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http://dx.doi.org/10.7843/kgs.2006.22.8.63

A Review of Strength Estimation Method on Ulsan Sedimentary Rocks  

Min, Tuk-Ki (Dept. of Civil & Envn., Univ. of Ulsan.)
Moon, Jong-Kyu (Dongmyung Eng. Consult. Co.)
Publication Information
Journal of the Korean Geotechnical Society / v.22, no.8, 2006 , pp. 63-72 More about this Journal
Abstract
In the ASTM and ISRM, an uniaxial compressive strength(${\sigma}_{c}$) has been estimated to be 23(ASTM) or $20{\sim}25$(ISRM) times of point load strength index using a diametral test regardless of the rock rating or geological conditions. This paper presents a relationship between $I_{s}$ and ${\sigma}_{c}$ of a weak sedimentary rocks on Ulsan of the Kyung-Sang Basin in Korea. In the results of 291 for ${\sigma}_{c}$ test and 2310 for $I_{s}$ test from 77 spots, the predicted errors of ${\sigma}_{c}$ determined by strength ratio of ${\sigma}_{c}/I_{s}$ have been relatively less than those determined by linear regression analysis. And in case of weak sedimentary rocks such as mudstones, shales and sandstones, ${\sigma}_{c}$ should be lower than those suggested by ISRM and ASTM.
Keywords
Linear regression analysis; Mudstone; Point load strength index; Sandstone; Shale; Uniaxial compressive strength;
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