岩盤力学

[3401-10-08] 水分量が岩石の時間依存性に与える影響

^○包 添書¹、片岡 みなみ¹、羽柴 公博¹、福井 勝則¹ (1. 東京大学)

司会: 児玉淳一（北海道大学）

キーワード：岩石、一軸圧縮試験、時間依存性、水分量、応力―歪曲線

In this study, the effect of water content on rock strength and time dependent behavior was investigated with conducting uniaxial compression tests under the following six conditions: oven-dried, vacuum-dried, air-dried, air-dried for one day, immersed in water and water-saturated conditions. The samples used in this study were four Japanese rocks: Sanjome andesite, Tage tuff, Kimachi sandstone and Akiyoshi marble. The tests were performed with alternating loading rate to estimate the time dependence of the rocks. From the experimental results, the negative effects of water content on the peak strength and failure stain were observed. As well, the effect of water content on two indexes, which represent the degree of the time dependence, were investigated and discussed with the constitutive equation.