開発機械/岩盤工学/資源開発技術

[1K62507-18-07] Effect of Water Saturation and Loading Rate on the Shear Properties of Sanjome Andesite

○Tianshu Bao¹, Shengyu Zang¹, Kimihiro Hashiba¹, Katsunori Fukui¹ (1. the University of Tokyo)

Keywords:Sanjome Andesite, Shear strength, Water saturation

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.