Effects of relative humidity and temperature on subcritical crack growth in igneous rock

被引:88
作者
Nara, Yoshitaka [1 ,2 ]
Hiroyoshi, Naoki [2 ]
Yoneda, Tetsuro [2 ]
Kaneko, Katsuhiko [2 ]
机构
[1] UCL, Dept Earth Sci, Rock & Ice Phys Lab, London WC1E 6BT, England
[2] Hokkaido Univ, Grad Sch Engn, Kita Ku, Sapporo, Hokkaido 0608628, Japan
基金
日本学术振兴会;
关键词
Subcritical crack growth; Double-torsion technique; Granite; Andesite; Temperature; Relative humidity; TORSION LOADING CONFIGURATION; LONG-TERM STRENGTH; SODA-LIME GLASS; STRESS-CORROSION; POLYCRYSTALLINE ALUMINA; UNIAXIAL COMPRESSION; IMPROVED METHODOLOGY; FRACTURE-TOUGHNESS; BRITTLE MATERIALS; OSHIMA GRANITE;
D O I
10.1016/j.ijrmms.2010.04.009
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
Effects of relative humidity and temperature on subcritical crack growth in igneous rock have been investigated experimentally on samples of Kumamoto andesite and Oshima granite. Stress intensity factors and crack velocities were measured using the double-torsion technique, and all experiments were conducted in moist air. Our results show that in experiments conducted under the same relative humidity, crack velocity increased with increasing temperature, in agreement with previous studies. Our results also show that, in experiments conducted at the same temperature , crack velocity increased dramatically with increasing relative humidity. A three- to four fold increase in relative humidity resulted in an increase in crack velocity of between one and four orders of magnitude. Such an increase is larger than that predicted by classical stress corrosion theory. It is suggested that capillary condensation of water vapour close to crack tips of small aperture influences the rate of crack growth. It is concluded that relative humidity needs to be controlled to avoid time-dependent weakening and extend the life time of structures in a rock mass. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码:640 / 646
页数:7
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