含单裂纹真实岩石试件断裂模式的力学试验研究

doi:10.13722/j.cnki.jrme.2015.0710

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摘要为研究岩石单裂纹试样断裂特性，通过在真实岩石试样中预制了45°单裂纹，基于MTS815.03电液伺服岩石试验机，进行围压分别为0，5，10 MPa的力学试验，分析围压对裂纹扩展断裂模式的影响规律，根据断裂力学理论建立裂纹扩展力学模型，基于最大径向剪应力准则获得次生裂纹理论起裂角。结果表明：(1) 裂纹初始断裂时具有明显的前兆信息，在全应力–应变曲线上表现为明显的应力降现象；(2) 试验结果中观察到了I型翼裂纹、II型反翼裂纹以及II型次生共面裂纹，试验中得翼裂纹起裂角为68°～73°，反翼倾斜裂纹起裂角为－119°～－125°，裂纹起裂角理论结果为0°，70.5°，－123.8°，试验结果与理论计算结果基本相符；(3) 起裂应力为峰值应力的90%～95%，细砂岩试样抗压强度峰值与围压存在较好的线性关系，拟合得?c = 2.69?3+61.9，相关系数R2 = 0.97；(4) 裂纹断裂具有明显的围压效应，围压为0 MPa时，断裂模式为翼裂纹和次生倾斜反翼裂纹，翼裂纹以弯曲路径扩展，扩展渐近线朝向轴向加载方向，反翼裂纹近直线扩展；围压为5 MPa时，试样为反翼裂纹断裂模式；围压为10 MPa时，试样为反翼裂纹与次生共面裂纹断裂模式。

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	刘伟韬1
	申建军2

关键词 ：岩石力学, 断裂模式, 应力降, 翼裂纹, 次生裂纹, 最大径向剪应力准则

Abstract：In order to study the fracturing characteristics of the rock with a single crack，mechanical test was carried out to the rock specimen with a single pre-existing crack inclined at 45° using the MTS815.03 electrohydraulic servo controlled rock pressure testing machine. The confining pressure of 0，5，10 MPa were separately applied to the rock specimen and the effect on the crack propagation as well as the fracturing mode was analysed. A crack propagation model was established and the secondary cracking angle was obtained based on the maximum radial shearing stress criterion. The obvious precursory information occurred before the initial crack and the obvious stress drop was shown on the stress-strain curve. Wing cracks，secondary coplanar cracks and secondary anti-wing cracks were observed in tests. The initiation angle of wing cracks are about 68°–73°，the inclined anti-wing crack angles are about －119°–－125°.. The calculated theoretical crack angles are 0°，70.5° and －123.8°respectively which are consistent with the test results. The initiation stress is 90%–95% of the peak stress. The compressive strength and the confining pressure of fine sandstone have a good linear relationship of ?c = 2.69?3+61.9 with R2 = 0.97. The confining pressure affected fracturing. The fracturing modes are wing crack and anti-wing crack under no confining pressure，anti-wing crack under 5 MPa of confining pressure，anti-wing crack and secondary coplanar crack under 10 MPa of confining pressure.

Key words： rock mechanics fracturing mode stress drop wing crack secondary crack maximum shear stress of radial direction

引用本文:

刘伟韬1，申建军2. 含单裂纹真实岩石试件断裂模式的力学试验研究[J]. 岩石力学与工程学报, 2016, 35(6): 1182-1189.
LIU Weitao1，SHEN Jianjun2. Experimental study of propagation mode of crack in real rock#br# specimens with a single crack. , 2016, 35(6): 1182-1189.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2015.0710 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/I6/1182

[1]	武强. 我国矿井水防控与资源化利用的研究进展、问题和展望[J]. 煤炭学报，2014，39(5)：795-805.(WU Qiang. Progress，problems and prospects of prevention and control technology of mine water and reutilization in China[J]. Journal of China Coal Society，2014，39(5)：795-805.(in Chinese))
[2]	BRACE W F，BOMBOLAKIS E G. A note on brittle crack growth in compression[J]. Journal of Geophysical Research，1963，68(12)： 3 709-3 713. " target="_blank">
[3]	LAJTAI E Z. A theoretical and experimental evaluation of the Griffith theory of brittle fracture[J]. Tectonophysics，1971，11(2)：129-156. " target="_blank">
[4]	LAJTAI E. Z. Brittle fracture in compression[J]. International Journal of Fracture，1974，10(4)：525-536. " target="_blank">
[5]	PETIT J P，BARQUINS M. Can natural faults propagate under mode II condition[J]. Tectonics，1988，7(6)：1 243-1 256. " target="_blank">
[6]	SHEN B. The mechanics of fracture coalescence in compression experimental study and numerical simulation[J]. Engineering Fracture Mechanics，1993，51(1)：73-85. " target="_blank">
[7]	BOBET A. The initiation of secondary cracks in compression[J]. Engineering Fracture Mechanics，2000，66(2)：187-219. " target="_blank">
[8]	LI Y P，CHEN L Z，WANG Y H. Experimental research on pre-cracked marble under compression[J]. International Journal of Solids and Structures，2005，42(9/10)：2 505-2 516. " target="_blank">
[9]	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))
[10]	林鹏，黄凯珠，王仁坤，等. 不同角度单裂纹缺陷试样的裂纹扩展与破坏行为[J]. 岩石力学与工程学报，2005，24(增2)：5 652-5 657.(LIN Peng，HUANG Kaizhu，WANG Renkun，et al. Crack growth mechanism and failure behavior of specimen containing single flaw with different angles[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(Supp.2)：5 652-5 657.(in Chinese)) " target="_blank">
[11]	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，HUANG Kaizhu，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))
[12]	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)：3 251-3 256.(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)：3 251-3 256.(in Chinese)) " target="_blank">
[13]	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 Shanpo. 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)) " target="_blank">
[14]	付金伟，朱维申，曹冠华，等. 岩石中三维单裂隙扩展过程的试验研究和数值模拟[J]. 煤炭学报，2013，38(3)：411-417.(FU Jinwei，ZHU Weishen，CAO Guanhua，et al. Experimental study and numerical simulation of propagation and coalescence process of a single three-dimensional flaw in rocks[J]. Journal of China Coal Society，2013，38(3)：411-417.(in Chinese))
[15]	WONG L N Y，EINSTEIN H H. Systematic evaluation of cracking behavior in specimens containing single flaws under uniaxial compression[J]. International Journal of Rock Mechanics and Mining Sciences，2009，46(2)：239-249.
[16]	HAERI H，SHAHRIAR K，MARJI M F，et al. Cracks coalescence mechanism and cracks propagation paths in rock-like specimens containing pre-existing random cracks under compression[J]. Journal of Central South University，2014，21(6)：2 404-2 414. " target="_blank">
[17]	LEE H，JEON S. An experimental and numerical study of fracture coalescence in pre-cracked specimens under uniaxial compression[J]. International Journal of Solids and Structures，2011，48(6)：979-999.
[18]	宋彦琦，李名，王晓，等. 基于高速摄影的单预制裂纹大理岩加卸载试验[J]. 中国矿业大学学报，2014，43(5)：773-781. (SONG Yanqi，LI Ming，WANG Xiao，et al. Observation of marble with single pre-existing crack using high-speed photography under loading and unloading conditions[J]. Journal of China University of Mining and Technology，2014，43(5)：773-781.(in Chinese)) " target="_blank">
[19]	张志强，李宁，陈方方，等. 非贯通裂隙岩体破坏模式研究现状与思考[J]. 岩土力学，2009，30(增2)：143-148.(ZHANG Zhiqiang，LI Ning，CHEN Fangfang，et al. Review and status of research on failure mode of non-penetrative fractured rock mass[J]. Rock and Soil Mechanics，2009，30(Supp.2)：143-148.(in Chinese)) " target="_blank">
[20]	李贺，尹光志，许江，等. 岩石断裂力学[M]. 重庆：重庆大学出版社，1988：80-84.(LI He，YIN Guangzhi，XU Jiang，et al. Rock fracture mechanics[M]. Chongqing：Chongqing University Press，1988：80-84.(in Chinese)) " target="_blank">
[21]	孙宗颀. 如何判断在各种加载下的断裂模式：I型还是II型[J]. 三峡大学学报：自然科学版，2004，26(1)：27-30.(SUN Zongqi. How to judge fracture mode under arbitrary loading：mode I or mode II fracture[J]. Journal of China Three Gorges University：Natural Science，2004，26(1)：27-30.(in Chinese)) " target="_blank">
[22]	郭少华，孙宗颀，谢晓晴. 压缩条件下岩石断裂模式与断裂判据的研究[J]. 岩土工程学报，2002，24(3)：304-308.(GUO Shaohua，SUN Zongqi，XIE Xiaoqing. Research on mode and criterion of rock fracture under compressive loading[J]. Chinese Journal of Geotechnical Engineering，2002，24(3)：304-308.(in Chinese))
[23]	李世愚，和泰名，尹祥础，等. 岩石断裂力学导论[M]. 合肥：中国科学技术大学出版社，2010：99-114.(LI Shiyu，HE Taiming，YIN Xiangchu，et al. Introduction of rock fracture mechanics[M]. Hefei：China University of Science and Technology Press，2010：99-114.(in Chinese)) " target="_blank">