材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
論文
岩石の飽和度を考慮したコンプライアンス可変型粘弾性モデルに関する考察
羽柴 公博福井 勝則包 添書
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2022 年 71 巻 2 号 p. 181-188

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Water saturation conditions in underground rock masses vary with place and time. Hence for estimating the deformation, failure, and time dependent behavior of rock around underground openings, it is essential to consider water saturation in rock mechanical models. In this study, on the basis of recent experimental results, the effect of water saturation was implemented in the variable-compliance-type model based on non-linear viscoelastic theory. The previous variable-compliance-type model possessed the three constants of which values change with a change of water saturation and have been unformulated. In contrast, the constants for water saturation and for time dependence were separated in the proposed model with adopting a new function of stress. Uniaxial compression strength tests and creep tests of andesite were simulated with this proposed model. The calculated results of the stress-strain curves and their water- and time-dependence were coincident with the experimental results. It was found from the calculated and experimental results that the effects of water saturation and strain rate on strength are convertible and that the effects of water saturation and creep stress on creep lifetime are also convertible. These results indicate that creep lifetime in arbitrary water saturation conditions is estimated from the strain rate dependence of strength using the model.

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