abstract
The study shows a method called a square-inventory method, which is a better and faster method than scanline survey and window method for an analysis of slope stability. The study area is located in the Changri area, Boeun-Gun, Chungbuk, and consists of many formations of the Okcheon Supergroup. Various types of failure are observed from the phyllite including the rocks in the study area. The physical properties of meta-sedimentary rocks are that minerals of the rocks are composed of microcrystalline quartz and sericite, which are arranged parallel to bedding (or schistosity) and crenulation cleavage. Therefore, such properties affect geotechnical ones of the rock. The slope stability are analyzed by selecting 3 areas, each of which are divided into 2 or 3 slopes of $1m{\times}1m$ area that represent each of 3 investigation sites. The possibility of wedge and toppling failure is very high in all 3 areas by using square-inventory method. Although possibility of plane failure is weak in the investigation site 2, the plane failures are frequently found from the slope of site 2. The bedding (or schistosity) plane and cleavage, another types of discontinuity coexist in meta-sedimentary rocks uulike igneous rocks, and therefore are important factors to be considered together with joint structures in th ε analysis of slope stability.
Keywords
Square-inventory method; Slope stability; Meta-sedimentary rock; Bedding (or schistosity); Crenulation cleavage;
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