不同围压下断续预制裂隙大理岩扩容特性试验研究
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摘要
基于在伺服试验机上获得的不同围压下断续预制裂隙大理岩体积应变-轴向应变全程曲线,分析了围压对断续预制裂隙大理岩扩容特性的影响规律。结果表明,完整和断续预制裂隙大理岩裂纹损伤阈值随着围压的增加均近似呈线性增大,而且裂纹损伤阈值对围压的敏感性低于峰值强度;同等围压下,粒径较小的中晶大理岩具有较高的裂纹损伤阈值;完整或断续预制裂隙大理岩的长期内摩擦角均显著低于瞬时内摩擦角值,但长期黏聚力的降低幅度与裂隙分布密切相关;完整或断续预制裂隙大理岩的峰值强度越高,相应的裂纹损伤阈值也越大,且两者之间具有较好的线性关系。研究结论对于岩石工程设计和数值分析时断续节理裂隙岩体力学参数选取具有一定的参考价值。
Based on the obtained volumetric-axial strain curves of marble with pre-existing fissures under different confining pressures,the effect of confining pressures on dilatancy behavior of marble with pre-existing fissures is analyzed.The results show that the crack damage thresholds of intact and pre-cracked marble all increase linearly with the confining pressures,and that the sensibility of the crack damage thresholds to the confining pressures is lower than that to the peak strength.Under the same confining pressure,the medium marble with smaller grain sizes has higher crack damage threshold.The long-term internal friction angles of intact and pre-cracked marble are lower distinctly than the short-term,but the reducing extent of long-term cohesion is closely related to fissure geometry.The higher the peak strength of intact or pre-cracked marble,the larger the corresponding crack damage thresholds.The peak strength of intact and pre-cracked marble has a good linear relation with the crack damage thresholds.The conclusions are significant for the choice of mechanical parameters of rock mass with jointed fissures when carrying out engineering design and numerical simulation.
Based on the obtained volumetric-axial strain curves of marble with pre-existing fissures under different confining pressures,the effect of confining pressures on dilatancy behavior of marble with pre-existing fissures is analyzed.The results show that the crack damage thresholds of intact and pre-cracked marble all increase linearly with the confining pressures,and that the sensibility of the crack damage thresholds to the confining pressures is lower than that to the peak strength.Under the same confining pressure,the medium marble with smaller grain sizes has higher crack damage threshold.The long-term internal friction angles of intact and pre-cracked marble are lower distinctly than the short-term,but the reducing extent of long-term cohesion is closely related to fissure geometry.The higher the peak strength of intact or pre-cracked marble,the larger the corresponding crack damage thresholds.The peak strength of intact and pre-cracked marble has a good linear relation with the crack damage thresholds.The conclusions are significant for the choice of mechanical parameters of rock mass with jointed fissures when carrying out engineering design and numerical simulation.
引文
[1]杨圣奇.裂隙岩石力学特性研究及时间效应分析[M].北京:科学出版社,2011.(YANG Sheng-qi.Study on themechanical behavior of fissured rock and time-dependenteffect analysis[J].Beijing:Sciences Press,2011.(inChinese))
[2]杨圣奇,苏承东,徐卫亚.大理岩常规三轴压缩下强度和变形特性的试验研究[J].岩土力学,2005,26(3):475-478.(YANG Sheng-qi,SU Cheng-dong,XU Wei-ya.Experimental investigation on strength and deformationproperties of marble under conventional triaxialcompression[J].Rock and Soil Mechanics,2005,26(3):475-478.(in Chinese))
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[4]徐松林,吴文,李廷,等.三轴压缩大理岩局部化变形的试验研究及其分岔行为[J].岩土工程学报,2001,23(3):296-301.(XU Song-lin,WU Wen,LI Ting,et al.Experimental studies on localization and bifurcationbehaviors of a marble under triaxial compression[J].ChineseJournal of Geotechnical Engineering,2001,23(3):296-301.(in Chinese))
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[7]YANG S Q,JIANG Y Z,XU W Y,et al.Experimentalinvestigation on strength and failure behavior of pre-crackedmarble under conventional triaxial compression[J].International Journal of Solids and Structures,2008,45(17):4796-4819.
[8]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 experimentalresearch on deformation and failure properties of brittlemarble specimen with pre-existing fissures[J].ChineseJournal of Rock Mechanics and Mining Sciences,2009,28(12):2391-2404.(in Chinese))
[9]杨圣奇,渠涛,韩立军,等.注浆锚固裂隙砂岩破裂模式和裂纹扩展特征[J].工程力学,2010,27(12):156-163.(YANG Sheng-qi,QU Tao,HAN Li-jun,et al.Failure modeand crack propagation of sandstone with pre-existing fissuresunder different anchorages by grouting[J].EngineeringMechanics,2010,27(12):156-163.(in Chinese))
[10]卢兴利,刘泉声,张伟,等.高应力软岩非弹性体积增加试验研究[J].煤炭学报,2009,34(7):903-906.(LUXing-li,LIU Quan-sheng,ZHANG Wei,et al.Test study ofinelastic volume increase of soft rock in high stress[J].Journal of China Coal Society,2009,34(7):903-906.(inChinese))
[11]陈宗基,石泽全,于智海,等.用8000kN多功能三轴仪测量脆性岩石的扩容、蠕变及松弛[J].岩石力学与工程学报,1989,8(2):97-118.(TAN Tjong-kie,SHI Zhe-quan,YUZhi-hai,et al.Dilatancy creep and relaxation of brittle rocksmeasured with the 8000 kN multipurpose triaxial apparatus[J].Chinese Journal of Rock Mechanics and Engineering,1989,8(2):97-118.)
[12]陈宗基,康文法.在岩石破坏和地震之前与时间有关的扩容[J].岩石力学与工程学报,1983,2(1):11-21.(TANTjong-kie,KANG Wen-fa.Time dependent dilatancy prior torock failure and earthquakes[J].Chinese Journal of RockMechanics and Engineering,1983,2(1):11-21.(inChinese))
[13]康文法.湿度、围压、空隙水压力和时间对房山砂岩扩容、强度的效应[J].岩石力学与工程学报,1990,9(3):184-194.(KANG Wen-fa.The effects of humidity,confining pressure,pore-water pressure and time on the dilatancy and strength ofFangshan sandstones[J].Chinese Journal of Rock Mechanicsand Engineering,1990,9(3):184-194.(in Chinese))
[14]ALEJANO L R,ALONSO E.Considerations of the dilatancyangle in rocks and rock masses[J].International Journal ofRock Mechanics and Mining Sciences,2005,42(4):481-507.
[15]YUAN Shih-che,HARRISON J P.An empirical dilatancyindex for the dilatant deformation of rock[J].InternationalJournal of Rock Mechanics and Mining Sciences,2004,41(4):679-686.
[16]FAIRHURST C E,HUDSON J A.Draft ISRM suggestedmethod for the complete stress-strain curve for the intactrock in uniaxial compression[J].International Journal ofRock Mechanics and Mining Sciences,1999,36(3):279-289.
[17]BOBET A,EINSTEIN H H.Fracture coalescence inrock-type materials under uniaxial and biaxial compression[J].International Journal of Rock Mechanics and MiningSciences,1998,35(7):863-888.
[18]MARTIN D,CHANDLER N A.The progressive fracture ofLac du Bonnet Granite[J].International Journal of RockMechanics and Mining Sciences&Geomechanical Abstracts,1994,31(6):643-659.
[19]EBERHARD E,STEAD D,STIMPSON B.Quantifyingprogressive pre-peak brittle fracture damage in rock duringuniaxial compression[J].International Journal of RockMechanics and Mining Sciences,1999,36(3):361-380.
[20]ALKAN H,CINAR Y,PUSCH G.Rock salt dilatancyboundary from combined acoustic emission and triaxialcompression tests[J].International Journal of RockMechanics and Mining Sciences,2007,44(1):108-119.
[2]杨圣奇,苏承东,徐卫亚.大理岩常规三轴压缩下强度和变形特性的试验研究[J].岩土力学,2005,26(3):475-478.(YANG Sheng-qi,SU Cheng-dong,XU Wei-ya.Experimental investigation on strength and deformationproperties of marble under conventional triaxialcompression[J].Rock and Soil Mechanics,2005,26(3):475-478.(in Chinese))
[3]杨圣奇,徐卫亚,苏承东.大理岩三轴压缩变形破坏与能量特征研究[J].工程力学,2007,24(1):136-142.(YANGSheng-qi,XU Wei-ya,SU Cheng-dong.Study on thedeformation failure and energy properties of marble specimenunder triaxial compression[J].Engineering Mechanics,2007,24(1):136-142.(in Chinese))
[4]徐松林,吴文,李廷,等.三轴压缩大理岩局部化变形的试验研究及其分岔行为[J].岩土工程学报,2001,23(3):296-301.(XU Song-lin,WU Wen,LI Ting,et al.Experimental studies on localization and bifurcationbehaviors of a marble under triaxial compression[J].ChineseJournal of Geotechnical Engineering,2001,23(3):296-301.(in Chinese))
[5]徐松林,吴文,张奇华,等.大理岩有限变形分岔分析[J].岩土工程学报,2002,24(1):42-46.(XU Song-lin,WU Wen,ZHANG Qi-hua,et al.Bifurcation analyses of finite/largedeformation for a marble[J].Chinese Journal of GeotechnicalEngineering,2002,24(1):42-46.(in Chinese))
[6]杨圣奇,徐卫亚,谢守益,等.饱和状态下硬岩三轴流变变形与破裂机制研究[J].岩土工程学报,2006,28(8):962-969.(YANG Sheng-qi,XU Wei-ya,XIE Shou-yi,et al.Studies on triaxial rheological deformation and failuremechanism of hard rock in saturated state[J].Chinese Journalof Geotechnical Engineering,2006,28(8):962-969.(inChinese))
[7]YANG S Q,JIANG Y Z,XU W Y,et al.Experimentalinvestigation on strength and failure behavior of pre-crackedmarble under conventional triaxial compression[J].International Journal of Solids and Structures,2008,45(17):4796-4819.
[8]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 experimentalresearch on deformation and failure properties of brittlemarble specimen with pre-existing fissures[J].ChineseJournal of Rock Mechanics and Mining Sciences,2009,28(12):2391-2404.(in Chinese))
[9]杨圣奇,渠涛,韩立军,等.注浆锚固裂隙砂岩破裂模式和裂纹扩展特征[J].工程力学,2010,27(12):156-163.(YANG Sheng-qi,QU Tao,HAN Li-jun,et al.Failure modeand crack propagation of sandstone with pre-existing fissuresunder different anchorages by grouting[J].EngineeringMechanics,2010,27(12):156-163.(in Chinese))
[10]卢兴利,刘泉声,张伟,等.高应力软岩非弹性体积增加试验研究[J].煤炭学报,2009,34(7):903-906.(LUXing-li,LIU Quan-sheng,ZHANG Wei,et al.Test study ofinelastic volume increase of soft rock in high stress[J].Journal of China Coal Society,2009,34(7):903-906.(inChinese))
[11]陈宗基,石泽全,于智海,等.用8000kN多功能三轴仪测量脆性岩石的扩容、蠕变及松弛[J].岩石力学与工程学报,1989,8(2):97-118.(TAN Tjong-kie,SHI Zhe-quan,YUZhi-hai,et al.Dilatancy creep and relaxation of brittle rocksmeasured with the 8000 kN multipurpose triaxial apparatus[J].Chinese Journal of Rock Mechanics and Engineering,1989,8(2):97-118.)
[12]陈宗基,康文法.在岩石破坏和地震之前与时间有关的扩容[J].岩石力学与工程学报,1983,2(1):11-21.(TANTjong-kie,KANG Wen-fa.Time dependent dilatancy prior torock failure and earthquakes[J].Chinese Journal of RockMechanics and Engineering,1983,2(1):11-21.(inChinese))
[13]康文法.湿度、围压、空隙水压力和时间对房山砂岩扩容、强度的效应[J].岩石力学与工程学报,1990,9(3):184-194.(KANG Wen-fa.The effects of humidity,confining pressure,pore-water pressure and time on the dilatancy and strength ofFangshan sandstones[J].Chinese Journal of Rock Mechanicsand Engineering,1990,9(3):184-194.(in Chinese))
[14]ALEJANO L R,ALONSO E.Considerations of the dilatancyangle in rocks and rock masses[J].International Journal ofRock Mechanics and Mining Sciences,2005,42(4):481-507.
[15]YUAN Shih-che,HARRISON J P.An empirical dilatancyindex for the dilatant deformation of rock[J].InternationalJournal of Rock Mechanics and Mining Sciences,2004,41(4):679-686.
[16]FAIRHURST C E,HUDSON J A.Draft ISRM suggestedmethod for the complete stress-strain curve for the intactrock in uniaxial compression[J].International Journal ofRock Mechanics and Mining Sciences,1999,36(3):279-289.
[17]BOBET A,EINSTEIN H H.Fracture coalescence inrock-type materials under uniaxial and biaxial compression[J].International Journal of Rock Mechanics and MiningSciences,1998,35(7):863-888.
[18]MARTIN D,CHANDLER N A.The progressive fracture ofLac du Bonnet Granite[J].International Journal of RockMechanics and Mining Sciences&Geomechanical Abstracts,1994,31(6):643-659.
[19]EBERHARD E,STEAD D,STIMPSON B.Quantifyingprogressive pre-peak brittle fracture damage in rock duringuniaxial compression[J].International Journal of RockMechanics and Mining Sciences,1999,36(3):361-380.
[20]ALKAN H,CINAR Y,PUSCH G.Rock salt dilatancyboundary from combined acoustic emission and triaxialcompression tests[J].International Journal of RockMechanics and Mining Sciences,2007,44(1):108-119.
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