open access

https://hdl.handle.net/2115/68619

Size effect of dynamic uniaxial compressive strength of a granite and sandstone

英語

Split Hopkinson pressure bar

2018-03-27

The Mining and Materials Processing Institute of Japan

資源・素材学会春季大会講演集(2018)

5(1)

1201-10-10

資源・素材学会平成30(2018)年度春季大会、2018年3月27日（火）～29日（木）、東京大学 本郷キャンパス、東京

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.

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