|
|
|
| Influence of volumetric strain ratio on the fatigue characteristics of Beishan granite |
| HUANG Zhengjun1，2，ZHAO Xingguang3，LI Yuan1，2，CAI Meifeng1，2 |
(1. School of Civil and Resource Engineering，University of Science and Technology Beijing，Beijing 100083，China；2. Key Laboratory for High-Efficient Mining and Safety of Metal Mines，Ministry of Education，University of Science and Technology Beijing，Beijing 100083，China；3. Beijing Research Institute of Uranium Geology，Beijing 100029，China)
|
|
|
|
|
Abstract Dynamic triaxial cyclic loading-unloading tests on Beishan granite were performed using the rock mechanical test system MTS815. The main objective is to investigate the influence of the volumetric strain ratio on the fatigue characteristics of the rock. For each test，the volumetric strain at the threshold of crack damage stress was identified in the static loading stage. The fatigue initiation and the volumetric strain ratio were subsequently determined by measuring the variation of the volumetric strain for each specimen. The mechanical parameters were further obtained during dynamic loading. Then，the development of fatigue and damage behaviors of the specimens were revealed under different volumetric strain ratios. The instantaneous strains and the maximum plastic strains at failure are found not sensitive to the volumetric strain ratio. With the increasing of loading-unloading cycles，the plastic volumetric deformation presents three characteristic stages. In the stage of uniform deformation rate，the plastic volumetric strain rate and the Young?s modulus decrease nonlinearly with the increase of volumetric strain ratio. The plastic volumetric strain and the Young?s modulus were used to define the damage variables，which describe reasonably the damage process of the tested rock. Moreover，in the steady stage of damage development，the damage velocity of the specimens increases with the increasing of volumetric strain ratio. Different volumetric strain ratios lead to the difference of initial damage for specimens before dynamic fatigue testing. Hence，the fatigue life decreases significantly with the increasing of volumetric strain ratio.
|
|
|
|
|
|
[1] 王者超，赵建纲，李术才，等. 循环荷载作用下花岗岩疲劳力学性质及其本构模型[J]. 岩石力学与工程学报，2012，31(9)：1 888–1 900. (WANG Zhechao，ZHAO Jiangang，LI Shucai，et al. Fatigue mechanical behavior of granite subjected to cyclic load and its constitutive model[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(9)：1 888–1 900.(in Chinese))
[2] 卢高明，李元辉. 围压对黄砂岩疲劳破坏变形特性的影响[J]. 岩土力学，2016，37(7)：1 847–1 856.(LU Gaoming，LI Yuanhui. Influence of confining pressure on fatigue deformation properties of yellow sandstone[J]. Rock and Soil Mechanics，2016，37(7)：1 847–1 856. (in Chinese))
[3] ATTEWELL P B，FARMER I W. Fatigue behaviour of rock[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1973，10(1)：1–9.
[4] SINGH S K. Fatigue and strain hardening behaviour of graywacke from the Flagstaff Formation，New South Wales[J]. Engineering Geology，1989，26(2)：171–179.
[5] TIEN Y M，LEE D H，JUANG C H. Strain，pore pressure and fatigue characteristics of sandstone under various load conditions[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1990，27(4)：283–289.
[6] TAO Z Y，MO H H. An experimental study and analysis of the behaviour of rock under cyclic loading[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1990，27(1)：51–56.
[7] BAGDE M N，PETROŠ V. Fatigue properties of intact sandstone samples subjected to dynamic uniaxial cyclical loading[J]. International Journal of Rock Mechanics and Mining Sciences，2005，42(2)：237–250.
[8] BAGDE M N，PETROŠ V. Waveform effect on fatigue properties of intact sandstone in uniaxial cyclical loading[J]. Rock Mechanics and Rock Engineering，2005，38(3)：169–196.
[9] RAY S K，SARKAR M，SINGH T N. Effect of cyclic loading and strain rate on the mechanical behaviour of sandstone[J]. International Journal of Rock Mechanics and Mining Sciences，1999，36(4)：543–549.
[10] TAHERI A，ROYLE A，YANG Z，et al. Study on variations of peak strength of a sandstone during cyclic loading[J]. Geomechanics and Geophysics for Geo-Energy and Geo-Resources，2016，2(1)：1–10.
[11] 葛修润，蒋 宇，卢允德，等. 周期荷载作用下岩石疲劳变形特性试验研究[J]. 岩石力学与工程学报，2003，22(10)：1 581–1 585.(GE Xiurun，JIANG Yu，LU Yunde，et al. Testing study on fatigue deformation law of rock under cyclic loading[J]. Chinese Journal of Rock Mechanics and Engineering，2003，22(10)：1 581–1 585.(in Chinese))
[12] 席道瑛，刘云平，刘小燕，等. 疲劳载荷对岩石物理力学性质的影响[J]. 岩土工程学报，2001，23(3)：292–295.(XI Daoying，LIU Yunping，LIU Xiaoyan，et al. Influence of fatigue loading on physical mechanical characteristics of rock[J]. Chinese Journal of Geotechnical Engineering，2001，23(3)：292–295.(in Chinese))
[13] 蒋 宇，葛修润，任建喜. 岩石疲劳破坏过程中的变形规律及声发射特性[J]. 岩石力学与工程学报，2004，23(11)：1 810–1 814. (JIANG Yu，GE Xiurun，REN Jianxi，et al. Deformation rules and acoustic emission characteristics of rocks in process of fatigue failure[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(11)：1 810–1 814.(in Chinese))
[14] CHEN Y Q，WATANABE K，KUSUDA H，et al. Crack growth in Westerly granite during a cyclic loading test[J]. Engineering Geology，2011，117(3/4)：189–197.
[15] XIAO J Q，DING D X，XU G，et al. Inverted S-shaped model for nonlinear fatigue damage of rock[J]. International Journal of Rock Mechanics and Mining Sciences，2009，46(3)：643–648.
[16] XIAO J Q，DING D X，JIANG F L，et al. Fatigue damage variable and evolution of rock subjected to cyclic loading[J]. International Journal of Rock Mechanics and Mining Sciences，2010，47(3)：461–468.
[17] WANG Z C，LI S C，QIAO L P，et al. Fatigue behavior of granite subjected to cyclic loading under triaxial compression condition[J]. Rock Mechanics and Rock Engineering，2013，46(6)：1 603–1 615.
[18] STRECKEISEN A L. To each plutonic rock its proper name[J]. Earth-Science Reviews，1976，12(1)：1–33.
[19] 赵星光，马利科，苏 锐，等. 北山深部花岗岩在压缩条件下的破裂演化与强度特性[J]. 岩石力学与工程学报，2014，33(增2)：3 665– 3 675.(ZHAO Xingguang，MA Like，SU Rui，et al. Fracture evolution and strength characteristics of Beishan deep granite under compression conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(Supp.2)：3 665–3 675.(in Chinese))
[20] MARTIN C D，CHANDLER N A. The progressive fracture of Lac du Bonnet granite[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1994，31(6)：643–659.
[21] ZHAO X G，CAI M. A mobilized dilation angle model for rocks[J]. International Journal of Rock Mechanics and Mining Sciences，2010，47(3)：368–384.
[22] ZHAO X G，CAI M. Influence of plastic shear strain and confinement-dependent rock dilation on rock failure and displacement near an excavation boundary[J]. International Journal of Rock Mechanics and Mining Sciences，2010，47(5)：723–738.
[23] EBERHARDT E，STEAD D，STIMPSON B. Quantifying progressive pre-peak brittle fracture damage in rock during uniaxial compression[J]. International Journal of Rock Mechanics and Mining Sciences，1999，36(3)：361–380.
[24] LIU E L，HE S M. Effects of cyclic dynamic loading on the mechanical properties of intact rock samples under confining pressure conditions[J]. Engineering Geology，2012，125(27)：81–91. |
|
|
|
2018, Vol. 37 
