宝珠寺重力坝地震前后渗流原观特性对比分析
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摘要
宝珠寺重力坝位于"5.12"特大地震的六大重灾区之一的四川省广元市境内,是接近震中库容最大的电站。监测数据显示地震后大坝坝体结构完整,个别坝段横缝有挤压现象;通过扬压力测值序列和扬压力折减系数的计算分析得出,大坝坝基扬压力无明显变化,只有个别测点测值有小幅波动;测值序列显示大坝渗漏量在震后明显增大,随后减小并呈现出逐步降低的趋势;从渗压等值线及矢量图分析得出震后大坝库区地下水位无明显变化,渗压空间相对稳定。在对大坝监测资料在地震前后对比分析和现场调查的基础上,分析了震后大坝渗流在发生变化的原因,对大坝防渗系统的工作状况做出了基本判断。
Baozhusi gravity dam is near the center of earthquake.The monitoring data showed that the structure of dam was integrated and the transverse joint of individual dam section was squeezed after the earthquake.By calcu-lating and analyzing uplift pressure sequence of measured value and reduction coefficient,it was found that the up-lift pressure at dam foundation had no obvious change after the earthquake,only individual measured values of measuring points took on minor fluctuation.After earthquake,sequence of measured value showed that the seepage volume of the dam increased greatly,reduced subsequently and showed the trend of decreasing gradually.Through the analysis of seepage pressure isoline graphs and vectorgraph,obvious changing was not found at the post-earth-quake groundwater levels of the great dam,seepage pressure space was relatively stable.Based on comparative a-nalysis of dam monitoring data and site investigations before and after earthquake,the change course of dam seep-age after earthquake was analyzed and the working conditions of dam seepage control system was judged basically.
Baozhusi gravity dam is near the center of earthquake.The monitoring data showed that the structure of dam was integrated and the transverse joint of individual dam section was squeezed after the earthquake.By calcu-lating and analyzing uplift pressure sequence of measured value and reduction coefficient,it was found that the up-lift pressure at dam foundation had no obvious change after the earthquake,only individual measured values of measuring points took on minor fluctuation.After earthquake,sequence of measured value showed that the seepage volume of the dam increased greatly,reduced subsequently and showed the trend of decreasing gradually.Through the analysis of seepage pressure isoline graphs and vectorgraph,obvious changing was not found at the post-earth-quake groundwater levels of the great dam,seepage pressure space was relatively stable.Based on comparative a-nalysis of dam monitoring data and site investigations before and after earthquake,the change course of dam seep-age after earthquake was analyzed and the working conditions of dam seepage control system was judged basically.
引文
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