拉哇高面板堆石坝极限抗震能力分析.pdf

《拉哇高面板堆石坝极限抗震能力分析.pdf》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、水利水电技术第48卷2017年第7期拉哇高面板堆石坝极限抗震能力分析王京，朱晟(河海大学水利水电学院，江苏南京210098)摘要：拉哇面板堆石坝位于金沙江上游基本烈度达Ⅷ度的强震区，为评价其极限抗震能力，采用堆石体地震残余变形、坝坡动力稳定、面板应力以及面板脱空等指标，研究了规范反应谱、坝址一致概率反应谱以及设定地震反应谱等不同反应谱在不同峰值加速度下大坝的地震动反应。结果表明：在同一反应谱下随着峰值加速度的提高，大坝的动力反应逐渐增大；不同反应谱在相同峰值加速度下大坝的动力反应呈现较大差异。一致概率反应谱条件下大坝的加速度反应、面板脱空量、堆石体残余

2、变形和下游坝坡的滑动都明显大于规范谱和设定地震谱；设定地震谱下的大坝动力反应则略高于规范反应谱。结合反应谱的生成方式，宜选取设定地震反应谱对拉哇面板堆石坝的极限抗震能力进行评价。计算得到拉哇面板坝的极限抗震能力在0．559一0．69。关键词：堆石坝；地震；永久变形；面板脱空；坝坡稳定；大坝安全doi：10．13928／j．cnki．wrahe．2017．07．005中图分类号：TV641+TV312文献标识码：A文章编号：1000—0860(2017)07—0028—07AnalysisonultimateseismiccapacityofhighLa

3、waConcreteFaceRockfillDamWANGJing，ZHUSheng(CollegeofWaterConservancyandHydropowerEngineering，HohaiUniversity，Nanjing210098，Jiangsu，China)Abstract：LawaConcreteFaceRockfiliDamislocatedinthestrongearthquakeregionwithbasicintensityⅧoftheUpperJin—shajiangRiver．Inordertocalculatetheuh

4、imateseismiccapacityofthedam，theindexes，suchasseismicresidualdeforma—tionoftherockfillbody，dynamicstabilityofthedamslope，stressofthefaceslab，voidunderthefaceslab，etc．，areadoptedforstudyingthedamseismicdynamicresponsesofvariousresponsespectra，i．e．thestandardresponsespectrum，theco

5、nsist—entprobabilityresponsespectrumatthedamsiteandthesettingseismicresponsespectrumundervariouspeakaccelerations．Theresultshowsthatunderthesameresponsespectrum，thedamdynamicresponseincreasesalongwiththeincreaseofthepeakacceleration，whilethedamdynamicresponsepresentsalargerdiffe

6、renceunderthesamepeakaccelerationwithdifferentresponsespectrum．Undertheconsistentprobabilityresponsespectrum，theaccelerationresponseofthedam，thevoidunderthefaceslab，theseismicresidualdeformationoftherockfillbodyandtheslidingofthedownstreamslopeareallobviouslylargerthanthoseunder

7、boththestandardresponsespectrumandthesettingseismicresponsespectrum，whilethedamdy·namicresponseunderthesettingseismicresponsespectrumisalittlebithigherthanthatunderthestandardresponsespec—trum．Combinedwiththegenerationmodeofthespectrum，thesettingseismicresponsespectrumisbetterto

8、beselectedforassessingtheultimateseismiccapacit