考虑破碎的堆石料颗粒流数值模拟
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摘要
以双江口300 m级高土石坝为工程背景,根据有关资料的试验数据,利用二维颗粒流计算机仿真技术对堆石料在一定围压下的颗粒破碎情况进行了数值模拟,数值试样由2 574个簇颗粒单元组成。数值模拟与室内平面应变试验结果对比表明,用选定的细观参数进行数值模拟与平面应变试验结果基本一致,说明用颗粒流方法进行数值模拟能够较好的再现堆石料的颗粒破碎特性。与室内试验相比,数值仿真模拟还能得到颗粒破碎的细观演化规律和破碎带的分布范围,从而为进一步建立考虑颗粒破碎的堆石坝本构模型,研究大坝填筑、水库蓄水过程以及地震情况下的颗粒破碎过程以及颗粒破碎所引起的坝体变形提供了一条途径。
Based on the related rockfill material tests,the particle flow code computer simulation technology was used to simulate the particle breakage characteristics of rockfill.2 574 particle clusters were used in the simulation.The result of numerical simulation with the selected micro parameters was in agreement well with the result of plane strain laboratory test.So the numerical test can capture the micro phenomenon of particle breakage properly.Compared with the laboratory tests,the numerical simulation can also expose the regularity of evolution of particle breakage microscopically;and the location of the breakage zone.It can be used as the parameters and theoretical basis for the further study of building a rockfill dam model;and then observing the process of particle breakage during the expounding of the reservoir and during earthquakes.And also the displacements of the dam due to the particle breakage and the location of the breakage zone;and the influence on the strength of the rockfill can be researched furthermore.
Based on the related rockfill material tests,the particle flow code computer simulation technology was used to simulate the particle breakage characteristics of rockfill.2 574 particle clusters were used in the simulation.The result of numerical simulation with the selected micro parameters was in agreement well with the result of plane strain laboratory test.So the numerical test can capture the micro phenomenon of particle breakage properly.Compared with the laboratory tests,the numerical simulation can also expose the regularity of evolution of particle breakage microscopically;and the location of the breakage zone.It can be used as the parameters and theoretical basis for the further study of building a rockfill dam model;and then observing the process of particle breakage during the expounding of the reservoir and during earthquakes.And also the displacements of the dam due to the particle breakage and the location of the breakage zone;and the influence on the strength of the rockfill can be researched furthermore.
引文
[1]郭庆国.关于粗粒土抗剪强度特性的试验研究[J].水利学报,1987,(5):59-66.
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[3]刘汉龙,秦红玉,高玉峰,等.堆石粗粒料颗粒破碎试验研究[J].岩土力学,2005,26(4):562-566.
[4]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.
[5]梁军,刘汉龙,高玉峰.堆石蠕变机理分析与颗粒破碎特性研究[J].岩土力学,2003,24(3):479-483.
[6]SEBASTIAN Lobo-Guerrero,LUIS E,Vallejo.Discrete element method evaluation of granular crushing under direct shear test conditions[J].Journal of Geotechnical and Geoenvironmental Engineering,2005,131(10):1 295-1 300.
[7]ROBERT W.Day.Significance of particle crushing in granular materials-discussion[J].Journal of Geotech-nical and Geoenvironmental Engineering
[8]VARADARAJAN A,SHARMA K G,VENKATACHALA K,GUPTA A K.Testing and modeling two rockfill materials[J].Journal of Geotechnical and Geo-environmental Engineering,2003,129(3):206-218.
[9]张家铭,汪稔,张阳明,等.土体颗粒破碎研究进展[J].岩土力学,2003,24(增刊):661-665.
[10]OLIVIER Tsoungui,DENIS Vallet,JEAN-Claude Charmet.Numerical model of crushing of grains inside two dimensional granular materials[J].Powder Technology,1999,105:190-198.
[11]DELUZARCHE R,CAMBOU*B.Discrete numerical modelling of rockfill dams.International journal for numerical and analysisal methods in geomechanics[J].International Journal for Numerical and Analytical Methods in Geomechanics,2006,30:1 075-1 096.
[12]MARSAL R J.Mechanical Properties of Rockfill[M].(Embankment-dam Engineering)Casagrande,Hirschfeld RC,Poulos SJ(eds).New York:Wiley,1973:109-200.
[13]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.
[14]叶朝汉.软土剪切带试验及其应用的研究[博士论文D].上海:同济大学,2007.
[2]柏树田,崔亦昊.堆石的力学性质[J].水力发电学报,1997,(3):21-30.
[3]刘汉龙,秦红玉,高玉峰,等.堆石粗粒料颗粒破碎试验研究[J].岩土力学,2005,26(4):562-566.
[4]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.
[5]梁军,刘汉龙,高玉峰.堆石蠕变机理分析与颗粒破碎特性研究[J].岩土力学,2003,24(3):479-483.
[6]SEBASTIAN Lobo-Guerrero,LUIS E,Vallejo.Discrete element method evaluation of granular crushing under direct shear test conditions[J].Journal of Geotechnical and Geoenvironmental Engineering,2005,131(10):1 295-1 300.
[7]ROBERT W.Day.Significance of particle crushing in granular materials-discussion[J].Journal of Geotech-nical and Geoenvironmental Engineering
[8]VARADARAJAN A,SHARMA K G,VENKATACHALA K,GUPTA A K.Testing and modeling two rockfill materials[J].Journal of Geotechnical and Geo-environmental Engineering,2003,129(3):206-218.
[9]张家铭,汪稔,张阳明,等.土体颗粒破碎研究进展[J].岩土力学,2003,24(增刊):661-665.
[10]OLIVIER Tsoungui,DENIS Vallet,JEAN-Claude Charmet.Numerical model of crushing of grains inside two dimensional granular materials[J].Powder Technology,1999,105:190-198.
[11]DELUZARCHE R,CAMBOU*B.Discrete numerical modelling of rockfill dams.International journal for numerical and analysisal methods in geomechanics[J].International Journal for Numerical and Analytical Methods in Geomechanics,2006,30:1 075-1 096.
[12]MARSAL R J.Mechanical Properties of Rockfill[M].(Embankment-dam Engineering)Casagrande,Hirschfeld RC,Poulos SJ(eds).New York:Wiley,1973:109-200.
[13]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.
[14]叶朝汉.软土剪切带试验及其应用的研究[博士论文D].上海:同济大学,2007.
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