循环剪切荷载作用下充填物对结构面剪切特性影响试验研究
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摘要
利用相似材料复制劈裂结构面,进行常法向应力下循环剪切试验,研究无充填、充填黄泥3mm、充填石膏3mm和充填岩屑3 mm条件下结构面循环剪切强度、变形和形貌演化特性。结果表明:(1)循环剪切中占主导地位的破坏模式会发生改变,无充填时由剪断破坏向磨损破坏转化,充填黄泥时主要为滑移破坏,充填石膏时由剪断破坏向滑移破坏再向磨损破坏转化,充填岩屑时由剪断破坏向磨损破坏转化。(2)随着循环剪切次数增加,无充填和充填黄泥时峰值剪应力以减速率减小,充填石膏和岩屑时峰值剪应力先减小再以减速率增大,充填物会弱化结构面循环剪切强度,其中以黄泥的弱化影响最大。(3)不同充填材料条件下,结构面循环剪切中平均剪胀角均以减速率减小,有充填时循环剪切中剪缩现象更明显,其中充填黄泥时剪缩幅度最小,充填石膏时剪缩幅度最大。(4)有充填物条件下,循环剪切后结构面磨损程度比无充填条件下要小,其中以充填黄泥时磨损程度最小,充填石膏时磨损程度相对最大。
In this study, cyclic shear test were conducted on the crusted structural surface replicated with similar material under normal stress. The shear strength, deformation and morphology evolution characteristics of joints under cyclic shearing were studied without filling, with 3 mm yellow mud infilling, 3 mm plaster infilling and 3 mm detritus infilling, respectively. It was found that the failure mode of joints developed under cyclic shearing. Joints without filling changed from shear failure to wear-out failure, while joints with yellow mud mainly showed slip failure. Joints with plaster changed from shear failure to slip failure and then to wear-out failure, while joints with detritus changed from shear failure to wear-out failure. With the increase of cyclic shear times, the peak shear stress of joints without filling and with yellow mud infilling decreased in deceleration rate, while those with plaster and detritus infilling decreased firstly and then increased in deceleration rate. These results indicate that filling material can weaken the shear strength of joints under cyclic shearing, especially for those with yellow mud filling. Under different filling conditions, the average dilation angles all reduce in deceleration rate under cyclic shearing. The shearing shrinkage is more obvious in filled joints, in which the shearing shrinkage is the smallest with yellow mud infilling and the largest with plaster infilling. The wear degree of filled joints after cyclic shear is lighter than that of unfilled joints, while the wear degree is the smallest when filling yellow mud, the wear degree is relatively biggest when filling plaster.
In this study, cyclic shear test were conducted on the crusted structural surface replicated with similar material under normal stress. The shear strength, deformation and morphology evolution characteristics of joints under cyclic shearing were studied without filling, with 3 mm yellow mud infilling, 3 mm plaster infilling and 3 mm detritus infilling, respectively. It was found that the failure mode of joints developed under cyclic shearing. Joints without filling changed from shear failure to wear-out failure, while joints with yellow mud mainly showed slip failure. Joints with plaster changed from shear failure to slip failure and then to wear-out failure, while joints with detritus changed from shear failure to wear-out failure. With the increase of cyclic shear times, the peak shear stress of joints without filling and with yellow mud infilling decreased in deceleration rate, while those with plaster and detritus infilling decreased firstly and then increased in deceleration rate. These results indicate that filling material can weaken the shear strength of joints under cyclic shearing, especially for those with yellow mud filling. Under different filling conditions, the average dilation angles all reduce in deceleration rate under cyclic shearing. The shearing shrinkage is more obvious in filled joints, in which the shearing shrinkage is the smallest with yellow mud infilling and the largest with plaster infilling. The wear degree of filled joints after cyclic shear is lighter than that of unfilled joints, while the wear degree is the smallest when filling yellow mud, the wear degree is relatively biggest when filling plaster.
引文
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[14]夏才初,孙宗颀.工程岩体节理力学[M].上海:同济大学出版社,2002.XIA Cai-chu,SUN Zong-jie.Joint mechanics of engineering rock mass[M].Shanghai:Tongji University Press,2002.
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[16]许江,刘义鑫,尹光志,等.煤岩剪切-渗流耦合试验装置研制[J].岩石力学与工程学报,2015,34(增刊1):2987-2995.XU Jiang,LIU Yi-xin,YIN Guang-zhi,et al.Development of shear-flow coupling test device for coal rock[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(Suppl:1):2987-2995.
[17]BARTON N,CHOUBEY V.The shear strength of rock joints in theory and practice[J].Rock Mechanics,1977,10(1-2):1-54.
[18]丁增志.节理表面形貌研究及在非贯通节理岩体强度准则中的应用[D].上海:同济大学,2007.DING Zeng-zhi.Study of joint surface topography and application in strength criterion of rockmass containing discontinuous joints[D].Shanghai:Tongji University,2007.
[19]ZHAO J.Joint surface matching and shear strength,part A:joint matching coefficient(JMC)[J].International Journal of Rock Mechanics and Mining Sciences,1997,34(2):173-178.
[2]李海波,蒋会军,赵坚,等.动荷载作用下岩体工程安全的几个问题[J].岩石力学与工程学报,2003,22(11):1887-1891.LI Hai-bo,JIANG Hui-jun,ZHAO Jian,et al.Some problems about safety analysis of rock engineering under dynamic load[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(11):1887-1891.
[3]JAFARI M K,HOSSEINI K A,PELLET F,et al.Evaluation of shear strength of rock joints subjected to cyclic loading[J].Soil Dynamics&Earthquake Engineering,2003,23(7):619-630.
[4]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&Rock Engineering,2014,47(5):1931-1938.
[5]LEE H S,PARK Y J,CHO T F,et al.Influence of asperity degradation on the mechanical behavior of rough rock joints under cyclic shear loading[J].International Journal of Rock Mechanics&Mining Sciences,2001,38(7):967-980.
[6]HOMAND F,BELEM T,SOULEY M.Friction and degradation of rock joint surfaces under shear loads[J].International Journal for Numerical&Analytical Methods in Geomechanics,2001,25(10):973-999.
[7]刘博,李海波,刘亚群.循环剪切荷载作用下岩石节理变形特性试验研究[J].岩土力学,2013,34(9):2475-2481,2488.LIU Bo,LI Hai-bo,LIU Ya-qun.Experimental study of deformation behavior of rock joints under cyclic shear loading[J].Rock and Soil Mechanics,2013,34(9):2475-2481,2488.
[8]刘博,李海波,朱小明.循环剪切荷载作用下岩石节理强度劣化规律试验模拟研究[J].岩石力学与工程学报,2011,30(10):2033-2039.LIU Bo,LI Hai-bo,ZHU Xiao-ming.Experiment simulation study of strength degradation of rock joints under cyclic shear loading[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(10):2033-2039.
[9]刘博,李海波,刘亚群,等.循环荷载作用下节理凸起体概化破坏模型及剪切强度计算分析[J].岩石力学与工程学报,2013,32(增刊2):3000-3008.LIU Bo,LI Hai-bo,LIU Ya-qun,et al.Generalized damage model for asperity and shear strength calculation of joints under cyclic shear loading[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(Suppl.2):3000-3008.
[10]JAHANIAN H,SADAGHIANI M H.Experimental study on the shear strength of sandy clay infilled regular rough rock joints[J].Rock Mechanics&Rock Engineering,2015,48(3):907-922.
[11]刘婷婷,李建春,李海波,等.剪切速率对平直充填节理的剪切力学特性影响研究[J].岩土力学,2017,38(7):1967-1973.LIU Ting-ting,LI Jian-chun,LI Hai-bo,et al.Study of influence of shear velocity on shear mechanical properties of planar filled joint[J].Rock and Soil Mechanics,2017,38(7):1967-1973.
[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&Rock Engineering,2014,47(4):1373-1391.
[13]杜守继,江崎哲郎,蒋宇静,等.岩石节理的剪切破坏特性的定量分析[C]//中国岩石力学与工程学会第五次学术大会.1998:239-244.DU Shou-ji,TETSURO E,JIANG Yu-jing,et al.The quantitative evaluation of surface damage of rock joint during shear processes[C]//The 7th Academic Congress of Chinese Society for Rock Mechanics and Engineering.Beijing:China Science and Technology Press,1998:239-244.
[14]夏才初,孙宗颀.工程岩体节理力学[M].上海:同济大学出版社,2002.XIA Cai-chu,SUN Zong-jie.Joint mechanics of engineering rock mass[M].Shanghai:Tongji University Press,2002.
[15]中华人民共和国建设部.GB/T 50081-2002普通混凝土力学性能试验方法标准[M].北京:中国建筑工业出版社,2003.Ministry of Construction of the People’s Republic of China.GB/T 50081-2002 Standard for test method of mechanical properties on ordinary concrete[M].Beijing:China Construction Industry Press,2003.
[16]许江,刘义鑫,尹光志,等.煤岩剪切-渗流耦合试验装置研制[J].岩石力学与工程学报,2015,34(增刊1):2987-2995.XU Jiang,LIU Yi-xin,YIN Guang-zhi,et al.Development of shear-flow coupling test device for coal rock[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(Suppl:1):2987-2995.
[17]BARTON N,CHOUBEY V.The shear strength of rock joints in theory and practice[J].Rock Mechanics,1977,10(1-2):1-54.
[18]丁增志.节理表面形貌研究及在非贯通节理岩体强度准则中的应用[D].上海:同济大学,2007.DING Zeng-zhi.Study of joint surface topography and application in strength criterion of rockmass containing discontinuous joints[D].Shanghai:Tongji University,2007.
[19]ZHAO J.Joint surface matching and shear strength,part A:joint matching coefficient(JMC)[J].International Journal of Rock Mechanics and Mining Sciences,1997,34(2):173-178.