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| FAILURE CHARACTERISTICS OF ROCK WITH TWO PRE-EXISTING TRANSFIXION CRACKS UNDER TRIAXIAL COMPRESSION |
| XIAO Taoli1，2，LI Xinping2，JIA Shanpo1 |
| (1. Rock and Soil Mechanics Engineering Research Center，Yangtze University，Jingzhou，Hubei 434023，China；2. Key Laboratory of Roadway Bridge and Structure Engineering，Wuhan University of Technology，Wuhan，Hubei 430070，China) |
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Abstract Rock-like specimens were made in the laboratory to have two pre-existing transfixion cracks of designated size and inclination. The failure characteristics of the specimens were studied using conventional triaxial compression tests. The macroscopic fracture trace of the samples shows the characteristics of coplanar cracks，anti-wing cracks and wing cracks. The two pre-existing cracks may be linked by stretching coalescence or shear coalescence，or one crack may propagate to link with the other via an anti-wing crack，or the two pre-existing cracks may not be linked. Under triaxial loading conditions，the anti-wing crack is the major propagation crack，which affects the final failure mode of the samples. The arrangement of the two pre-existing cracks and the confining pressure are the two main factors that dictate the final failure mechanism of the specimens. The axial stress-strain curves of the samples show multi-peak characteristics under triaxial loading conditions and the deformation characteristics change from brittle behaviour under low confining pressure to more ductile under high confining pressure conditions. Under high confining pressure，the dilation is insignificant or almost nonexistent. The axial stress-strain curves are closely related to the processes of fracture initiation，fracture propagation and fracture coalescence.
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| [1] 肖桃李，李新平，郭运华. 三轴压缩条件下单裂隙岩石的破坏特性研究[J]. 岩土力学，2012，33(11)：3 251–3 261.(XIAO Taoli，LI Xinping，GUO Yunhua. Experimental study of failure characteristic of single jointed rock mass under triaxial compression tests[J]. Rock and Soil Mechanics，2012，33(11)：3 251–3 261.(in Chinese))
[2] REYES O，EINSTEIN H H. Failure mechanisms of fractured rock–a fracture coalescence model[C]// Proceedings of the 7th International Congress on Rock Mechanics. Aachen，Germany：[s.n.]，1991：333–340.
[3] 李银平，王元汉，陈龙珠，等. 含预制裂纹大理岩的压剪试验分析[J]. 岩土工程学报，2004，26(1)：120–124.(LI Yinping，WANG Yuanhan，CHEN Longzhu，et al. Experimental research on pre- existing cracks in marble under compression[J]. Chinese Journal of Geotechnical Engineering，2004，26(1)：120–124.(in Chinese))
[4] 蒲成志，曹 平，衣永亮. 单轴压缩下预制2条贯通裂隙类岩材料断裂行为[J]. 中南大学学报：自然科学版，2012，43(7)：2 708–2 716. (PU Chengzhi，CAO Ping，YI Yongliang. Fracture for rock-like materials with two transfixion fissures under uniaxial compression[J]. Journal of Central South University：Science and Technology，2012，43(7)：2 708–2 716.(in Chinese))
[5] 靳 瑾，曹 平，蒲成志. 预制裂隙几何参数对类岩材料破坏模式及强度的影响[J]. 中南大学学报：自然科学版，2014，45(2)：529–535.(JIN Jin，CAO Ping，PU Chengzhi. Influence of flaw parameters on damage mode and strength of rock-like materials[J]. Journal of Central South University：Science and Technology，2014，45(2)：529–535.(in Chinese))
[6] BOBET A，EINSTEIN H H. Fracture coalescence in rock-type material under uniaxial and biaxial compression[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1998，35(7)：836–888.
[7] BOBET A. The initiation of secondary cracks in compression[J]. Engineering Fracture Mechanics，2000，66 (2)：187–219.
[8] WONG R H C，CHAU K T. Crack coalescence in a rock-like material containing two cracks[J]. International Journal of Rock Mechanics and Mining Sciences，1998，35 (2)：147–164.
[9] WONG R H C，LEUNG W L，WANG S W. Shear strength studies on rock-link models containing arrayed open joints[C]// Proceedings of Rock Mechanics in National Interest. [S.l.]：[s.n.]，2001：843–849.
[10] 杨圣奇，温 森，李良权. 不同围压下断续预制裂纹粗晶大理岩变形和强度特性的试验研究[J]. 岩石力学与工程学报，2007，26(8)：1 573–1 587.(YANG Shengqi，WEN Sen，LI Liangquan. Experimental study on deformation and strength properties of coarse marble with discontinuous pre-existing cracks under different confining pressures[J]. Rock and Soil Mechanics，2007，26(8)：1 573–1 587.(in Chinese))
[11] 杨圣奇，蒋昱州，温 森. 两条断续预制裂纹粗晶大理岩强度参数的研究[J]. 工程力学，2008，25(12)：127–134.(YANG Shengqi，JIANG Yuzhou，WEN Sen. Study on the strength parameters of coarse marble with two pre-existing cracks[J]. Engineering Mechanics，2008，25(12)：127–134.(in Chinese))
[12] 李 凡，李雪峰. 两条雁行预制裂隙贯通机制的细观数值模拟[J]. 深圳大学学报理工版，2013，30(2)：190–194.(LI Fan，LI Xuefeng. Micro-numerical simulation on mechanism of fracture coalescence between two pre-existing flaws arranged in echelon[J]. Journal of Shenzhen University Science and Engineering，2013，30(2)：190–194.(in Chinese))
[13] 杨圣奇，黄彦华，刘相如. 断续双裂隙岩石抗拉强度与裂纹扩展颗粒流分析[J]. 中国矿业大学学报，2014，43(2)：220–226.(YANG Shengqi，HUANG Yanhua，LIU Xiangru. Particle flow analysis on tensile strength and crack coalescence behavior of brittle rock containing two pre-existing fissures[J]. Journal of China University of Mining and Technology，2014，43(2)：220–226.(in Chinese))
[14] 黄彦华，杨圣奇. 非共面双裂隙红砂岩宏细观力学行为颗粒流模拟[J]. 岩石力学与工程学报，2014，33(8)：1 644–1 653.(HUANG Yanhua，YANG Shengqi. Particle flow simulation of macro-and meso-mechanical behavior of red sandstone containing two pre-existing non-coplanar fissures[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(8)：1 644–1 653.(in Chinese))
[15] 蒋明镜，陈 贺，张 宁，等. 含双裂隙岩石裂纹演化机制的离散元数值分析[J]. 岩土力学，2014，35(11)：3 259–3 268.(JIANG Mingjing，CHEN He，ZHANG Ning，et al. Distinct element numerical analysis of crack evolution in rocks containing pre-existing double flaw[J]. Rock and Soil Mechanics，2014，35(11)：3 259–3 268.(in Chinese))
[16] 张 平，李 宁，贺若兰，等. 动载下两条断续预制裂隙贯通机制研究[J]. 岩石力学与工程学报，2006，25(6)：1 210–1 217.(ZHANG Ping，LI Ning，HE Ruolan，et al. Mechanism of fracture coalescence between two pre-existing flaws under dynamic loading[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(6)：1 210– 1 217.(in Chinese))
[17] 李新平，肖桃李，汪 斌，等. 锦屏大理岩不同应力路径下加卸载试验研究[J]. 岩石力学与工程学报，2012，31(5)：882–889.(LI Xingping，XIAO Taoli，WANG Bin，et al. Experimental study of Jinping marble under loading and unloading stress paths[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(5)：882–889. (in Chinese))
[18] 肖桃李，李新平，贾善坡. 深部单裂隙岩体结构面效应的三轴试验研究与力学分析[J]. 岩石力学与工程学报，2012，31(8)：1 666– 1 673.(XIAO Taoli，LI Xinping，JIA Shangpo. Triaxial test research and mechanical analysis based on structure surface effect of deep rock mass with single fissure[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(8)：1 666–1 673.(in Chinese))
[19] 李晓红，卢义玉，康 勇，等. 岩石力学实验模拟技术[M]. 北京：科学出版社，2007：6–24.(LI Xiaohong，LU Yiyu，KANG Yong，et al. Simulation experiment technique of rock mechanics[M]. Beijing：Science Press，2007：6–24.(in Chinese))
[20] WONG R H C，LAWA C M，CHAUA K T，et al. Crack propagation from 3D surface fractures in PMMA and marble specimens under uniaxial compression[J]. International Journal of Rock Mechanics and Mining Sciences，2004，41(3)：37–42.
[21] 郭彦双，黄凯珠，朱维申，等. 辉长岩中张开型表面裂隙破裂模式研究[J]. 岩石力学与工程学报，2007，26(3)：525–531.(GUO Yanshuang，WONG R C H，ZHU Weishen，et al. Study on fracture pattern of open surface-flaw in gabbro[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(3)：525–531.(in Chinese))
[22] 梁正召，李连崇，唐世斌，等. 岩石三维表面裂纹扩展机制数值模拟研究[J]. 岩土工程学报，2011，33(10)：1 615–1 622.(LIANG Zhengzhao，LI Liancong，TANG Shibin，et al. 3D numerical simulation of growth of surface crack of rock specimens[J]. Chinese Journal of Geotechnical Engineering，2011，33(10)：1 615–1 622.(in Chinese)) |
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2015, Vol. 34 
