循环剪切对岩石节理形貌与力学行为影响实验研究
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摘要
为研究岩石节理在循环剪切作用下的物理力学特性变化规律,对节理试件进行了不同法向荷载下的循环剪切试验,并对节理表面形貌进行了测量研究。结果表明:随着循环剪切次数的增加,节理表面最高点与最低点之间的垂直距离迅速减小,试件所施加的法向荷载越大则会增加节理表面形貌的劣化程度,节理表面的劣化主要发生在第1次剪切过程。节理峰值抗剪强度与残余强度均随剪切次数增加而减小,第2次剪切以后节理剪切曲线峰值点消失,峰值抗剪强度几乎与残余抗剪强度相等。同时,随着形貌特征的劣化,节理剪胀随着剪切次数的增加而减小。
In order to investigate the characteristics of rock joint under direct shear stress,a series of laboratory tests including cyclic direct shear tests were conducted.Morphology parameters of the rock joint surface were precisely calculated.The analysis results showed that with the increase of shear cycles,the vertical distance between the peak and the valley rapidly decreased.It also showed that the larger the normal load applied to the specimen,the larger were the increases of the degree of deterioration of the surface morphology of the joints.The degradation of joint surface mainly occurred during the first shear process.The shear strength and residual strength of the joints decreased with the increase of shear cycles.After the second shear process,the peak shear strength was almost equal to the residual shear strength and the peak points of shear curve disappeared from the shear curves.With the degradation of joint surface morphology,the shear dilation decreased with the increase of shear cycles.
In order to investigate the characteristics of rock joint under direct shear stress,a series of laboratory tests including cyclic direct shear tests were conducted.Morphology parameters of the rock joint surface were precisely calculated.The analysis results showed that with the increase of shear cycles,the vertical distance between the peak and the valley rapidly decreased.It also showed that the larger the normal load applied to the specimen,the larger were the increases of the degree of deterioration of the surface morphology of the joints.The degradation of joint surface mainly occurred during the first shear process.The shear strength and residual strength of the joints decreased with the increase of shear cycles.After the second shear process,the peak shear strength was almost equal to the residual shear strength and the peak points of shear curve disappeared from the shear curves.With the degradation of joint surface morphology,the shear dilation decreased with the increase of shear cycles.
引文
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[8]HOSSAINI K A,BABANOURI N,NASAB S K.The influence of asperity deformability on the mechanical behavior of rock joints[J].International Journal of Rock Mechanics&Mining Sciences,2014,70:154-161.
[9]朱小明,李海波,刘博,等.含一阶和二阶起伏体节理剪切强度的试验研究[J].岩石力学与工程学报,2011,30(9):1810-1818.ZHU Xiaoming,LI Haibo,LIU Bo,et al.Experimental study of shear strength of joints with first-order and second-order asperities[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(9):1810-1818.(in Chinese)
[10]朱小明,李海波,刘博,等.含二阶起伏体的模拟岩体节理试样剪切特性试验研究[J].岩土力学,2012,33(2):354-360.ZHU Xiaoming,LI Haibo,LIU Bo,et al.Experimental study of shear characteristics by simulating rock mass joints sample with second-order asperities[J].Rock and Soil Mechanics,2012,33(2):354-360.(in Chinese)
[11]朱小明,李海波,刘博.循环剪切荷载作用下含二阶起伏体模拟岩石节理力学特性研究[J].岩土力学,2014(2):371-379.ZHU Xiaoming,LI Haibo,LIU Bo.Study of mechanical characteristics of simulated rock joints with secondorder asperity under cyclic shear loading[J].Rock and Soil Mechanics,2014(2):371-379.(in Chinese)
[12]MIRZAGHORBANALI A,NEMCIK J,AZIZ N.Effects of cyclic loading on the shear behaviour of infilled rock joints under constant normal stiffness conditions[J].Rock Mechanics and Rock Engineering,2014,47(4):1373-1391.
[13]MIRZAGHORBANALI A,NEMCIK J,AZIZ N.Effects of shear rate on cyclic loading shear behaviour of rock joints under constant normal stiffness conditions[J].Rock Mechanics and Rock Engineering,2014,47(5):1931-1938.
[14]TSE R,CRUDEN D M.Estimating joint roughness coefficients[J].International Journal of Rock Mechanics and Mining Sciences&Geomechanics Abstracts,1979,16(5):303-307.
[15]孙辅庭,佘成学,万利台.Barton标准剖面JRC与独立于离散间距的统计参数关系研究[J].岩石力学与工程学报,2014,33(S2):3539-3544.SUN Futing,SHE Chengxue,WAN Litai.Research on relationship between JRC of Barton’s standard profiles and statistic parameters independent of sampling interval[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(S2):3539-3544.(in Chinese)
[16]GRASSELLI G,EGGER P.Constitutive law for the shear strength of rock joints based on three-dimensional surface parameters[J].International Journal of Rock Mechanics and Mining Science,2003,40(1):25-40.
[2]BARTON N.Review of a new shear-strength criterion for rock joints[J].Engineering Geology,1973,7(4):287-332.
[3]BARTON N,CHOUBEY V.The shear strength of rock joints in theory and practice[J].Rock Mechanics,1977,10(1/2):1-54.
[4]赵坚.岩石节理剪切强度的JRC-JMC新模型[J].岩石力学与工程学报,1998,17(4):349-357.ZHAO Jian.A new JRC-JMC shear strength criterion for rock joint[J].Chinese Journal of Rock Mechanics and Engineering,1998,17(4):349-357.(in Chinese)
[5]PATTON F D.Multiple modes of shear failure in rock[C]∥Proceedings of the 1st Congress of International Society of Rock Mechanics.Lisbon:International Society for Rock Mechanics and Rock Engineering Press,1966:509-513.
[6]BABANOURI N,NASAB S K,BAGHBANAN A,et al.Over-consolidation effect on shear behavior of rock joints[J].International Journal of Rock Mechanics&Mining Sciences,2011,48(8):1283-1291.
[7]PARK J W,SONG J J.Numerical method for the determination of contact areas of a rock joint under normal and shear loads[J].International Journal of Rock Mechanics&Mining Sciences,2013,58:8-22.
[8]HOSSAINI K A,BABANOURI N,NASAB S K.The influence of asperity deformability on the mechanical behavior of rock joints[J].International Journal of Rock Mechanics&Mining Sciences,2014,70:154-161.
[9]朱小明,李海波,刘博,等.含一阶和二阶起伏体节理剪切强度的试验研究[J].岩石力学与工程学报,2011,30(9):1810-1818.ZHU Xiaoming,LI Haibo,LIU Bo,et al.Experimental study of shear strength of joints with first-order and second-order asperities[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(9):1810-1818.(in Chinese)
[10]朱小明,李海波,刘博,等.含二阶起伏体的模拟岩体节理试样剪切特性试验研究[J].岩土力学,2012,33(2):354-360.ZHU Xiaoming,LI Haibo,LIU Bo,et al.Experimental study of shear characteristics by simulating rock mass joints sample with second-order asperities[J].Rock and Soil Mechanics,2012,33(2):354-360.(in Chinese)
[11]朱小明,李海波,刘博.循环剪切荷载作用下含二阶起伏体模拟岩石节理力学特性研究[J].岩土力学,2014(2):371-379.ZHU Xiaoming,LI Haibo,LIU Bo.Study of mechanical characteristics of simulated rock joints with secondorder asperity under cyclic shear loading[J].Rock and Soil Mechanics,2014(2):371-379.(in Chinese)
[12]MIRZAGHORBANALI A,NEMCIK J,AZIZ N.Effects of cyclic loading on the shear behaviour of infilled rock joints under constant normal stiffness conditions[J].Rock Mechanics and Rock Engineering,2014,47(4):1373-1391.
[13]MIRZAGHORBANALI A,NEMCIK J,AZIZ N.Effects of shear rate on cyclic loading shear behaviour of rock joints under constant normal stiffness conditions[J].Rock Mechanics and Rock Engineering,2014,47(5):1931-1938.
[14]TSE R,CRUDEN D M.Estimating joint roughness coefficients[J].International Journal of Rock Mechanics and Mining Sciences&Geomechanics Abstracts,1979,16(5):303-307.
[15]孙辅庭,佘成学,万利台.Barton标准剖面JRC与独立于离散间距的统计参数关系研究[J].岩石力学与工程学报,2014,33(S2):3539-3544.SUN Futing,SHE Chengxue,WAN Litai.Research on relationship between JRC of Barton’s standard profiles and statistic parameters independent of sampling interval[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(S2):3539-3544.(in Chinese)
[16]GRASSELLI G,EGGER P.Constitutive law for the shear strength of rock joints based on three-dimensional surface parameters[J].International Journal of Rock Mechanics and Mining Science,2003,40(1):25-40.