Influence of surrounding environment on subcritical crack growth in marble

被引:44
作者
Nara, Yoshitaka [1 ]
Kashiwaya, Koki [1 ]
Nishida, Yuki [1 ]
Ii, Toshinori [2 ]
机构
[1] Kyoto Univ, Grad Sch Engn, Nishikyo Ku, Kyoto 6158540, Japan
[2] Tottori Univ, Dept Civil Engn, 4-101 Koyama Minami, Tottori 6808552, Japan
关键词
Subcritical crack growth; Marble; Relative humidity; Temperature; Water; Porosity; FRACTURE-TOUGHNESS; STRESS-CORROSION; DISSOLUTION KINETICS; IMPROVED METHODOLOGY; LOAD-RELAXATION; STATIC FATIGUE; BRITTLE CREEP; CALCITE; TEMPERATURE; PROPAGATION;
D O I
10.1016/j.tecto.2017.04.008
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Understanding subcritical crack growth in rock is essential for determining appropriate measures to ensure the long-term integrity of rock masses surrounding structures and for construction from rock material. In this study, subcritical crack growth in marble was investigated experimentally, focusing on the influence of the surrounding environment on the relationship between the crack velocity and stress intensity factor. The crack velocity increased with increasing temperature and/or relative humidity. In all cases, the crack velocity increased with increasing stress intensity factor. However, for Carrara marble (CM) in air, we observed a region in which the crack velocity still increased with temperature, but the increase in the crack velocity with increasing stress intensity factor was not significant. This is similar to Region II of subcritical crack growth observed in glass in air. Region II in glass is controlled by mass transport to the crack tip. In the case of rock, the transport of water to the crack tip is important. In general, Region II is not observed for subcritical crack growth in rock materials, because rocks contain water. Because the porosity of CM is very low, the amount of water contained in the marble is also very small. Therefore, our results imply that we observed Region II in CM. Because the crack velocity increased in both water and air with increasing temperature and humidity, we concluded that dry conditions at low temperature are desirable for the long-term integrity of a carbonate rock mass. Additionally, mass transport to the crack tip is an important process for subcritical crack growth in rock with low porosity. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:116 / 128
页数:13
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