含缺陷砂岩裂纹扩展特征试验与模拟研究
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摘要
采用岩石力学伺服控制试验机和声发射仪,对含缺陷砂岩进行了单轴压缩试验,研究了岩石的裂纹扩展和声发射特征。同时采用岩石破裂过程分析系统进行了模拟研究,试验结果和模拟结果具有较好的一致性。在此基础上进行了多次重复模拟试验,探讨了材料非均质性对岩石裂纹扩展特征的影响。实验结果表明:岩石材料裂纹扩展特征与材料非均质性密切相关,主裂纹首先在裂隙尖端产生并沿垂直裂隙方向扩展,而后改沿最大主应力方向朝端部扩展,但此后的裂纹扩展方向不同,且主裂纹在各阶段扩展长度、速度不同;同时,次生裂纹参数(数量、长度、宽度、走向)存在差异。
In this paper,to research the crack propagation and AE behavior of rock mass,an uniaxial compression text was conducted on the sandstone samples by using the servo-controlled testing machine and AE monitoring system.Meanwhile,a numerical simulation was carried out with the rock failure process analysis system,while the numerial results displayed a good consistency with the experimental results.On this basis,the influences of material heterogeneity on crack propagation were further studied by using multiple repeated simulation.The results show that the crack propagation of sandstone is greatly related to the heterogeneity of rock material.The main crack of the sandstone sample initiates from the end of pre-exiting crack firstly,and expands along the perpendicular of pre-exiting crack.Then the development of crack turned towards the loading direction,whereas,lately,the cracks on the samples grow in different directions whilst the length and speed of crack propagation are various at different stages.Moreover,the secondary crack parameters including secondary crack number,length,width and expanding direction are different.
In this paper,to research the crack propagation and AE behavior of rock mass,an uniaxial compression text was conducted on the sandstone samples by using the servo-controlled testing machine and AE monitoring system.Meanwhile,a numerical simulation was carried out with the rock failure process analysis system,while the numerial results displayed a good consistency with the experimental results.On this basis,the influences of material heterogeneity on crack propagation were further studied by using multiple repeated simulation.The results show that the crack propagation of sandstone is greatly related to the heterogeneity of rock material.The main crack of the sandstone sample initiates from the end of pre-exiting crack firstly,and expands along the perpendicular of pre-exiting crack.Then the development of crack turned towards the loading direction,whereas,lately,the cracks on the samples grow in different directions whilst the length and speed of crack propagation are various at different stages.Moreover,the secondary crack parameters including secondary crack number,length,width and expanding direction are different.
引文
[1]陈卫忠,李术才,朱维申,等.岩石裂纹扩展的实验与数值研究[J].岩石力学与工程学报,2003,22(1):18-23.CHEN Wei-zhong,LI Shu-cai,ZHU Wei-shen,et al.Experimental and numerical research on crack propaga-tion in rock under compression[J].Chinese Journal ofRock Mechanics and Engineering,2003,22(1):18-23.
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[6]李地元,李夕兵,李春林,等.单轴压缩下含预制孔洞板状花岗岩试样力学响应的试验和数值研究[J].岩石力学与工程学报,2011,30(6):1198-1206.LI Di-yuan,LI Xi-bing,LI Chun-lin,et al.Experimentaland numerical studies of mechanical response of plate-shape granite samples containing prefabricated holes un-der uniaxial compression[J].Chinese Journal of RockMechanics and Engineering,2011,30(6):1198-1206.
[7]刘顺桂,刘海宁,王思敬,等.断续节理直剪试验与PFC2D数值模拟分析[J].岩石力学与工程学报,2008,27(9):1828-1836.LIU Shun-gui,LIU Hai-ning,WANG Si-jing,et al.Directshear tests and PFC2D numerical simulation of intermit-tent joints[J].Chinese Journal of Rock Mechanics andEngineering,2008,27(9):1828-1836.
[8]王元汉,苗语,李银平.预制裂纹岩石压剪试验的数值模拟分析[J].岩石力学与工程学报,2004,23(18):3113-3116.WANG Yuan-han,MIAO Yu,LI Yin-ping.Numericalsimulation of the experiment on rock with preexistedcracks under compression and shearing[J].ChineseJournal of Rock Mechanics and Engineering,2004,23(18):3113-3116.
[9]焦明若,张国民,唐春安,等.含预制软弱带的岩石破裂过程的数值模拟[J].地震学报,2002,24(1):35-41.JIAO Ming-ruo,ZHANG Guo-min,TANG Chun-an,et al.Numerical smulation of rock progressive failure onsamples with pre-existed weak zone during brittlefailure[J].Acta Seismologica Sinica,2002,24(1):35-41.
[10]朱万成,黄志平,唐春安,等.含预制纹巴西盘试样破裂模式的数值模拟[J].岩土力学,2008,25(10):1609-1612.ZHU Wan-cheng,HUANG Zhi-ping,TANG Chun-an,et al.Numerical simulation on failure process ofpre-cracked brazilian disk specimen of rock[J].Rock andSoil Mechanics,2008,25(10):1609-1612.
[11]唐春安.岩石声发射规律数值模拟初探[J].岩石力学与工程学报,1997,16(4):368-378.TANG Chun-an.Numerical simulation of AE in rockfailure[J].Chinese Journal of Rock Mechanics and En-gineering,1997,16(4):368-378.
[12]TANG Chun-an.Numerical simulation of rock failureand associated seismicity[J].Int J Rock Mech Min Sci,1997,34(2):249-262.
[13]崔维成.复合材料结构破坏过程的计算机模拟[J].复合材料学报,1996,13(4):102-111.CUI Wei-cheng.Computational simulation of progres-sive failure in composite structure[J].Acta MateriaeCompositae Sinica,1996,13(4):102-111.
[2]王国艳,李树忱,杨磊.单裂隙岩石损伤断裂过程的试验研究[J].辽宁工程技术大学学报,2009,28(4):581-584.WANG Guo-yan,LI Shu-chen,YANG Lei.Investigationon the damage-fractured process of single fracturedrock[J].Journal of Liaoning Technical University,2009,28(4):581-584.
[3]杨圣奇,戴永浩,韩立军,等.断续预制裂隙脆性大理岩变形破坏特性单轴压缩试验研究[J].岩石力学与工程学报,2009,28(12):2391-2404.YANG Sheng-qi,DAI Yong-hao,HAN Li-jun,et al.Uniaxial compression experimental research on deforma-tion and failure properties of brittle marble specimen withpre-existing fissures[J].Chinese Journal of Rock Me-chanics and Engineering,2009,28(12):2391-2404.
[4]杨圣奇,吕朝辉,渠涛.含单个孔洞大理岩裂纹扩展细观试验和模拟[J].中国矿业大学学报,2008,38(6):774-781.YANG Sheng-qi,LV Chao-hui,QU Tao.Investigationsof crack expansion in marble having a single pre-existinghole:experiment and simulations[J].Journal of ChinaUniversity of Mining&Technology,2008,38(6):774-781.
[5]李廷春,吕海波.三轴压缩载荷作用下单裂隙扩展的CT实时扫描试验[J].岩石力学与工程学报,2010,29(2):290-296.LI Ting-chun,LV hai-bo.CT real-time scanning tests onsingle crack propagation under triaxial compression[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(2):290-296.
[6]李地元,李夕兵,李春林,等.单轴压缩下含预制孔洞板状花岗岩试样力学响应的试验和数值研究[J].岩石力学与工程学报,2011,30(6):1198-1206.LI Di-yuan,LI Xi-bing,LI Chun-lin,et al.Experimentaland numerical studies of mechanical response of plate-shape granite samples containing prefabricated holes un-der uniaxial compression[J].Chinese Journal of RockMechanics and Engineering,2011,30(6):1198-1206.
[7]刘顺桂,刘海宁,王思敬,等.断续节理直剪试验与PFC2D数值模拟分析[J].岩石力学与工程学报,2008,27(9):1828-1836.LIU Shun-gui,LIU Hai-ning,WANG Si-jing,et al.Directshear tests and PFC2D numerical simulation of intermit-tent joints[J].Chinese Journal of Rock Mechanics andEngineering,2008,27(9):1828-1836.
[8]王元汉,苗语,李银平.预制裂纹岩石压剪试验的数值模拟分析[J].岩石力学与工程学报,2004,23(18):3113-3116.WANG Yuan-han,MIAO Yu,LI Yin-ping.Numericalsimulation of the experiment on rock with preexistedcracks under compression and shearing[J].ChineseJournal of Rock Mechanics and Engineering,2004,23(18):3113-3116.
[9]焦明若,张国民,唐春安,等.含预制软弱带的岩石破裂过程的数值模拟[J].地震学报,2002,24(1):35-41.JIAO Ming-ruo,ZHANG Guo-min,TANG Chun-an,et al.Numerical smulation of rock progressive failure onsamples with pre-existed weak zone during brittlefailure[J].Acta Seismologica Sinica,2002,24(1):35-41.
[10]朱万成,黄志平,唐春安,等.含预制纹巴西盘试样破裂模式的数值模拟[J].岩土力学,2008,25(10):1609-1612.ZHU Wan-cheng,HUANG Zhi-ping,TANG Chun-an,et al.Numerical simulation on failure process ofpre-cracked brazilian disk specimen of rock[J].Rock andSoil Mechanics,2008,25(10):1609-1612.
[11]唐春安.岩石声发射规律数值模拟初探[J].岩石力学与工程学报,1997,16(4):368-378.TANG Chun-an.Numerical simulation of AE in rockfailure[J].Chinese Journal of Rock Mechanics and En-gineering,1997,16(4):368-378.
[12]TANG Chun-an.Numerical simulation of rock failureand associated seismicity[J].Int J Rock Mech Min Sci,1997,34(2):249-262.
[13]崔维成.复合材料结构破坏过程的计算机模拟[J].复合材料学报,1996,13(4):102-111.CUI Wei-cheng.Computational simulation of progres-sive failure in composite structure[J].Acta MateriaeCompositae Sinica,1996,13(4):102-111.
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