河谷地形对高土石坝动力反应特性影响的分析
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摘要
应用三维完全非线性动力弹塑性分析方法,研究了狭窄河谷中高土石坝的动力反应特性,通过计算分析,给出了不同河谷形状特性下高土石坝的剪应变和永久位移分布规律。结果表明:狭窄河谷地形导致大坝动力反应表现出较强的空间三维效应,河谷形状对坝体的剪应变和位移有显著影响;对称河谷时坝体的剪应变呈椭圆形往外延伸,最大值出现在坝顶心墙处;当河谷宽高比相对较小时,河谷形状对坝体的约束作用较强,位移增大的趋势相对较为明显;在同样河谷形状特性的情况下,宽河谷情况下的位移较缓岸坡情况下坝顶沉降要大些。本文结论可为狭窄地形强震地区的大坝设计提供依据。
Three-dimensional nonlinear dynamic elasto-plastic analysis method is employed to study the seismic response characteristics of a high earth-rockfill dam in a narrow valley.The distribution rules of shear strain and permanent displacement are given with different topographies of valley.The results show that the dynamic response of the dam exhibits strong spatial three-dimensional effect of valley topography and that the shear strain and displacement of the dam has significant effects.For the symmetrical valley,the distribution of shear strain is extending out in an oval shape,and the maximum value appears at the crest of the core wall.When the shape factor of the ratio(L/H) is smaller,the constraint to the dam is stronger,and the displacement increases more obviously.Under the same ratio,the settlement of dam crest under a wider valley is larger than that under a gentler slope.The results are valuable for the design of high earth-rockfill dams with a narrow valley in meizoseismal areas.
Three-dimensional nonlinear dynamic elasto-plastic analysis method is employed to study the seismic response characteristics of a high earth-rockfill dam in a narrow valley.The distribution rules of shear strain and permanent displacement are given with different topographies of valley.The results show that the dynamic response of the dam exhibits strong spatial three-dimensional effect of valley topography and that the shear strain and displacement of the dam has significant effects.For the symmetrical valley,the distribution of shear strain is extending out in an oval shape,and the maximum value appears at the crest of the core wall.When the shape factor of the ratio(L/H) is smaller,the constraint to the dam is stronger,and the displacement increases more obviously.Under the same ratio,the settlement of dam crest under a wider valley is larger than that under a gentler slope.The results are valuable for the design of high earth-rockfill dams with a narrow valley in meizoseismal areas.
引文
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[13]徐泽平.混凝土面板堆石坝应力应变特性研究[M].郑州:黄河水利出版社,2005.(XU Ze-ping.Stress anddeformation properties of CFRD[M].Zhengzhou:YellowRiver Conservancy Press,2005.(in Chinese))
[14]毛文娟.强震区高土石坝三维动力反应分析[D].大连:大连理工大学,2008.(MAO Wen-juan.3-D dynamicanalysis of high rockfill dam in meizoseismal area[D].Dalian:Dalian University of Technology,2008.(in Chinese))
[2]赵剑明,常亚屏,陈宁.加强高土石坝抗震研究的现实意义及工作展望[J].世界地震工程,2004(1):95-99.(ZHAO Jian-ming,CHANG Ya-ping,CHEN Ning.Significance and prospects about earthquake Resistant studiesof high earth-rockfill dams[J].Journal of World EarthquakeEngineering,2004(1):95-99.(in Chinese))
[3]顾淦臣.土石坝地震工程[M].南京:河海大学出版社,1989.(GUO Gan-chen.Earth dam earthquakeengineering[M].Nanjing:Hohai University Press,1989.(inChinese))
[4]朱晟,欧红光,殷彦高.狭窄河谷地形对200m级高面板坝变形和应力的影响研究[J].水力发电学报,2005(4):73-77.(ZHU Sheng,OU Hong-guang,YIN Yan-gao.Influence of narrow-valley formation on the mechanicsproperty of the 200m high CFRD[J].Journal of HydroElectric Engineering,2005,24(4):73-77.(in Chinese))
[5]徐泽平,邵宇,胡本雄,等.狭窄河谷中高面板堆石坝应力变形特性研究[J].水利水电技术,2005,36(5):30-33.(XU Ze-ping,SHAO Yu,HU Ben-xiong,et al.Study onstress and deformation properties of high concrete facerock-fill dam in narrow valley[J].Journal of Water Resourcesand Hydropower Engineering,2005,36(5):30-33.(inChinese))
[6]程嵩,张嘎,张建民,等.河谷地形对面板堆石坝应力位移影响的分析[J].水力发电学报,2008(5):53-58.(CHENG Song,ZHANG Ga,ZHANG Jian-min,et al.Effectof foundation topograpgy on the stress-displacement responseof concrete faced rockfill dam[J].Journal of Hydro ElectricEngineering,2008,27(5):53-58.(in chinese))
[7]宋文晶,王彭煦.河谷地形对面板坝防渗体系安全性的影响[J].水力发电学报,2008(4):94-100.(SONG Wen-jing,WANG Peng-xu.Influence of valley topography on the saftyof CFRD anti-seepage systems[J].Journal of Hydro ElectricEngineering,2008,27(4):94-100.(in Chinese))
[8]朱晟,王继敏.建造在狭窄河谷上的高混凝土面板堆石坝[J].红水河,2004,23(4):81-88.(ZHU Sheng,WANGJi-min.High CFRDs built in narrow valley[J].Journal of RedRiver,2004,23(4):81-88.(in Chinese))
[9]彭文斌.FLAC3D实用教程[M].北京:机械工业出版社,2008.(PENG Wen-bin.FLAC3D practical guide[M].Beijing:Mechanical Industry Press,2008.(in Chinese))
[10]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2009.(CHEN Yu-min,XU Ding-ping.Foundation and examples of FLAC/FLAC3D[M].Beijing:China Water Conservancy and Hydropower Press,2009.(inChinese))
[11]黄润秋,许强.显示拉格朗日差分分析在岩石边坡工程中的应用[J].岩石力学与工程学报1995,14(4):346-354.(HUANG Run-qiu,XU Qiang.Application of explicitlagrangian finite-difference method in rock slopeengineering[J].Chinese Journal of Rock Mechanics andEngineering,1995,14(4):346-354.(in Chinese))
[12]朱亚林.地震时高土石坝的弹塑性分析和抗震措施研究[D].大连:大连理工大学,2011.(ZHU Ya-lin.Study onelasto-plastic method and aseismc measures of highearth-rockfill dam during earthquake[D].Dalian:DalianUniversity of Technology,2011.(in Chinese))
[13]徐泽平.混凝土面板堆石坝应力应变特性研究[M].郑州:黄河水利出版社,2005.(XU Ze-ping.Stress anddeformation properties of CFRD[M].Zhengzhou:YellowRiver Conservancy Press,2005.(in Chinese))
[14]毛文娟.强震区高土石坝三维动力反应分析[D].大连:大连理工大学,2008.(MAO Wen-juan.3-D dynamicanalysis of high rockfill dam in meizoseismal area[D].Dalian:Dalian University of Technology,2008.(in Chinese))
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