非贯通非共面凝灰岩节理岩体各向异性及其能量特征分析
|
摘要
通过预制平行非贯穿节理试件进行单轴压缩试验,系统研究在节理倾角和节理间距组合形式下,对岩石试件的应力-应变曲线、峰值强度、变形参数、能量特征等的影响。试验研究发现:(1)平行节理岩体强度和变形曲线随节理倾角都呈现U型,当节理倾角为60°时,岩石单轴抗压强度取得最小值,表现出强烈的各向异性,随着节理间距的增大,岩石的单轴抗压强度逐渐增大;(2)试件破坏模式主要与节理倾角有关,在倾角为30°、45°时为张拉破坏或者张剪破坏特征,在倾角为60°时表现出剪切破坏特征,倾角为75°时为张剪破坏;(3)岩石在变形各阶段中吸收能量与耗散能成非线性增长,弹性应变能呈现先增加后减小,能量曲线随节理间距成指数增加关系。
The uniaxial compression test is performed on samples with prefabricated parallel non-penetrating joints.The influence of joint angle combined with the joint spacing on the stress strain curves,peak strength,deformation parameters and energy characteristics of rock specimens are systematically studied.The results indicate that:(1) the strength and deformation curves rock mass with parallel joints are U-shaped.When the joint dip is 60 degrees,the uniaxial compressive strength is minimum,and the anisotropy characteristic is obvious.With the increase of joint spacing,the uniaxial compressive strength gradually increases.(2) The failure mode of the specimen is mainly related to the inclination angle of the joint.Specimen damage appears tensile failure or tensile-shear failure while the joint inclination angle is 30° and 45°,it appears shear failure while the joint inclination angle is 60°,and the tensile-shear failure is predominant wihle the joint inclination angle is 75°.(3) both the absorption energy and the dissipative energy of rock mass at different stages of deformation increase nonlinearly.Elastic strain energy firstly increases and then decreases,and the energy curve grows exponentially with the joint spacing.
The uniaxial compression test is performed on samples with prefabricated parallel non-penetrating joints.The influence of joint angle combined with the joint spacing on the stress strain curves,peak strength,deformation parameters and energy characteristics of rock specimens are systematically studied.The results indicate that:(1) the strength and deformation curves rock mass with parallel joints are U-shaped.When the joint dip is 60 degrees,the uniaxial compressive strength is minimum,and the anisotropy characteristic is obvious.With the increase of joint spacing,the uniaxial compressive strength gradually increases.(2) The failure mode of the specimen is mainly related to the inclination angle of the joint.Specimen damage appears tensile failure or tensile-shear failure while the joint inclination angle is 30° and 45°,it appears shear failure while the joint inclination angle is 60°,and the tensile-shear failure is predominant wihle the joint inclination angle is 75°.(3) both the absorption energy and the dissipative energy of rock mass at different stages of deformation increase nonlinearly.Elastic strain energy firstly increases and then decreases,and the energy curve grows exponentially with the joint spacing.
引文
[1]李淼,乔兰,李庆文.高应变率下预制单节理岩石SHPB劈裂试验能量耗散分析[J].岩土工程学报,2017,39(7):1336-1343.LI Miao,QIAO Lan,LI Qingwen. Energy dissipationof rock specimens under high strain rate with singlejoint in SHPB tensile tests[J]. Chinese Journal ofGeotechnical Engineering,2017,39(7):1336-1343.
[2] PARK C H,Bobe A. Crack coalescence in specimenswith open and closed flaws:A comparison[J].International Journalof Rock Mechanics and MiningSciences,2009(5).
[3]杨阳,杨仁树,王建国.节理厚度对岩石动力特性影响的模拟试验[J].中国矿业大学学报,2016,45(2):211-216+309.YANG Yang, YANG Renshu, WANG Jianguo.Simulation material experiment ondynamic mechanicalproperties of jointed rock affected by joint thickness[J]. Journal of China University of Mining andTechnology,2016,45(2):211-216+309.
[4]肖维民,邓荣贵,邹祖银.柱状节理岩体各向异性强度准则研究[J].岩石力学与工程学报,2015,34(11):2205-2214XIAO Weimin, DENG Ronggui, ZOU Zuyin.Anisotropic strength criterion for columnar jointed rockmasses[J]. Chinese Journal of GeotechnicalEngineering,2015,34(11):2205-2214.
[5]周喻,张怀静,吴顺川,等.节理连通率对岩体力学特性影响的细观研究[J].岩土力学,2015,36(S2):29-36.ZHOU Yu,ZHANG Huaijing,WU Shunchuan,et al.Meso-research on mechanical properties of rock massaffected by joint connectivity rate[J]. Rock and SoilMechanics,2015,36(S2):29-36.
[6] KULATILAKE P H S W,HE W,UM J,et al. Aphysical model study of jointed rock mass strengthunder uniaxial compressive loading[J]. InternationalJournal of Rock Mechanics and Mining Sciences,1997,34(3/4):165. e1-165. e15.
[7] SINGH M,RAOKS,RAMAMURTHY T. Strength anddeformational behaviour of a jointed rock mass[J].Rock Mechanics and Rock Engineering,2002,35(1):45-64.
[8]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):1572-1587.YANG Shengqi, WEN Sen, LI Liangquan.Experimental study on deformation and strengthproperties of coarse marble with discontinous pre-existing cracks under different confining pressures[J]. Chinese Journal of Rock Mechanics andEngineering,2007,26(8):1572-1587.
[9]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,etal. Study on fracture pattern of open surface-flaw ingabbro[J]. Chinese Journal of Rock Mechanics andEngineering,2007,26(3):525-531.
[10]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 preexisting cracks in marbleunder compression[J]. Chinese Journal ofGeotechnical Engineering,2004,26(1):120-124.
[11]李树忱,汪雷,李术才,等.不同倾角贯穿节理类岩石试件峰后变形破坏试验研究[J].岩石力学与工程学报,2013,32(S2):3391-3395.LI Shuchen,WANG Lei,LI Shucai,et al. Post-peakdeformation and failure experimental study of rock-likespecimens with different inclination angles persistentjoints[J]. Chinese Journal of Rock Mechanics andEngineering,2013,32(S2):3391-3395.
[12]谢和平,鞠杨,黎立云.基于能量耗散与释放原理的岩石强度与整体破坏准则[J].岩石力学与工程学报,2005,24(17):3003-3010XIE Heping,JU Yang,LI Liyun. Rock strength andglobal failure criterion based on the principle of energydissipation and release[J]. Chinese Journal of RockMechanics and Engineering,2005,24(17):3003-3010.
[2] PARK C H,Bobe A. Crack coalescence in specimenswith open and closed flaws:A comparison[J].International Journalof Rock Mechanics and MiningSciences,2009(5).
[3]杨阳,杨仁树,王建国.节理厚度对岩石动力特性影响的模拟试验[J].中国矿业大学学报,2016,45(2):211-216+309.YANG Yang, YANG Renshu, WANG Jianguo.Simulation material experiment ondynamic mechanicalproperties of jointed rock affected by joint thickness[J]. Journal of China University of Mining andTechnology,2016,45(2):211-216+309.
[4]肖维民,邓荣贵,邹祖银.柱状节理岩体各向异性强度准则研究[J].岩石力学与工程学报,2015,34(11):2205-2214XIAO Weimin, DENG Ronggui, ZOU Zuyin.Anisotropic strength criterion for columnar jointed rockmasses[J]. Chinese Journal of GeotechnicalEngineering,2015,34(11):2205-2214.
[5]周喻,张怀静,吴顺川,等.节理连通率对岩体力学特性影响的细观研究[J].岩土力学,2015,36(S2):29-36.ZHOU Yu,ZHANG Huaijing,WU Shunchuan,et al.Meso-research on mechanical properties of rock massaffected by joint connectivity rate[J]. Rock and SoilMechanics,2015,36(S2):29-36.
[6] KULATILAKE P H S W,HE W,UM J,et al. Aphysical model study of jointed rock mass strengthunder uniaxial compressive loading[J]. InternationalJournal of Rock Mechanics and Mining Sciences,1997,34(3/4):165. e1-165. e15.
[7] SINGH M,RAOKS,RAMAMURTHY T. Strength anddeformational behaviour of a jointed rock mass[J].Rock Mechanics and Rock Engineering,2002,35(1):45-64.
[8]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):1572-1587.YANG Shengqi, WEN Sen, LI Liangquan.Experimental study on deformation and strengthproperties of coarse marble with discontinous pre-existing cracks under different confining pressures[J]. Chinese Journal of Rock Mechanics andEngineering,2007,26(8):1572-1587.
[9]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,etal. Study on fracture pattern of open surface-flaw ingabbro[J]. Chinese Journal of Rock Mechanics andEngineering,2007,26(3):525-531.
[10]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 preexisting cracks in marbleunder compression[J]. Chinese Journal ofGeotechnical Engineering,2004,26(1):120-124.
[11]李树忱,汪雷,李术才,等.不同倾角贯穿节理类岩石试件峰后变形破坏试验研究[J].岩石力学与工程学报,2013,32(S2):3391-3395.LI Shuchen,WANG Lei,LI Shucai,et al. Post-peakdeformation and failure experimental study of rock-likespecimens with different inclination angles persistentjoints[J]. Chinese Journal of Rock Mechanics andEngineering,2013,32(S2):3391-3395.
[12]谢和平,鞠杨,黎立云.基于能量耗散与释放原理的岩石强度与整体破坏准则[J].岩石力学与工程学报,2005,24(17):3003-3010XIE Heping,JU Yang,LI Liyun. Rock strength andglobal failure criterion based on the principle of energydissipation and release[J]. Chinese Journal of RockMechanics and Engineering,2005,24(17):3003-3010.