基于颗粒流的堆石料三轴剪切试验研究
|
摘要
近年来频发的地质灾害使得深入研究大坝堆石体受力变形机制显得愈发迫切和重要。针对堆石颗粒具有形状极其不规则、咬合作用突出的特点,编写了一个简单易用的程序来随机生成形状不规则的数值颗粒。以正四面体为核,按照晶胞繁衍的方式,生成堆石的仿真颗粒集合体。模拟排水剪切条件下的大三轴试验,通过分析数值试验过程中细观参量的变化规律,探讨三轴剪切条件下堆石体变形的细观机制。分析表明,按照晶胞繁衍法生成的数值颗粒与圆颗粒相比能更好地模拟堆石,由颗粒簇形成的咬合力能形成更真实的力-变形关系;数值试验得到的应力-应变曲线和体变曲线与室内三轴试验结果基本一致;颗粒的破碎速率是联系堆石体宏、细观力学性质的重要纽带,通过分析堆石体颗粒破碎4个阶段细观参量的变化规律,深化了对堆石体变形机制的认识。
In recent years the frequent geological disasters make deep research on deformation mechanism for rockfill increasingly urgent and important.Rockfill has the characteristics of irregular shape and prominent interlock behavior;and a simple program is used to generate arbitrary shape of particle clusters.Taking tetrahedron as core,arbitrary shape of particle clusters are generated by crystal cell reproduction method.The particle clusters are used as basic unit to generate aggregation of particles so as to simulate the large scale triaxial drained shear test for rockfill and study the mesoscopic mechanism of rockfill deformation by analyzing the change law of mesoscopic parameters in experiment.The analysis shows that the stress-strain curves and volumetric deformations from numerical simulation are in agreement well with the test results;and the arbitrary shaped clusters are much better than circle particles in simulating the rockfill.The breakage rate is the bridge linking the properties of macroscopic parameters and mesoscopic parameters.With the analysis of the change law of mesoparameters among four stages of particle breakage,the mechanism of rockfill deformation is given.
In recent years the frequent geological disasters make deep research on deformation mechanism for rockfill increasingly urgent and important.Rockfill has the characteristics of irregular shape and prominent interlock behavior;and a simple program is used to generate arbitrary shape of particle clusters.Taking tetrahedron as core,arbitrary shape of particle clusters are generated by crystal cell reproduction method.The particle clusters are used as basic unit to generate aggregation of particles so as to simulate the large scale triaxial drained shear test for rockfill and study the mesoscopic mechanism of rockfill deformation by analyzing the change law of mesoscopic parameters in experiment.The analysis shows that the stress-strain curves and volumetric deformations from numerical simulation are in agreement well with the test results;and the arbitrary shaped clusters are much better than circle particles in simulating the rockfill.The breakage rate is the bridge linking the properties of macroscopic parameters and mesoscopic parameters.With the analysis of the change law of mesoparameters among four stages of particle breakage,the mechanism of rockfill deformation is given.
引文
[1]陈生水,霍家平,章为民.“5.12”汶川地震对紫坪铺混凝土面板坝的影响及原因分析[J].岩土工程学报,2008,30(6):795-801.CHEN Sheng-shui,HUO Jia-ping,ZHANG Wei-min.Analysis of effects of“5.12”Wenchuan earthquake onZipingpu concrete face rockfill dam[J].Chinese Journalof Geotechnical Engineering,2008,30(6):795-801.
[2]郭熙灵,胡辉,包承纲.堆石料颗粒破碎对剪胀性及抗剪强度的影响[J].岩土工程学报,1997,19(3):83-88.GUO Xi-ling,HU Hui,BAO Cheng-gang.Experimentalstudies of the effects of grain breakage on the dilatancyand shear strength of rockfill[J].Chinese Journal ofGeotechnical Engineering,1997,19(3):83-88.
[3]张启岳,司洪洋.粗颗粒土大型三轴压缩试验的强度与应力应变特性[J].水利学报,1982,(9):22-31.ZHANE Qi-yue,SI Hong-yang.Shear strength andstress-strain property of coarse grain soil determined bylarge scale triaxial compression tests[J].Journal ofHydraulic Engineering,1982,(9):22-31.
[4]傅华,凌华,蔡正银.粗颗粒土颗粒破碎影响因素试验研究[J].河海大学学报(自然科学版),2009,37(1):75-79.FU Hua,LING Hua,CAI Zheng-yin.Influencing factorsfor particle breakage of coarse grained soil[J].Journal ofHohai University(Natural Sciences),2009,37(1):75-79.
[5]刘君,刘福海,孔宪京.考虑破碎的堆石料颗粒流数值模拟[J].岩土力学,2009,29(增刊):107-112.LIU Jun,LIU Fu-hai,KONG Xian-jing.Particle flowcode numerical simulation of particle breakage ofrockfill[J].Rock and Soil Mechanics,2009,29(Supp.):107-112.
[6]邵磊,迟世春,贾宇峰.堆石料大三轴试验的细观模拟[J].岩土力学,2009,30(增刊):239-243.SHAO Lei,CHI Shi-chun,JIA Yu-feng.Meso-mechanical simulation of a large scale triaxial test ofrockfill materials[J].Rock and Soil Mechanics,2009,30(Supp.):239-243.
[7]马刚,周伟,常晓林,等.堆石体三轴剪切试验的三维细观数值模拟[J].岩土工程学报,2011,33(5):746-753.MA Gang,ZHOU Wei,CHANG Xiao-lin,et al.3Dmesoscopic numerical simulation of triaxial shear tests forrockfill[J].Chinese Journal of GeotechnicalEngineering,2011,33(5):746-753.
[8]周健,池永.土的工程力学性质的颗粒流模拟[J].固体力学学报,2004,25(4):377-382.ZHOU Jian,CHI Yong.Simulating soil properties byparticle flow code[J].Chinese Journal of SolidMechanics,2004,25(4):377-382.
[9]周健,池永.砂土力学性质的细观模拟[J].岩土力学,2003,24(6):901-906.ZHOU Jian,CHI Yong.Meso-mechanical simulation ofsand mechanical properties[J].Rock and Soil Mechanics,2003,24(6):901-906.
[10]周健,史旦达,贾敏才,等.砂土单调剪切力学性状的颗粒流模拟[J].同济大学学报(自然科学版),2007,35(10):1299-1304.ZHOU Jian,SHI Dan-da,JIA Min-cai,et al.Numericalsimulation of mechanical response on sand undermonotonic loading by particle flow code[J].Journal ofTongji University(Natural Science),2007,35(10):1299-1304.
[11]CHO G C,DODDS J,SANTAMARINA J C.Particleshape effects on packing density,stiffness,and strength:Natural and crushed sands[J].Journal of Geotechnicaland Geoenvironmental Engineering,2006,5:591-602.
[12]LIM W L,MCDOWELL G R.Discrete elementmodelling of railway ballast[J].Granular Matter,2005,7(1):19-29.
[13]LU M,MCDOWELL G R.The importance of modellingballast particle shape in the discrete element method[J].Granular Matter,2006,9(1-2):69-80.
[14]POTYONDY D O,CUNDALL P A.A bonded-particlemodel for rock[J].International Journal of RockMechanics and Mining Sciences,2004,41(11):1329-1364.
[15]CHENG Y P,NAKATA Y,BOLTON M D.Discreteelement simulation of crushable soil[J].Geotechnique,2003,53(7):633-641.
[16]ROBERTSON D,BOLTON M D.DEM simulations ofcrushable grains and soils[C]//The 4th InternationalConference on the Micromechanics of Granular Media.Sendai,Japan:[s.n.],2001:623-626.
[17]ROBERTSON D.Computer simulations of crushableaggregates[D].Cambridge:Cambridge University,2000.
[2]郭熙灵,胡辉,包承纲.堆石料颗粒破碎对剪胀性及抗剪强度的影响[J].岩土工程学报,1997,19(3):83-88.GUO Xi-ling,HU Hui,BAO Cheng-gang.Experimentalstudies of the effects of grain breakage on the dilatancyand shear strength of rockfill[J].Chinese Journal ofGeotechnical Engineering,1997,19(3):83-88.
[3]张启岳,司洪洋.粗颗粒土大型三轴压缩试验的强度与应力应变特性[J].水利学报,1982,(9):22-31.ZHANE Qi-yue,SI Hong-yang.Shear strength andstress-strain property of coarse grain soil determined bylarge scale triaxial compression tests[J].Journal ofHydraulic Engineering,1982,(9):22-31.
[4]傅华,凌华,蔡正银.粗颗粒土颗粒破碎影响因素试验研究[J].河海大学学报(自然科学版),2009,37(1):75-79.FU Hua,LING Hua,CAI Zheng-yin.Influencing factorsfor particle breakage of coarse grained soil[J].Journal ofHohai University(Natural Sciences),2009,37(1):75-79.
[5]刘君,刘福海,孔宪京.考虑破碎的堆石料颗粒流数值模拟[J].岩土力学,2009,29(增刊):107-112.LIU Jun,LIU Fu-hai,KONG Xian-jing.Particle flowcode numerical simulation of particle breakage ofrockfill[J].Rock and Soil Mechanics,2009,29(Supp.):107-112.
[6]邵磊,迟世春,贾宇峰.堆石料大三轴试验的细观模拟[J].岩土力学,2009,30(增刊):239-243.SHAO Lei,CHI Shi-chun,JIA Yu-feng.Meso-mechanical simulation of a large scale triaxial test ofrockfill materials[J].Rock and Soil Mechanics,2009,30(Supp.):239-243.
[7]马刚,周伟,常晓林,等.堆石体三轴剪切试验的三维细观数值模拟[J].岩土工程学报,2011,33(5):746-753.MA Gang,ZHOU Wei,CHANG Xiao-lin,et al.3Dmesoscopic numerical simulation of triaxial shear tests forrockfill[J].Chinese Journal of GeotechnicalEngineering,2011,33(5):746-753.
[8]周健,池永.土的工程力学性质的颗粒流模拟[J].固体力学学报,2004,25(4):377-382.ZHOU Jian,CHI Yong.Simulating soil properties byparticle flow code[J].Chinese Journal of SolidMechanics,2004,25(4):377-382.
[9]周健,池永.砂土力学性质的细观模拟[J].岩土力学,2003,24(6):901-906.ZHOU Jian,CHI Yong.Meso-mechanical simulation ofsand mechanical properties[J].Rock and Soil Mechanics,2003,24(6):901-906.
[10]周健,史旦达,贾敏才,等.砂土单调剪切力学性状的颗粒流模拟[J].同济大学学报(自然科学版),2007,35(10):1299-1304.ZHOU Jian,SHI Dan-da,JIA Min-cai,et al.Numericalsimulation of mechanical response on sand undermonotonic loading by particle flow code[J].Journal ofTongji University(Natural Science),2007,35(10):1299-1304.
[11]CHO G C,DODDS J,SANTAMARINA J C.Particleshape effects on packing density,stiffness,and strength:Natural and crushed sands[J].Journal of Geotechnicaland Geoenvironmental Engineering,2006,5:591-602.
[12]LIM W L,MCDOWELL G R.Discrete elementmodelling of railway ballast[J].Granular Matter,2005,7(1):19-29.
[13]LU M,MCDOWELL G R.The importance of modellingballast particle shape in the discrete element method[J].Granular Matter,2006,9(1-2):69-80.
[14]POTYONDY D O,CUNDALL P A.A bonded-particlemodel for rock[J].International Journal of RockMechanics and Mining Sciences,2004,41(11):1329-1364.
[15]CHENG Y P,NAKATA Y,BOLTON M D.Discreteelement simulation of crushable soil[J].Geotechnique,2003,53(7):633-641.
[16]ROBERTSON D,BOLTON M D.DEM simulations ofcrushable grains and soils[C]//The 4th InternationalConference on the Micromechanics of Granular Media.Sendai,Japan:[s.n.],2001:623-626.
[17]ROBERTSON D.Computer simulations of crushableaggregates[D].Cambridge:Cambridge University,2000.
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