深厚覆盖层上堆石坝坝基廊道抗震安全性评价
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摘要
为探讨深厚覆盖层上堆石坝坝基廊道地震反应规律并评价其抗震安全性,以金平沥青混凝土心墙堆石坝为背景工程,在三维非线性静力分析基础上,采用子模型技术对坝基廊道进行了地震动力时程分析,坝体材料及覆盖层采用Hardin-Drnevich动力本构模型,采用薄层单元模拟各类接触面.计算成果显示,廊道中部动应力反应相对较大,地震过程中其应力变形极值相对静力工况变化较小;设计地震对廊道与两岸灌浆平洞接缝的变形影响不大;坝基廊道与沥青混凝土心墙的连接部位始终处于受压状态,对该部位止水的防渗可靠性有利.总体来说,坝基廊道的抗震安全性是有保障的.
To explore the seismic response features of the foundation gallery of rockfill dam on deep overburden and evaluate its seismic safety,Jinping rockfill dam with asphalt concrete core is taken as a studying case.Based on three-dimensional nonlinear static analysis,submodeling method is used to make time-history analysis of the foundation gallery.The filling materials of dam and alluvium deposit are simulated by Hardin-Drnevich dynamic constitutive model.The thin-layer contact element is used to simulate the contact surfaces.The results indicate that the dynamic stresses show a stronger response in the middle of the gallery.During the seismic history,the deformation and stress extremums of the gallery were basically invariant compared to the static state.The design seismic load has little effect on the structure joints between the gallery and grouting adit.The joint section between foundation gallery and asphalt concrete core is always in compression during the seismic history;it is beneficial to the reliability of the water stop structure in that region.In sum the earthquake resistance safety of the foundation gallery is verified.
To explore the seismic response features of the foundation gallery of rockfill dam on deep overburden and evaluate its seismic safety,Jinping rockfill dam with asphalt concrete core is taken as a studying case.Based on three-dimensional nonlinear static analysis,submodeling method is used to make time-history analysis of the foundation gallery.The filling materials of dam and alluvium deposit are simulated by Hardin-Drnevich dynamic constitutive model.The thin-layer contact element is used to simulate the contact surfaces.The results indicate that the dynamic stresses show a stronger response in the middle of the gallery.During the seismic history,the deformation and stress extremums of the gallery were basically invariant compared to the static state.The design seismic load has little effect on the structure joints between the gallery and grouting adit.The joint section between foundation gallery and asphalt concrete core is always in compression during the seismic history;it is beneficial to the reliability of the water stop structure in that region.In sum the earthquake resistance safety of the foundation gallery is verified.
引文
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[2]陈刚,马光文,付兴友,等.瀑布沟大坝基础防渗墙廊道连接型式研究[J].四川大学学报(工程科学版),2005,37(3):32-36.
[3]吴梦喜,余学明,叶发明.高心墙堆石坝坝基防渗墙与心墙连接方案研究[J].长江科学院院报,2010,27(9):59-64.
[4]熊堃,何蕴龙,伍小玉,等.长河坝坝基廊道应力变形特性研究[J].岩土工程学报,2011,33(11):1767-1774.
[5]Bandis S C,Lumsden A C,Barton N R.Fundamen-tals of rock joint deformation[J].International Journalof Rock Mechanics and Mining,1983,20(6):249-268.
[6]Clough G W,Duncan J M.Finite element analysis of re-taining wall behavior[J].Journal of the Soil Mechanicsand Foundations DIVI,1971,97(12):1657-1673.
[7]熊堃,何蕴龙,曹学兴.观音岩水电站混合坝插入式接头的抗震性能[J].天津大学学报,2010(7):583-592.
[8]吴秋军,傅少君.子模型方法研究瀑布沟土石坝防渗结构[J].武汉大学学报(工学版),2006,39(3):55-59.
[9]赵吉坤,朱小春,石端学,等.子模型法在小湾拱坝结构诱导缝及检查廊道中的应用[J].河海大学学报(自然科学版),2007,35(3):298-301.
[10]刘晓青,李同春,闫园园,等.地震作用下混凝土坝孔口应力分析的动力子模型法[J].水力发电学报,2009(05):88-91.
[11]顾淦臣.土石坝地震工程[M].南京:河海大学出版,1989.
[12]姚福海.深厚覆盖层上土石坝基础廊道的结构形式探讨[J].水力发电,2010,36(6):54-55,59.
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