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| RESEARCH ON MICRO-MESO CHARACTERISTICS OF GRANITE FRACTURE UNDER UNIAXIAL COMPRESSION AT LOW AND INTERMEDIATE STRAIN RATES |
| LIANG Changyu1，2，WU Shuren1，2，LI Xiao3 |
| (1. Key Laboratory of Neotectonics Movement and Geohazards，Ministry of Land and Resources，Institute of Geomechanics，Chinese Academy of Geological Sciences，Beijing 100081，China；2. Institute of Geomechanics，Chinese Academy of Geological Sciences，Beijing 100081，China；3. Key Laboratory of Engineering Geomechanics，Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029，China) |
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Abstract The macroscopic fracture modes and the micro-meso morphology are the important characteristics to represent rock failure mechanism. The shear failure mode is the main macro fracture mode of the granite under low and intermediate strain rates. The mesoscopic morphology was studied using scanning electron microscope(SEM) and 3D laser scanner，and the roughness of the fractured surface was quantitatively studied based on fractal theory. The research results show that with increasing strain rates，the main fracture modes change from intergranular fracture，intergranular fracture and cleavage fracture，transgranular with curved path to transgranular with straight path. Based on the research results of micro-meso fracture modes，it has been concluded that the difference of strain rates leads to the difference of energy absorption and the differences of the fracture morphology of rock，which finally leads to the rate sensitivity of rock strength.
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| [1] ZHAO J，LI H，WU M，et al. Dynamic uniaxial compression tests on a granite[J]. International Journal of Rock Mechanics and Mining Sciences，1999，36(2)：273–277.
[2] LI X，LOK T，ZHAO J. Dynamic characteristics of granite subjected to intermediate loading rate[J]. Rock Mechanics and Rock Engineering，2005，38(1)：21–39.
[3] LI H，ZHAO J，LI J，et al. Experimental studies on the strength of different rock types under dynamic compression[J]. International Journal of Rock Mechanics and Mining Sciences，2004，41(1)：68–73.
[4] 李海波，赵 坚，李俊如，等. 花岗岩动态压缩力学特性的实验以及理论研究[J]. 辽宁工程技术大学学报：自然科学版，2001，20(4)：474–477.(LI Haibo，ZHAO Jian，LI Junru，et al. Experimental and theoretical study on dynamic compressive mechenical properties of granite[J]. Journal of Liaoning Technical University：Natural Science，2001，20(4)：474–477.(in Chinese))
[5] 李海波，王建伟，李俊如，等. 单轴压缩下软岩的动态力学特性试验研究[J]. 岩土力学，2004，25(1)：1–4.(LI Haibo，WANG Jianwei，LI Junru，et al. Mechanical properties of soft rock under dynamic uniaxial compression[J]. Rock and Soil Mechanics，2004，25(1)：1–4.(in Chinese))
[6] ZHANG Z X，KOU S Q，JIANG L G，et al. Effects of loading rate on rock fracture：fracture characteristics and energy partitioning[J]. International Journal of Rock Mechanics and Mining Sciences，2000，37(5)：745–762.
[7] ZHANG Q B，ZHAO J. Effect of loading rate on fracture toughness and failure micromechanisms in marble[J]. Engineering Fracture Mechanics，102：288–309.
[8] CAI M，KAISER P K，TASAKA Y，el al. Generalized crack initiation and crack damage stress thresholds of brittle rock masses near underground excavations[J]. International Journal of Rock Mechanics and Mining Sciences，2004，41(5)：833–847.
[9] 翟 越，马国伟，赵均海，等. 花岗岩在单轴冲击压缩荷载下的动态断裂分析[J]. 岩土工程学报，2007，29(3)：385–390.(ZHAI Yue，MA Guowei，ZHAO Junhai，et al. Dynamic failure analysis on granite under uniaxial Impact compressive load[J]. Chinese Journal of Geotechnical Engineering，2007，29(3)：385–390.(in Chinese))
[10] 黄 达，黄润秋，张永兴. 粗晶大理岩单轴压缩力学特性的静态加载速率相应及能量机制试验研究[J]. 岩石力学与工程学报，2012，31(2)：245–255.(HUANG Da，HUANG Runqiu，ZHANG Yongxing. Experimental investigations on static loading rate effects on mechanical properties and energy mechanism of coarse csrystal grain marble under uniaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(2)：245–255.(in Chinese))
[11] 梁昌玉，李 晓，王声星，等. 岩石单轴压缩应力–应变特征的率相关性及能量机制试验研究[J]. 岩石力学与工程学报，2012，31(9)：1 830–1 838.(LIANG Changyu，LI Xiao，WANG Shengxing，et al. Experimental investigations on rate-dependent stress-strain characteristics and energy mechanism of rock under uniaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(9)：1 830– 1 838.(in Chinese))
[12] 梁昌玉，李 晓，张 辉，等. 中低应变率范围内花岗岩单轴压缩特性的尺寸效应研究[J]. 岩石力学与工程学报，2013，32(3)：528–536.(LIANG Changyu，LI Xiao，ZHANG Hui，et al. Research on size effects of uniaxial compression of granite under low and intermediate strain rates[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(3)：528–536.(in Chinese))
[13] ARAKAWA K，TAKAHASHI K. Relationships between fracture parameters and fracture surface roughness of brittle polymers[J]. International Journal of Fracture，1991，48(2)：103–114.
[14] SHARON E，GROSS S P，FINEBERG J. Energy dissipation in dynamic fracture[J]. Physical Review Letters，1996，76(12)：2 117– 2 120.
[15] KRANZ R L. Microcracks in rocks：a review[J]. Tectonophysics，1983，100(1)：449–480.
[16] HALLBAUER D K，WAGNER H，COOK N G W. Some observations concerning the microscopic and mechanical behaviour of quartzite specimens in stiff，triaxial compression tests[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1973，10(6)：713–726.
[17] HORII H，NEMAT-NASSER S. Compression-induced microcrack growth in brittle solids：axial splitting and shear failure[J]. Journal of Geophysical Research：Solid Earth(1978–2012)，1985，90(B4)：3 105–3 125.
[18] JEONG G C，ICHIKAWA Y，KAWAMOTO T. Direct observation of microcracking and subsequent failure in quartz–feldspar rock(bisphere) under uniaxial compression[C]// Proceedings of International Symposium on Assessment and Prevention of Failure Phenomena in Rock Engineering Istambul. Rotterdam：Balkema，1993：335–341.
[19] 李先炜，兰勇瑞，邹俊兴. 岩石断口分析[J]. 中国矿业大学学报，1983，12(1)：15–21.(LI Xianwei，LAN Yongrui，ZOU Junxing. A study of rock fractures[J]. Journal of China University of Mining and Technology，1983，12(1)：15–21.(in Chinese))
[20] 李育枢，郑建国，李天斌. 电站隧洞岩爆岩石的微观破坏力学机制分析[J]. 水力发电，2006，32(8)：17–20.(LI Yushu，ZHENG Jianguo，LI Tianbin. The microsomic failure mechanism analysis of rock in rock burst area in the tunnel of a hysroelectric power station[J]. Journal of Hydroelectric Engineering，2006，32(8)：17–20.(in Chinese))
[21] 张宗贤，俞 洁. 岩石动静态断裂面的微观特征[J]. 中国有色金属学报，1995，5(4)：21–24.(ZHANG Zongxian，YU Jie. Micro- characteristic of the fractured surface of rock under static and dynamic loading[J]. The Chinese Journal of Nonferrous Metal，1995，5(4)：21–24.(in Chinese))
[22] ZHANG Q B，ZHAO J. Effect of loading rate on fracture toughness and failure micromechanisms in marble[J]. Engineering Fracture Mechanics，2013，102：288–309.
[23] 刘彩平，段庆全，彭瑞东. 岩石动态断裂耗能机制的形貌学分析[J]. 金属世界，2009，(1)：22–25.(LIU Caiping，DUAN Qingquan，PENG Ruidong. Fractograph analysis on dynamic fracture of rock[J]. Metal World Metal World，2009，(1)：22–25.(in Chinese))
[24] HULL D. Fractography：observing，measuring and interpreting fracture surface topography[M]. Cambridge：Cambridge University Press，1999：259–291.
[25] ISRM. Suggested methods for determining the uniaxial compressive strength and deformability of rock materials[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1979，16(2)：138–140. |
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2015, Vol. 34 
