Size effect of dynamic uniaxial compressive strength of a granite and sandstone
チョ, サンホ ,
Oh, Se-wook ,
Min, Gywong-jo ,
Park, Se-Woong 藤井, 義明 ,
, p.1201-10-10 , 2018-03-27 , 資源・素材学会 ＝ The Mining and Materials Processing Institute of Japan
In laboratory measurements of rock properties, the specimen size dependent rock strength has always beenan issue. Numerous studies have been conducted to investigate the correlation between specimen size androck strength under various loading rate in last few decades. In this study, the dynamic uniaxial compressiontests of Geochang granite and Kimachi sanstone were carried out to investigate the size-effect on rockdynamic strength. Split Hopkinson pressure bar (SHPB) system was used to load the rock specimensdynamically. Kimachi sandstone and Geochang granite specimens with different diameter and length wereprepared. As a result, it has been found that the dynamic uniaxial compression strength of the granite andsandstone have been increased with increasing specimen size. That are coincident with the results revealedrecently by some researchers who have showed that the uniaxial compressive strengths of sedimentary rockssignificantly increase with increasing specimen diameter up to around 54mm diameter and reduce to with size increment.