超高周疲劳作用下花岗岩裂纹演化过程研究
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摘要
为探索超高周疲劳作用下花岗岩内部裂纹的演化机理,构建符合矿物实际分布特征的颗粒流模型,对其进行超声疲劳加载,通过超声疲劳试验加以验证。结果表明:超高周疲劳作用下,花岗岩微裂纹主要由拉张应力机制产生的。在宏观裂纹出现前,矿物晶体边界微裂纹占主导,随宏观裂纹出现,晶内裂纹占比逐渐增大并处于主导地位。
To explore the evolution mechanism of cracks inside granite under ultra-high cycle fatigue,the particle flow code(PFC) in line with actual distribution characteristics of minerals,was established,and then was loaded by ultrasonic fatigue and verified by ultrasonic fatigue test.The result shows that,under the action of ultra-high cycle fatigue,the microcracks inside granite are caused by tensile stress mechanism mainly and,before the occurrence of macrocracks,the microcracks dominate over the boundary of mineral crystal,and then as the macrocracks arise,the intragranular cracks gradually have more share till play a dominant role.
To explore the evolution mechanism of cracks inside granite under ultra-high cycle fatigue,the particle flow code(PFC) in line with actual distribution characteristics of minerals,was established,and then was loaded by ultrasonic fatigue and verified by ultrasonic fatigue test.The result shows that,under the action of ultra-high cycle fatigue,the microcracks inside granite are caused by tensile stress mechanism mainly and,before the occurrence of macrocracks,the microcracks dominate over the boundary of mineral crystal,and then as the macrocracks arise,the intragranular cracks gradually have more share till play a dominant role.
引文
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[3]杨威,李磊,赵延旭,等.共振碎岩理论的初步探究[J].能源技术与管理,2007(4):7-9.YANG W,LI L,ZHAO Y X,et al.Resonates the detritus the preliminary study[J].Energy Technology and Management,2007(4):7-9.
[4]张国凯,李海波,夏祥,等.岩石细观结构及参数对宏观力学特性及破坏演化的影响[J].岩石力学与工程学报,2016,35(7):1341-1352.ZHANG G K,LI H B,XIA X,et al.Effects of microstructure and micro parameters on macro mechanical properties and failure of rock[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(7):1341-1352.
[5]于庆磊,杨天鸿,郑超,等.岩石细观结构对其变形强度影响的数值分析[J].岩土力学,2011,32(11):3468-3472.YU Q L,YANG T H,ZHENG C,et al.Numerical analysis of influence of rock mesostructure on its deformation and strength[J].Rock and Soil Mechanics,2011,32(11):3468-3472.
[6]Cundall P A,Strack O D L.A discrete numerical model for granular assemblies[J].Géotechnique,1979,29(1):47-65.
[7]Cundall PA,Hart R D.Numerical modelling of discontinua[J].Engineering Computations,1992,9(2):101-113.
[8]ITASCA Consulting Group.PFC2D(particle flow code in 2 dimensions)Theory and Background[M].Minnesota:ITASCA Consulting Group Inc.,2002:20-35.
[9]王宏宇,李博,李旭东.浅谈PFC软件在岩土工程中的应用[J].西部交通科技,2015(7):68-74,112.WANG H Y,LI B,LI X D.Discussions on the application of PFC software in geotechnical engineering[J].Western China Communication Science&Technology,2015(7):68-74,112.
[10]朴香兰,郭越.PFC 3D程序及其在工程领域中的应用[J].选煤技术,2013(1):79-83.PIAO X L,GUO Y.PFC 3D program and its application in engineering field[J].Coal Preparation Technology,2013(1):79-83.
[11]周喻,高永涛,吴顺川,等.等效晶质模型及岩石力学特征细观研究[J].岩石力学与工程学报,2015,34(3):511-519.ZHOU Y,GAO Y T,WU S C,et al.An equivalent crystal model for mesoscopic behaviour of rock[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(3):511-519.
[12]Potyondy D O,Cundall PA.A bonded-particle model for rock[J].International Journal of Rock Mechanics and Mining Sciences,2004,41(8):1329-1364.
[13]Ivars D M,Pierce M E,Darcel C,et al.The synthetic rock mass approach for jointed rock mass modelling[J].International Journal of Rock Mechanics and Mining Sciences,201l,48(2):219-244.
[14]Sch9pfer M PJ,Childs C.The orientation and dilatancy of shear bands in a bonded particle model for rock[J].International Journal of Rock Mechanics and Mining Sciences,2013,57:75-88.
[15]唐春安,刘红元,秦四清,等.非均匀性对岩石介质中裂纹扩展模式的影响[J].地球物理学报,2000,43(1):116-121.TANG C A,LIU H Y,QIN S Q,et al.Influence of Heterogeneity on Crack Propagation Modes in Brittle Rock[J].Chinese Journal of Geophysics,2000,43(1):116-121.