大坝粘土防渗层锤击法测试分析研究
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摘要
某水电厂大坝为粘土斜墙堆石坝,其粘土防渗层的状态如裂纹、密实性、一致性等对大坝安全十分重要。本文应用锤击法对该大坝进行了实地测试,测试装备为GeometricsC48型地震勘探主机系统。对测试数据用Matlab软件分别进行了频散分析,衰减系数与能量分析,波速计算分析,有效评价了大坝粘土防渗层的状态。分析结果表明,大坝粘土防渗层第11列和12列之间,30列和31列测点之间存在明显的衰减系数突变带,个别点波速低。
A rockfill dam with clay facing is studied and its earth blanket's states such as crack,compactness and consistency are important to the safety of the dam.Spot test is carried on with Geometrics C48 seismic exploration system in this dam.Frequency dispersion,attenuation coefficient,energy and wave speed are analyzed for the testing data by Matlab software.The earth blanket's state of the dam is estimated efficiently.It is indicated by the analysis result that there is break belt of attenuation coefficient between row11 and row12,row30 and row 31.Maybe there is long crack or loose soil.At the same time,the speed of some point is low.
A rockfill dam with clay facing is studied and its earth blanket's states such as crack,compactness and consistency are important to the safety of the dam.Spot test is carried on with Geometrics C48 seismic exploration system in this dam.Frequency dispersion,attenuation coefficient,energy and wave speed are analyzed for the testing data by Matlab software.The earth blanket's state of the dam is estimated efficiently.It is indicated by the analysis result that there is break belt of attenuation coefficient between row11 and row12,row30 and row 31.Maybe there is long crack or loose soil.At the same time,the speed of some point is low.
引文
[1]潘纪顺,刘保金,朱金芳等.城市活断层高分辨率地震勘探震源对比试验研究[J].地震地质,2002,24(4):535
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[5]W Zhang,T X Liu.“The Research of Rare Earth-Iron Giant Magnetostrictive Seismic Source of Shallow Seismic Exploration”,International Symposium on Instrumentation Science and Technology[J].Journal of Physics:Conference Series48,(2006).
[2]何振才,唐健.高精度水上浅层地震勘探方法应用研究[J].水利水电快报,2002,23(3):29-30
[3]王峰,阮斌.浅层地震勘探震源性状探讨[J].上海地质,2005(2):46-47
[4]王运生,王家映,郭玉松.实测面波频散曲线计算方法研究与应用实例[J].工程勘察,2004,(6):60-61
[5]W Zhang,T X Liu.“The Research of Rare Earth-Iron Giant Magnetostrictive Seismic Source of Shallow Seismic Exploration”,International Symposium on Instrumentation Science and Technology[J].Journal of Physics:Conference Series48,(2006).
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