岩石亚临界裂纹扩展机制及工程门槛值研究
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摘要
采用双扭试件常位移松弛法,对4种岩石进行亚临界裂纹扩展试验研究,得出采场矿岩亚临界裂纹扩展速度与应力强度因子之间的关系,分析了不同岩石中裂纹亚临界扩展的规律,确定了岩石亚临界裂纹扩展的停滞速度和工程应用门槛值K0。研究表明:采用常位移松弛法所测岩石的lgKI-lgV关系都有很好的线性规律,即岩石的亚临界裂纹扩展速率与裂纹尖端应力强度因子服从幂函数关系,并且同种岩性的lgKI-lgV关系直线斜率大致相等。4种岩石的K0/KIC值的变化在0.705～0.797之间。试验结果为岩土工程中的可靠性与稳定性研究提供了可靠依据。
The constant-displacement-relax method of double torsion specimens is applied to research the subcritical crack growth of four kinds of rocks.The relationship between subcritical crack velocity and stress intensity factor is obtained.The behavior of subcritical crack growth is analyzed.The engineering threshold values of subcritical crack growth in rocks are obtained.It was shown that lg KI-lg V relations of rocks measured by this method accorded with linear rules.The relations between subcritical crack growth velocity V and stress intensity factor KI conformed to power law and the slope of lg KI-lg V is approximately equal.The range of K0/KIC for these two kinds of rocks was from 0.705～0.797.Reliable references are provided by the testing results for the reliability and stability of geotechnical engineering.
The constant-displacement-relax method of double torsion specimens is applied to research the subcritical crack growth of four kinds of rocks.The relationship between subcritical crack velocity and stress intensity factor is obtained.The behavior of subcritical crack growth is analyzed.The engineering threshold values of subcritical crack growth in rocks are obtained.It was shown that lg KI-lg V relations of rocks measured by this method accorded with linear rules.The relations between subcritical crack growth velocity V and stress intensity factor KI conformed to power law and the slope of lg KI-lg V is approximately equal.The range of K0/KIC for these two kinds of rocks was from 0.705～0.797.Reliable references are provided by the testing results for the reliability and stability of geotechnical engineering.
引文
[1]朱焕春,Andrieux Patrick,钟辉亚.节理岩体数值计算方法及其应用(一):方法与讨论[J].岩石力学与工程学报,2004,23(20):3444-3449.
[2]朱焕春,Andrieux Patrick,钟辉亚.节理岩体数值计算方法及其应用(二):工程应用[J].岩石力学与工程学报,2005,24(1):89-96.
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[6]王桂尧,孙宗颀,徐纪成.岩石II型断裂韧度的实验方法[J].中国有色金属学报,1999,9(1):175-179.
[7]肖洪天,周维垣,杨若琼.三峡永久船闸高边坡流变损伤稳定性分析[J].土木工程学报,2000,23(6):94-98.
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[11]李银平,杨春和.裂纹几何特征对压剪复合断裂的影响分析[J].岩石力学与工程学报,2006,25(3):462-466.
[12]Saadaouia M,Reynauda P,Fantozzia G,et al.Slow Crack Growth Study of Plaster Usingthe Double Torsion Method[J].Ce-ramics International,2000,26(4):435-439.
[13]Krella Andreas,Pippelb Eckhard,Woltersdorf Jorg,et al.Subcritical Crack Growthin Al2O3with Submicron Grain Size[J].Journal of the European Ceramic Society,2003,23(1):81-89.
[14]Ciccotti M,Negri N,Gonzato G,et al.Practical Application of an I mproved Methodology for the Double Torsion Load Re-laxation Method[J].International Journal of Rock Mechanics&Mining Sciences,2001,38(4):569-576.
[15]Atkison B K.Subcritical Crack Growth in Geological Materials[J].Journal of Geophysical Research,1984,89(B6):4077-4114.
[16]Wilkins B J S.Slow Crack Growth and Delayed Failure of Granite[J].International Journal of Rock Mechanics and MiningSciences&Geomechanics Abstracts,1980,17(3):365-369.
[2]朱焕春,Andrieux Patrick,钟辉亚.节理岩体数值计算方法及其应用(二):工程应用[J].岩石力学与工程学报,2005,24(1):89-96.
[3]孙广忠.工程地质与地质工程[M].北京:地震出版社,1993.
[4]Ira O,Bryne T,Ngwenya,et al.Correlation of Micro-seismic and Chemical Properties of Brittle Deformationin LocharbriggsSandstone[J].J Geophys Res,2003,108(B5):2268-2280.
[5]刘亚军,肖洪天,李浩.岩石裂纹亚临界扩展速度的研究[J].武汉水利电力大学学报,2000,33(3):39-42.
[6]王桂尧,孙宗颀,徐纪成.岩石II型断裂韧度的实验方法[J].中国有色金属学报,1999,9(1):175-179.
[7]肖洪天,周维垣,杨若琼.三峡永久船闸高边坡流变损伤稳定性分析[J].土木工程学报,2000,23(6):94-98.
[8]陈枫.岩石压剪断裂的理论与实验研究[D].长沙:中南大学,2002.
[9]张小刚,宋玉普,吴智敏.碾压混凝土穿透型诱导缝等效强度和断裂试验研究[J].水利学报,2004(3):98-102.
[10]鞠杨,刘彩平,谢和平.混凝土断裂与亚临界扩展的细观机制[J].工程力学,2003,20(5):1-9.
[11]李银平,杨春和.裂纹几何特征对压剪复合断裂的影响分析[J].岩石力学与工程学报,2006,25(3):462-466.
[12]Saadaouia M,Reynauda P,Fantozzia G,et al.Slow Crack Growth Study of Plaster Usingthe Double Torsion Method[J].Ce-ramics International,2000,26(4):435-439.
[13]Krella Andreas,Pippelb Eckhard,Woltersdorf Jorg,et al.Subcritical Crack Growthin Al2O3with Submicron Grain Size[J].Journal of the European Ceramic Society,2003,23(1):81-89.
[14]Ciccotti M,Negri N,Gonzato G,et al.Practical Application of an I mproved Methodology for the Double Torsion Load Re-laxation Method[J].International Journal of Rock Mechanics&Mining Sciences,2001,38(4):569-576.
[15]Atkison B K.Subcritical Crack Growth in Geological Materials[J].Journal of Geophysical Research,1984,89(B6):4077-4114.
[16]Wilkins B J S.Slow Crack Growth and Delayed Failure of Granite[J].International Journal of Rock Mechanics and MiningSciences&Geomechanics Abstracts,1980,17(3):365-369.
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