三轴压缩条件下单裂隙岩石的破坏特性研究
|
摘要
通过在高强硅粉砂浆材料模型中预制特定倾角和特定尺寸的单裂隙,以常规三轴压缩试验为手段,研究单裂隙试样的破坏特性。试验中观察到3类典型的裂纹,即拉伸型裂纹(Ⅰ型)、滑移型裂纹(Ⅱ型)和撕开型裂纹(Ⅲ型),其中Ⅱ型、Ⅲ型裂纹在三维试验中普遍存在,Ⅰ型裂纹仅在部分试件中观察到;三轴压缩条件下试样的破裂模式有3种,即拉剪复合破坏、"X"型的剪切破坏和沿裂隙面的剪切破坏。试验结果表明:三轴压缩条件下的单裂隙试样的裂隙扩展规律与预制裂隙关系密切,围压是试样宏观破裂模式的主要影响因素,预制裂隙长度主要影响裂隙扩展的规模,预制裂隙倾角则是新裂隙起裂的诱因。
A series of high-strength silicon powder mortar material model specimens with single joint which containing the specific size and the particular inclination are made in the laboratory,the failure modes and characteristics of the single jointed specimens are researched by means of the conventional triaxial compression test.Three typical cracks are observed during the test;they are stretching mode crack(Ⅰ),sliding mode crack(Ⅱ),tearing mode crack(Ⅲ).Ⅱ,Ⅲ cracks are ubiquitous and Ⅰcrack is only local existing.The main failure modes are X-shaped shear failure;and the pure shear failure mode is found under specific conditions.The results show that: the expanding regularity of fault cracks has close ties with the preexisting fissures;the confining pressure is the main influencing factors that the failure modes of the single jointed specimens under the conventional triaxial compression test;the preexisting length mainly affect the size of the fracture extension and joint inclination is the cause of the crack initiation.
A series of high-strength silicon powder mortar material model specimens with single joint which containing the specific size and the particular inclination are made in the laboratory,the failure modes and characteristics of the single jointed specimens are researched by means of the conventional triaxial compression test.Three typical cracks are observed during the test;they are stretching mode crack(Ⅰ),sliding mode crack(Ⅱ),tearing mode crack(Ⅲ).Ⅱ,Ⅲ cracks are ubiquitous and Ⅰcrack is only local existing.The main failure modes are X-shaped shear failure;and the pure shear failure mode is found under specific conditions.The results show that: the expanding regularity of fault cracks has close ties with the preexisting fissures;the confining pressure is the main influencing factors that the failure modes of the single jointed specimens under the conventional triaxial compression test;the preexisting length mainly affect the size of the fracture extension and joint inclination is the cause of the crack initiation.
引文
[1]李世愚,钟放庆.三维破裂研究进展综述[J].国际地震动态,1993,2(1):1-4.LI Shi-yu,ZHONG Fang-qing.Overview ofdevelopments in three-dimensional fracture research[J].Recent Developments in World Seismology,1993,2(1):1-4.
[2]WONG R H C,HUANG M L,JIAO M R,et al.Themechanisms of crack propagation from surface 3-Dfracture under uniaxial compression[J].Key EngineeringMaterials,2004,261:219-224.
[3]WONG R H C,LAW C M,CHAU K T,et al.Crackpropagation from 3-D surface fractures in PMMA andmarble specimens under uniaxial compression[J].International Journal of Rock Mechanics and MiningSciences,2004,41(3):360-366.
[4]WONG R H C,GUO Y S H,LI L Y,et al.Anti-wingcrack growth from surface fault in real rock underuniaxial compression[C]//The 16th European Conferenceof Fracture(ECF16).Greece:[s.n.],2006.
[5]WONG R H C,GUO Y S H,CHAU K T,et al.Thefracture mechanism of 3D surface fault with strain andacoustic emission measurement under axialcompression[J].Key Engineering Materials,2007,358:2360-3587.
[6]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 Yan-shuang,HUANG Kai-zhu,ZHU Wei-shen,et al.Study on fracture pattern of open surface flaw ingabbro[J].Chinese Journal of Rock Mechanics andEngineering,2007,26(3):525-531.
[7]刘力强,刘培洵,黄凯珠,等.断层三维扩展过程的实验研究[J].中国科学D辑:地球科学,2008,38(7):833-841.
[8]谢海峰,饶秋华,王志.反平面剪切(III型)加载下脆性岩石的断口分析[J].岩石力学与工程学报,2007,26(9):1832-1839.XIE Hai-feng,RAO Qiu-hua,WANG Zhi.Fracturemorphology analysis of brittle rock under anti-plane shear(mode III)loading[J].Chinese Journal of RockMechanics and Engineering,2007,26(9):1832-1839.
[9]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):289-296.LI Ting-chun,LüHai-bo.CT real-time scanning tests onsingle crack propagation under triaxial compression[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(2):289-296.
[10]郭彦双,朱维申.压剪条件下预埋椭圆裂纹三维扩展实验研究[J].固体力学学报,2011,32(1):64-73.GUO Yan-shuang,ZHU Wei-shen.Experimental study ofthree-dimensional(3-D)propagation from a pre-existingellipse flaw under compression-shearing[J].ChineseJournal of Solid Mechanics,2011,32(1):64-73.
[11]李新平,肖桃李,汪斌,等.锦屏大理岩不同应力路径下加卸载试验研究[J].岩石力学与工程学报,2012,31(5):882-889.LI Xin-ping,XIAO Tao-li,WANG Bin,et al.Experimental study of Jinping marble under loading andunloading stress paths[J].Chinese Journal of RockMechanics and Engineering,2012,31(5):882-889.
[12]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):1666-1673.XIAO Tao-li,LI Xin-ping,JIA Shan-po.Triaxial testresearch and mechanical analysis based on structuresurface effect of the deep rock mass with single fissure[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(8):1666-1673.
[13]李晓红,卢义玉,康勇,等.岩石力学实验模拟技术[M].北京:科学出版社,2007:6-24.
[2]WONG R H C,HUANG M L,JIAO M R,et al.Themechanisms of crack propagation from surface 3-Dfracture under uniaxial compression[J].Key EngineeringMaterials,2004,261:219-224.
[3]WONG R H C,LAW C M,CHAU K T,et al.Crackpropagation from 3-D surface fractures in PMMA andmarble specimens under uniaxial compression[J].International Journal of Rock Mechanics and MiningSciences,2004,41(3):360-366.
[4]WONG R H C,GUO Y S H,LI L Y,et al.Anti-wingcrack growth from surface fault in real rock underuniaxial compression[C]//The 16th European Conferenceof Fracture(ECF16).Greece:[s.n.],2006.
[5]WONG R H C,GUO Y S H,CHAU K T,et al.Thefracture mechanism of 3D surface fault with strain andacoustic emission measurement under axialcompression[J].Key Engineering Materials,2007,358:2360-3587.
[6]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 Yan-shuang,HUANG Kai-zhu,ZHU Wei-shen,et al.Study on fracture pattern of open surface flaw ingabbro[J].Chinese Journal of Rock Mechanics andEngineering,2007,26(3):525-531.
[7]刘力强,刘培洵,黄凯珠,等.断层三维扩展过程的实验研究[J].中国科学D辑:地球科学,2008,38(7):833-841.
[8]谢海峰,饶秋华,王志.反平面剪切(III型)加载下脆性岩石的断口分析[J].岩石力学与工程学报,2007,26(9):1832-1839.XIE Hai-feng,RAO Qiu-hua,WANG Zhi.Fracturemorphology analysis of brittle rock under anti-plane shear(mode III)loading[J].Chinese Journal of RockMechanics and Engineering,2007,26(9):1832-1839.
[9]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):289-296.LI Ting-chun,LüHai-bo.CT real-time scanning tests onsingle crack propagation under triaxial compression[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(2):289-296.
[10]郭彦双,朱维申.压剪条件下预埋椭圆裂纹三维扩展实验研究[J].固体力学学报,2011,32(1):64-73.GUO Yan-shuang,ZHU Wei-shen.Experimental study ofthree-dimensional(3-D)propagation from a pre-existingellipse flaw under compression-shearing[J].ChineseJournal of Solid Mechanics,2011,32(1):64-73.
[11]李新平,肖桃李,汪斌,等.锦屏大理岩不同应力路径下加卸载试验研究[J].岩石力学与工程学报,2012,31(5):882-889.LI Xin-ping,XIAO Tao-li,WANG Bin,et al.Experimental study of Jinping marble under loading andunloading stress paths[J].Chinese Journal of RockMechanics and Engineering,2012,31(5):882-889.
[12]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):1666-1673.XIAO Tao-li,LI Xin-ping,JIA Shan-po.Triaxial testresearch and mechanical analysis based on structuresurface effect of the deep rock mass with single fissure[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(8):1666-1673.
[13]李晓红,卢义玉,康勇,等.岩石力学实验模拟技术[M].北京:科学出版社,2007:6-24.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心