開発機械/岩盤工学/資源開発技術

[1K62507-18-07] 三城目安山岩のせん断特性に及ぼす水飽和度と載荷速度の影響 (発表者：博士課程)

○包 添書¹、臧 晟宇¹、羽柴 公博¹、福井 勝則¹ (1. 東京大学大学院)

キーワード：三城目安山岩、せん断強度、水飽和度

It is well known that water accelerates the deformation and failure of rock and disturb the stability of rock structures such as tunnels, underground storages, and rock slopes. Previous studies have been conducted on the effect of water on the strength, stiffness, and time-dependent behavior of rock. However, most of the previous researches on deformation and failure of rock examined the results for just two conditions, air-dry and wet, and did not address various water saturation conditions. These two conditions cannot sufficiently express the water influence on rock deformation and failure. In the other side, previous researches show that the loading rate also has an effect on rock deformation and failure. The authors have conducted uniaxial compression and Brazilian tension tests with various rocks under various water saturation conditions and released the results. In this study, the effects of water saturation conditions on deformation and failure of Sanjome andesite were investigated through direct shear tests under various normal stresses with alternating loading rates. From the results, the authors clarified the effects of both water saturation and loading rate on the shear properties of the andesite such as strength, deformation and failure processes.