非贯通节理岩体剪切力学行为细观模拟分析
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摘要
通过引入光滑节理模型,可真实地反映剪切过程中节理岩体力学行为。采用颗粒流软件,从细观角度研究了不同连通率条件下剪切过程中裂纹扩展规律和剪裂面应力分布特征。研究结果表明:颗粒流数值模拟软件可以较好地再现和重复节理岩体直剪试验;细观数值模拟分析可得到剪切过程节理岩体剪切面应力分布情况;随连通率增大,节理岩体对应峰值强度减小,产生张拉裂纹比例降低;在剪切过程中剪应力不断变化,试样受到的水平剪切力主要由中间岩桥承担,两边节理只承担小部分剪力。
By introducing a smooth joint model,the mechanical behavior of the jointed rock mass during shearing can be truly reflected. Particle flow software was used to study the crack propagation law and shear stress distribution characteristics under different joint connectivity from a meso-perspective. The results of meso-simulation analysis show that: Particle flow numerical simulation software can well reproduce and repeat jointed rock mass direct shear test. The numerical simulation analysis of the meso-scale can obtain the stress distribution in the shear plane of jointed rock mass in shear process. With the increase of joint connectivity,the corresponding peak intensity of jointed rock mass increases,and the proportion of tensile cracks increases. In the process of shearing,the shear stress changes continuously,the horizontal shear force of the specimen is mainly borne by the intermediate rock bridge,and the joints on both sides only bear a small part of the shear force.
By introducing a smooth joint model,the mechanical behavior of the jointed rock mass during shearing can be truly reflected. Particle flow software was used to study the crack propagation law and shear stress distribution characteristics under different joint connectivity from a meso-perspective. The results of meso-simulation analysis show that: Particle flow numerical simulation software can well reproduce and repeat jointed rock mass direct shear test. The numerical simulation analysis of the meso-scale can obtain the stress distribution in the shear plane of jointed rock mass in shear process. With the increase of joint connectivity,the corresponding peak intensity of jointed rock mass increases,and the proportion of tensile cracks increases. In the process of shearing,the shear stress changes continuously,the horizontal shear force of the specimen is mainly borne by the intermediate rock bridge,and the joints on both sides only bear a small part of the shear force.
引文
[1]朱维申,李术才,陈卫忠.节理岩体破坏机制和锚固效应及工程应用[M].北京:科学出版社,2002.
[2]韩智铭,乔春生,涂洪亮.含一组贯通节理岩体强度的各向异性分析[J].中国矿业大学学报,2017,46(5):1073-1083.
[3]王泳嘉,邢纪波.离散单元法及其在岩土力学中的应用[M].沈阳:东北大学出版社,1991.
[4] PFC2D(particle flow code in 2 dimensions)users guide[R].Minneapolis:Itasca consulting group,2008:42.
[5]周健,池永,池毓蔚,等.颗粒流方法及PFC2D程序[J].岩土力学,2000,21(3):271-274.
[6]庄宁.裂隙岩体渗流应力耦合状态下裂纹扩展机制及其模型研究[D].上海:同济大学,2006.
[7] PARK J W,SONG J J. Numerical simulation of a direct shear teston a rock joint using a bonded-particle model[J]. Internationaljournal of rock mechanics and mining sciences,2009,46(8):1315-1328.
[8]夏才初,宋英龙,唐志成,等.粗糙节理剪切性质的颗粒流数值模拟[J].岩石力学与工程学报,2012,31(8):1545-1552.
[9]周喻,MISRAA,吴顺川,等.岩石节理直剪试验颗粒流宏细观分析[J].岩石力学与工程学报,2012,31(6):1245-1256.
[10]余华中,阮怀宁,褚卫江.弱化节理剪切力学特征的颗粒流模拟研究[J].岩土力学,2016,37(9):2712-2720.
[11]余华中,阮怀宁,褚卫江.岩石节理剪切力学行为的颗粒流数值模拟[J].岩石力学与工程学报,2013,32(7):1482-1490.
[12] BAHAADDINI M,SHARROCK G,HEBBLEWHITE B K. Nu-merical direct shear tests to model the shear behaviour of rockjoints[J]. Computers&geotechnics,2013,51(51):101-115.
[13] BAHAADDINI M,HAGAN P C,MITRA R,et al. Parametricstudy of smooth joint parameters on the shear behaviour of rockjoints[J]. Rock mechanics&rock engineering,2015,48(3):923-940.
[14] MEHRANPOUR M H,KULATILAKE P H S W. Improvements forthe smooth joint contact model of the particle flow code and its ap-plications[J]. Computers&geotechnics,2017,87:163-177.
[15]刘顺桂,刘海宁,王思敬,等.断续节理直剪试验与PFC2D数值模拟分析[J].岩石力学与工程学报,2008,27(9):1828-1836.
[16]刘远明.基于直剪试验的非贯通节理岩体扩展贯通研究[D].上海:同济大学,2007.
[17]万江.基于PFC2D边坡失稳破坏研究[J].施工技术,2016,45(S2):92-94.
[18]陈亚东,王安汀,蔡江东,等.螺杆桩细观工作机理离散元数值模拟[J].施工技术,2017,46(24):68-70.
[2]韩智铭,乔春生,涂洪亮.含一组贯通节理岩体强度的各向异性分析[J].中国矿业大学学报,2017,46(5):1073-1083.
[3]王泳嘉,邢纪波.离散单元法及其在岩土力学中的应用[M].沈阳:东北大学出版社,1991.
[4] PFC2D(particle flow code in 2 dimensions)users guide[R].Minneapolis:Itasca consulting group,2008:42.
[5]周健,池永,池毓蔚,等.颗粒流方法及PFC2D程序[J].岩土力学,2000,21(3):271-274.
[6]庄宁.裂隙岩体渗流应力耦合状态下裂纹扩展机制及其模型研究[D].上海:同济大学,2006.
[7] PARK J W,SONG J J. Numerical simulation of a direct shear teston a rock joint using a bonded-particle model[J]. Internationaljournal of rock mechanics and mining sciences,2009,46(8):1315-1328.
[8]夏才初,宋英龙,唐志成,等.粗糙节理剪切性质的颗粒流数值模拟[J].岩石力学与工程学报,2012,31(8):1545-1552.
[9]周喻,MISRAA,吴顺川,等.岩石节理直剪试验颗粒流宏细观分析[J].岩石力学与工程学报,2012,31(6):1245-1256.
[10]余华中,阮怀宁,褚卫江.弱化节理剪切力学特征的颗粒流模拟研究[J].岩土力学,2016,37(9):2712-2720.
[11]余华中,阮怀宁,褚卫江.岩石节理剪切力学行为的颗粒流数值模拟[J].岩石力学与工程学报,2013,32(7):1482-1490.
[12] BAHAADDINI M,SHARROCK G,HEBBLEWHITE B K. Nu-merical direct shear tests to model the shear behaviour of rockjoints[J]. Computers&geotechnics,2013,51(51):101-115.
[13] BAHAADDINI M,HAGAN P C,MITRA R,et al. Parametricstudy of smooth joint parameters on the shear behaviour of rockjoints[J]. Rock mechanics&rock engineering,2015,48(3):923-940.
[14] MEHRANPOUR M H,KULATILAKE P H S W. Improvements forthe smooth joint contact model of the particle flow code and its ap-plications[J]. Computers&geotechnics,2017,87:163-177.
[15]刘顺桂,刘海宁,王思敬,等.断续节理直剪试验与PFC2D数值模拟分析[J].岩石力学与工程学报,2008,27(9):1828-1836.
[16]刘远明.基于直剪试验的非贯通节理岩体扩展贯通研究[D].上海:同济大学,2007.
[17]万江.基于PFC2D边坡失稳破坏研究[J].施工技术,2016,45(S2):92-94.
[18]陈亚东,王安汀,蔡江东,等.螺杆桩细观工作机理离散元数值模拟[J].施工技术,2017,46(24):68-70.