某电站取水隧洞与热水回流沟衔接段抗震分析
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摘要
运用动力时程反应分析方法,利用非线性有限差分软件FLAC3D对某电站取水隧洞与热水回流沟衔接段结构进行抗震分析。针对场地地质特征和回填条件分析结构地震响应,通过编制FLAC3D程序并结合五点公式计算衬砌结构的内力,给出了衬砌内力包络图。数值分析结果表明:在相同的荷载效应组合情况下,温度的改变对内力的影响较为显著,温度荷载不仅显著改变了隧洞和热水回流沟衔接段的内力大小,而且改变了某些部位的内力方向;衔接段采用圆形接口优于采用方形接口。
By using the dynamic time-history analysis method,seismic analysis was performed on the joint section between the intake tunnel and the hot-water circumfluence groove for a hydropower station by FLAC3D software.Aiming at the geological characteristics and the backfill condition of the site,analysis of seismic response for the joint section was carried on,and the internal forces of the lining structure were calculated by combining secondary development of FLAC3D with the five-point formula.Based on it,the internal force envelop diagram for the lining structure was presented.Numerical simulation shows that,under identical load effect combination,the effect of temperature on internal forces is remarkable: the variety on temperature load not only significantly changes the value but also changes the orientations of the internal forces for certain parts.Meanwhile,it can be concluded that the circular interface is superior to the square interface for the joint section.
By using the dynamic time-history analysis method,seismic analysis was performed on the joint section between the intake tunnel and the hot-water circumfluence groove for a hydropower station by FLAC3D software.Aiming at the geological characteristics and the backfill condition of the site,analysis of seismic response for the joint section was carried on,and the internal forces of the lining structure were calculated by combining secondary development of FLAC3D with the five-point formula.Based on it,the internal force envelop diagram for the lining structure was presented.Numerical simulation shows that,under identical load effect combination,the effect of temperature on internal forces is remarkable: the variety on temperature load not only significantly changes the value but also changes the orientations of the internal forces for certain parts.Meanwhile,it can be concluded that the circular interface is superior to the square interface for the joint section.
引文
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[2]赵杰,王桂萱,裴强,等.核电厂取水隧洞抗震分析[J].世界地震工程,2009,25(3):135-139.(ZHAOJie,WANG Guixuan,PEI Qiang,et al.Seismic analysisof an intake tunnel for a nuclear power plant[J].WorldEarthquake Engineering,2009,25(3):135-139.(inChinese))
[3]赵杰,王桂萱,裴强,等.某核电厂取水隧洞不同设计方案抗震性能分析[J].防灾减灾学报,2010,26(1):31-35.(ZHAO Jie,WANG Guixuan,PEI Qiang,et al.Seismic analysis of nuclear power project for intake tunnelunder different design scheme[J].Journal of DisasterPrevention and Reduction,2010,26(1):31-35.(inChinese))
[4]赵杰,王桂萱,裴强,等.影响核电厂取水隧洞抗震性能的几个因素分析[J].辽宁工程技术大学学报,2011,30(1):46-49.(ZHAO Jie,WANG Guixuan,PEIQiang,et al.Seismic analysis of nuclear power project forintake tunnel[J].Journal of Liaoning TechnicalUniversity,2011,30(1):46-49.(in Chinese))
[5]SHUKLA D K,RIZZO P C,STEPHENSON D E.Earthquake load analysis of tunnels and shafts[C]//Proceeding of the Seventh World Conference onEarthquake Engineering.Michigan:[s.n.],1980:20-28.
[6]孙钧,侯学渊.地下结构:下册[M].北京:科学出版社,1988:783-794.
[7]郑永来,杨林德,李文艺,等.地下结构抗震[M].上海:同济大学出版社,2005.
[8]FLAC-3D(fast lagrangian analysis of continua in 3dimensions)users manual[R].Minneapolis,Minnesota:Itasca Consulting Group Inc.,2006.
[9]KUHLMEYER R L,LYSMER J.Finite element methodaccuracy for wave propagation problems[J].Journal of theSoil Mechanics and Foundations Division,ASCE,1973,99:421-427.
[10]LYSMER J,KUHLMEYER R L.Finite dynamic model forinfinite media[J].Journal of the Soil Mechanics andFoundations Division,ASCE,1969,95:859-877.
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