資源開発技術・岩盤工学

[1201-10-10] 花崗岩と砂岩における動的一軸圧縮強度の寸法効果に関する研究

チョ サンホ¹、○Oh Se-wook¹、Min Gyeong-jo¹、Park Se-woong¹、藤井 義明²、福田 大祐² (1. 韓国全北国立大学、2. 北海道大学)

司会：濱中 晃弘（九州大学）

キーワード：動的一軸圧縮強度、寸法依存性岩石強度、スプリット ホプキンズ 圧力 バー

In laboratory measurements of rock properties, the specimen size dependent rock strength has always been an issue. Numerous studies have been conducted to investigate the correlation between specimen size and rock strength under various loading rate in last few decades. In this study, the dynamic uniaxial compression tests of Geochang granite and Kimachi sanstone were carried out to investigate the size-effect on rock dynamic strength. Split Hopkinson pressure bar (SHPB) system was used to load the rock specimens dynamically. Kimachi sandstone and Geochang granite specimens with different diameter and length were prepared. As a result, it has been found that the dynamic uniaxial compression strength of the granite and sandstone have been increased with increasing specimen size. That are coincident with the results revealed recently by some researchers who have showed that the uniaxial compressive strengths of sedimentary rocks significantly increase with increasing specimen diameter up to around 54mm diameter and reduce to with size increment.