D0L:10.13374折.issn1001-053x.2012.12.018 第34卷第12期 北京科技大学学。报 Vol.34 No.12 2012年12月 Journal of University of Science and Technology Beijing Dec.2012 断续节理对岩体力学性能的影响 金爱兵)四李兵) 邓富根” 1)北京科技大学土木与环境工程学院，北京1000832)中核第四研究设计工程有限公司，石家庄050000 ☒通信作者，E-mail:jinaibing@usth.edu.cn 摘要采用颗粒流数值模拟程序，建立不同节理状态的岩石试样模型，对其进行双轴试验模拟，从岩桥长度、节理长度和倾 角三个方面对断续节理影响下的岩体破裂形式和力学性质进行了数值模拟分析.岩桥的破裂方式为翼裂纹扩展下的拉剪复 合破坏，模型破裂大致经历了翼裂纹的扩展、次生裂纹的延伸以及岩桥的贯通三个过程，而且表现出明显的蠕变特性以及延 性破坏.岩桥长度的变化对峰值强度和弹性模量影响较小：相比岩桥长度，节理岩样的力学特性对节理长度更加敏感.对于 不同的节理倾角，岩石试件表现出不同的初始破裂形式，0°倾角岩样的破裂方式为翼裂纹的扩展和次生裂纹的延伸，中间岩桥 没有被贯通，15°倾角岩样的初裂强度和峰值强度最大 关键词岩石：节理：力学性质；数值分析：计算机模拟 分类号TU452 Effect of intermittent joints on the mechanical properties of rock mass JNAi-bing,LI Bing》,DENG Fu-gen'” 1)School of Civil and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China 2)The Fourth Research and Design Engineering Corporation of China,Shijiazhuang 050000,China Corresponding author,E-mail:jinaibing@ustb.edu.cn ABSTRACT The models of rock mass with different joint states were established by using particle flow code (PFC)numerical simulation procedures,and then their biaxial test was simulated.The effects of intermittent joints on the rupture forms and mechanical properties of rock mass were numerically analyzed from three aspects of rock bridge length,joint length,and dip angle.The failure mode of rock bridges is mainly tensile-shear failure because of the extension of wing cracks,but the failure mode of the models can be concluded to be the extension of wing cracks and secondary cracks and the failure of rock bridges,exhibiting obvious creep properties and ductile failure.The peak strength and elastic modulus are less influenced by the change in length of rock bridges;however, compared to the length of rock bridges,the mechanical properties of the jointed rock samples are more sensitive to the length of intermittent joints.As far as models with the different dip angles of intermittent joints are concerned,the initial rupture forms of the models are different,the failure mode of the model with the dip angle of0 is the extension of wing cracks and secondary cracks,but the middle rock bridge has not been run through,and the initial crack strength and peak strength of the model with the dip angle of 15 is maximum. KEY WORDS rock:joints:mechanical properties:numerical analysis:computer simulation 岩体是被各种结构面切割成的不连续地质体， 节理和岩桥力学性质的综合影响. 其破坏特征极其复杂，力学性质具有高度的非线性 国内外学者主要从阻力面积比、岩桥破坏、断裂 和各向异性。其中，节理的空间分布、组数及强度等 力学和拉剪复合破坏等理论方面，以及直剪、单轴、 都会对岩体的力学性能产生重大影响口.地质调查 伪三轴室内和数值模拟试验等方面对断续节理岩体 分析表明，岩体内节理面并非全部是贯通的，而可能 做了较多研究.Harrison等回将裂隙岩体力学性质 处于一种非贯通状态，断续节理岩体的强度特性受 归纳为不连续、非均匀、各向异性与非弹性.Gehle 收稿日期：2011-12-05 基金项目：中央直属高校基本科研业务费资助项目(FRF-SD-12002A):霍英东青年教师基金资助项目(122024)第 34 卷 第 12 期 2012 年 12 月 北京科技大学学报 Journal of University of Science and Technology Beijing Vol． 34 No． 12 Dec． 2012 断续节理对岩体力学性能的影响 金爱兵1)  李 兵2) 邓富根1) 1) 北京科技大学土木与环境工程学院，北京 100083 2) 中核第四研究设计工程有限公司，石家庄 050000  通信作者，E-mail: jinaibing@ ustb． edu． cn 摘 要 采用颗粒流数值模拟程序，建立不同节理状态的岩石试样模型，对其进行双轴试验模拟，从岩桥长度、节理长度和倾 角三个方面对断续节理影响下的岩体破裂形式和力学性质进行了数值模拟分析． 岩桥的破裂方式为翼裂纹扩展下的拉剪复 合破坏，模型破裂大致经历了翼裂纹的扩展、次生裂纹的延伸以及岩桥的贯通三个过程，而且表现出明显的蠕变特性以及延 性破坏． 岩桥长度的变化对峰值强度和弹性模量影响较小; 相比岩桥长度，节理岩样的力学特性对节理长度更加敏感． 对于 不同的节理倾角，岩石试件表现出不同的初始破裂形式，0°倾角岩样的破裂方式为翼裂纹的扩展和次生裂纹的延伸，中间岩桥 没有被贯通，15°倾角岩样的初裂强度和峰值强度最大． 关键词 岩石; 节理; 力学性质; 数值分析; 计算机模拟 分类号 TU452 Effect of intermittent joints on the mechanical properties of rock mass JIN Ai-bing1)  ，LI Bing2) ，DENG Fu-gen1) 1) School of Civil and Environmental Engineering，University of Science and Technology Beijing，Beijing 100083，China 2) The Fourth Research and Design Engineering Corporation of China，Shijiazhuang 050000，China  Corresponding author，E-mail: jinaibing@ ustb． edu． cn ABSTRACT The models of rock mass with different joint states were established by using particle flow code ( PFC) numerical simulation procedures，and then their biaxial test was simulated． The effects of intermittent joints on the rupture forms and mechanical properties of rock mass were numerically analyzed from three aspects of rock bridge length，joint length，and dip angle． The failure mode of rock bridges is mainly tensile-shear failure because of the extension of wing cracks，but the failure mode of the models can be concluded to be the extension of wing cracks and secondary cracks and the failure of rock bridges，exhibiting obvious creep properties and ductile failure． The peak strength and elastic modulus are less influenced by the change in length of rock bridges; however， compared to the length of rock bridges，the mechanical properties of the jointed rock samples are more sensitive to the length of intermittent joints． As far as models with the different dip angles of intermittent joints are concerned，the initial rupture forms of the models are different，the failure mode of the model with the dip angle of 0° is the extension of wing cracks and secondary cracks，but the middle rock bridge has not been run through，and the initial crack strength and peak strength of the model with the dip angle of 15° is maximum． KEY WORDS rock; joints; mechanical properties; numerical analysis; computer simulation 收稿日期: 2011--12--05 基金项目: 中央直属高校基本科研业务费资助项目( FRF--SD--12--002A) ; 霍英东青年教师基金资助项目( 122024) 岩体是被各种结构面切割成的不连续地质体， 其破坏特征极其复杂，力学性质具有高度的非线性 和各向异性． 其中，节理的空间分布、组数及强度等 都会对岩体的力学性能产生重大影响［1］． 地质调查 分析表明，岩体内节理面并非全部是贯通的，而可能 处于一种非贯通状态，断续节理岩体的强度特性受 节理和岩桥力学性质的综合影响． 国内外学者主要从阻力面积比、岩桥破坏、断裂 力学和拉剪复合破坏等理论方面，以及直剪、单轴、 伪三轴室内和数值模拟试验等方面对断续节理岩体 做了较多研究． Harrison 等［2］将裂隙岩体力学性质 归纳为不连续、非均匀、各向异性与非弹性． Gehle DOI:10.13374/j.issn1001-053x.2012.12.018