汶川地震对陈村坝基渗流影响分析
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摘要
汶川地震发生后不久,陈村大坝坝基帷幕后部的浅层扬压力测孔和深部排水测孔水位普遍下降,坝基渗漏量显著增加,表明坝基岩体和帷幕受地震影响微细裂隙张开,渗透性增强。坝基经过丙凝化学加强灌浆的部位,测孔水位下降幅度较小,水位恢复过程较快,显示出丙凝化灌的优异防渗和抗震性能。汶川地震对陈村大坝的稳定以及坝基岩体和帷幕没有产生损坏,震后约9个月坝基整体防渗功能已基本恢复。
Soon after Wenchuan earthquake,the water levels of shallow uplift pressure and deep drainage observation holes at rear curtain of dam foundation declined,and dam foundation leakage increased significantly,which indicated that,because of earthquake,the micro-cracks in dam foundation rock and the curtain opened wider and permeability was enhanced.At the dam foundation part once acrylamide grouted,the water level stayed higher and recovery process was shorter,which showed that acrylamide grouting was of good seepage-prevention and anti-seismic effect.Wenchuan earthquake did not cause damage to dam stability,foundation rock mass or the curtain.About 9 months after the earthquake,anti-seepage performance of dam foundation recovered.
Soon after Wenchuan earthquake,the water levels of shallow uplift pressure and deep drainage observation holes at rear curtain of dam foundation declined,and dam foundation leakage increased significantly,which indicated that,because of earthquake,the micro-cracks in dam foundation rock and the curtain opened wider and permeability was enhanced.At the dam foundation part once acrylamide grouted,the water level stayed higher and recovery process was shorter,which showed that acrylamide grouting was of good seepage-prevention and anti-seismic effect.Wenchuan earthquake did not cause damage to dam stability,foundation rock mass or the curtain.About 9 months after the earthquake,anti-seepage performance of dam foundation recovered.
引文
[1]陈厚群,徐泽平,李敏.汶川大地震和大坝抗震安全[J].水利学报,2008,(10).
[2]周建平,李昇.汶川地震灾区水电工程震损调查及抗震复核工作简介[J].水力发电,2008,(11).
[3]邢林生,方榴声.陈村水电站大坝坝基渗流监测研究[J].水利学报,1990,(8).
[2]周建平,李昇.汶川地震灾区水电工程震损调查及抗震复核工作简介[J].水力发电,2008,(11).
[3]邢林生,方榴声.陈村水电站大坝坝基渗流监测研究[J].水利学报,1990,(8).
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