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http://dx.doi.org/10.7843/kgs.2018.34.8.5

A Study on Anisotropy of Magnetic Susceptibility of Clastic Sedimentary Rocks in the Gyeongsang Basin  

Choi, Eun-Kyeong (Geo-information Research Group, GI Co., Ltd.)
Kim, Sung-Wook (Geo-information Research Group, GI Co., Ltd.)
Hwang, Woong-Ki (Dept. of Civil Engrg., Korea Maritime and Ocean Univ.)
Kwon, Hyun-Wook (Audit Dept., Busan Metropolitan Corporation)
Kim, Tae-Hyung (Dept. of Civil Engrg., Korea Maritime and Ocean Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.34, no.8, 2018 , pp. 5-14 More about this Journal
Abstract
The grain size of clastic sedimentary rocks classifies the rock types and also causes of anisotropy of the rock. The anisotropy is one of the most important factors that dominates the strength and weathering behavior of rocks. The anisotropy of clastic sedimentary and igneous rocks in the Gyeongsang Basin including Yeongju, Daegu, and Busan were analyzed by magnetic susceptibility expressed by the degree of anisotropy and shape parameter. As the results of the study, the sandstone deposited under lacustrine environment unaffected by the external force shows 1.03 degree of anisotropy. The degrees of anisotropy of the rocks affected by faults and fault rocks show 1.06 and 1.14, respectively. The magnetic susceptibility of rocks is to decrease with the distance from the fault. A fresh mudstone and shale formed by fines show a similar magnitude of the degree of anisotropy to fault rock and correspond to oblate shape parameter due to their sedimentary structure. Due to these reasons, we need attention in design, construction, and maintenance of a structure constructed in mudstone and shale.
Keywords
Clastic sedimentary rocks; Anisotropy magnetic susceptibility; Degree of anisotropy; Shape parameter; Mudstone and shale;
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