大理岩岩体力学特性的水压-应力耦合试验研究
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摘要
为研究裂隙水压力与应力条件对大理岩裂隙岩体力学特性的影响,利用MTS815 Flex Test GT岩石力学试验系统,采用特殊的试样制备和地质过程模拟方法,制备成与试验机围压系统、渗压系统融为一体的大理岩裂隙岩体试件,并对其进行了不同水压、不同围压下的水压-应力耦合三轴压缩试验。试验结果表明:大理岩岩体强度性能与变形性能均具随水压升高而减小,随围压升高而增大的特征;水压从0到4 MPa的变化过程中,强度参数f减小了20%左右,内聚力C大幅降低,变形模量E0及E50分别减小了7.7%和5.9%;围压从5 MPa到30 MPa的变化过程中,f值略有降低,C值增大了2倍多,变形模量E0及E50分别增大了58%和50%。这些成果揭示了大理岩裂隙岩体力学特性的裂隙水压效应与围压效应,对实际工程问题的研究具有重要的参考价值。
To investigate the effect of fracture water pressure and confining pressure on the mechanical properties of fractured marble rock,we produced marble rock specimens which fit with the confining pressure and osmotic pressure of testing machine system(MTS815 Flex Test GT) via special techniques and geological process simulation.We then carried out water pressure-stress field coupling triaxial tests under different water pressures and different confining pressures.Results showed that the strength and deformation properties of the rock decreased with the increase of water pressure,and increased with the rise of confining pressure.During water pressure changed from 0 to 4 MPa,the strength parameter f decreased by 20%,the cohesion C decreased remarkably,and the deformation modulus E0 and E50 decreased 7.7% and 5.9% respectively.During confining pressure changed from 5MPa to 30MPa,f decreased a little,C increased more than 2 times,E0 and E50 increased 58% and 50% respectively.These conclusions reveal the marble rock's mechanical properties under different water pressures and different confining pressures,and offer important reference to solve practical engineering problems.
To investigate the effect of fracture water pressure and confining pressure on the mechanical properties of fractured marble rock,we produced marble rock specimens which fit with the confining pressure and osmotic pressure of testing machine system(MTS815 Flex Test GT) via special techniques and geological process simulation.We then carried out water pressure-stress field coupling triaxial tests under different water pressures and different confining pressures.Results showed that the strength and deformation properties of the rock decreased with the increase of water pressure,and increased with the rise of confining pressure.During water pressure changed from 0 to 4 MPa,the strength parameter f decreased by 20%,the cohesion C decreased remarkably,and the deformation modulus E0 and E50 decreased 7.7% and 5.9% respectively.During confining pressure changed from 5MPa to 30MPa,f decreased a little,C increased more than 2 times,E0 and E50 increased 58% and 50% respectively.These conclusions reveal the marble rock's mechanical properties under different water pressures and different confining pressures,and offer important reference to solve practical engineering problems.
引文
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[11]吴建超,陈蜀俊,陈俊华.三峡水库蓄水后全位移场变化的数值模拟[J].大地测量与地球动力学,2009,29(6):52-59.(WU Jian-chao,CHEN Shu-jun,CHENJun-hua.Numerical Simulation of Total DisplacementField Change after Impoundment of Three Gorges Reser-voir[J].Journal of Geodesy and Geodynamics,2009,29(6):52-59.(in Chinese))
[12]陈蜀俊,姚运生,曾佐勋,等.三峡库首区蓄水前后构造应力场三维数值模拟研究[J].岩石力学与工程学报,2005,24(2):5611-5618.(CHEN Shu-jun,YAOYun-sheng,ZENG Zuo-xun,et al.Study on NumericalSimulation of Tectonic Stress Field Before and After Res-ervoir Impounding in the Head Area of the Three Gorges[J].Chinese Journal of Rock Mechanics and Engineer-ing,2005,24(2):5611-5618.(in Chinese))
[13]GB/T50266—99,工程岩体试验方法标准[S].北京:中国计划出版社,1999.(GB/T50266—99,Standardfor Test Method of Engineering Rock Masses[S].Bei-jing:China Planning Press,1999.(in Chinese))
[14]SL264—2001,水利水电工程岩石试验规程[S].北京:中国水利水电出版社,2001.(SL264—2001,Spec-ifications for Rock Tests in Water Conservancy and Hy-droelectric Engineering[S].Beijing:China Water PowerPress,2001.(in Chinese))
[15]徐志英.岩石力学(第三版)[M].北京:中国水利水电出版社,1993.(XU Zhi-ying.Rock Mechanics(Third E-dition)[M].Beijing:China Water Power Press,1993.(in Chinese))
[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 Deforma-tion Properties of Marble under Conventional TriaxialCompression[J].Rock and Soil Mechanics,2005,26(3):475-478.(in Chinese))
[3]张爱辉,徐进,庞希斌,等.围压对大理岩力学特性影响的试验研究[J].西南民族大学学报.自然科学版,2008,34(5):1257-1260.(ZHANG Ai-hui,XUJin,PANG Xi-bin,et al.Experimental Study of Mechan-ical Performance of Marble under Confining Pressure[J].Journal of Southwest University for Nationalities,NaturalScience Edition,2008,34(5):1257-1260.(in Chi-nese))
[4]高春玉,徐进,何鹏,等.大理岩加卸载力学特性的研究[J].岩石力学与工程学报,2005,24(3):456-460.(GAO Chun-yu,XU Jin,HE Peng,et al.Study onMechanical Properties of Marble under Loading and Un-loading Conditions[J].Chinese Journal of Rock Mechan-ics and Engineering,2005,24(3):456-460.(in Chi-nese))
[5]裴建良,刘建锋,徐进.层状大理岩卸荷力学特性试验研究[J].岩石力学与工程学报,2009,28(12):2496-2502.(PEI Jian-liang,LIU Jian-feng,XU Jin.Experi-mental Study of Mechanical Properties of Layered Marbleunder Unloading Condition[J].Chinese Journal of RockMechanics and Engineering,2009,28(12):2496-2502.(in Chinese))
[6]尹健,吉廷宏.水对岩体结构面抗剪强度弱化作用分析[J].山西建筑,2009,35(5):115-116.(YINYian,JI Ting-hong.The Analysis of the ShearingStrength’s Weakening Action of Water on the Rock’sStructure[J].Shanxi Architecture,2009,35(5):115-116.(in Chinese))
[7]阎岩,王恩至,王思敬,等.岩石渗流-流变耦合的试验研究[J].岩土力学,2010,31(7):2095-2103.(YAN Yan,WANG En-zhi,WANG Si-jing,et al.Studyof Seepage-Rheology Coupling Experiment of Rocks[J].Rock and Soil Mechanics,2010,31(7):2095-2103.(inChinese))
[8]陈瑜.水-岩作用下裂隙岩体力学性质及应力场-渗流场耦合分析[D]长沙:中南大学,2010.(CHENYu.Study on Fracture Rock Mechanical Properties underWater-Rock Interaction and Analysis on Coupling ofStress Field and Seepage Field[D].Changsha:CentralSouth University,2010.(in Chinese))
[9]刘洪磊.岩石破坏渗流机理的实验及数值模拟研究[D].辽宁:东北大学,2008.(LIU Hong-lei.Experi-mental and Numerical Study on Seepage Mechanism ofRock Failure[D].Liaoning:Northeast University,2008.(in Chinese))
[10]曹建玲,石耀霖.河道型水库蓄水诱发地震的数值模拟[J].中国科学院研究生院学报,2011,28(1):19-26.(CAO Jian-ling,SHI Yao-lin.Numerical Study onChannel Reservoir Induced Earthquake[J].Journal ofGraduate School of the Chinese Academy of Sciences,2011,28(1):19-26.(in Chinese))
[11]吴建超,陈蜀俊,陈俊华.三峡水库蓄水后全位移场变化的数值模拟[J].大地测量与地球动力学,2009,29(6):52-59.(WU Jian-chao,CHEN Shu-jun,CHENJun-hua.Numerical Simulation of Total DisplacementField Change after Impoundment of Three Gorges Reser-voir[J].Journal of Geodesy and Geodynamics,2009,29(6):52-59.(in Chinese))
[12]陈蜀俊,姚运生,曾佐勋,等.三峡库首区蓄水前后构造应力场三维数值模拟研究[J].岩石力学与工程学报,2005,24(2):5611-5618.(CHEN Shu-jun,YAOYun-sheng,ZENG Zuo-xun,et al.Study on NumericalSimulation of Tectonic Stress Field Before and After Res-ervoir Impounding in the Head Area of the Three Gorges[J].Chinese Journal of Rock Mechanics and Engineer-ing,2005,24(2):5611-5618.(in Chinese))
[13]GB/T50266—99,工程岩体试验方法标准[S].北京:中国计划出版社,1999.(GB/T50266—99,Standardfor Test Method of Engineering Rock Masses[S].Bei-jing:China Planning Press,1999.(in Chinese))
[14]SL264—2001,水利水电工程岩石试验规程[S].北京:中国水利水电出版社,2001.(SL264—2001,Spec-ifications for Rock Tests in Water Conservancy and Hy-droelectric Engineering[S].Beijing:China Water PowerPress,2001.(in Chinese))
[15]徐志英.岩石力学(第三版)[M].北京:中国水利水电出版社,1993.(XU Zhi-ying.Rock Mechanics(Third E-dition)[M].Beijing:China Water Power Press,1993.(in Chinese))
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