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为确保大坝渗流安全,从扬压力角度定性分析了古田溪四级大坝坝基扬压力监测资料,计算了高水位时段的渗压系数,并运用逐步回归分析法建立了扬压力统计模型对其进行定量分析。结果表明,扬压力受上游水位、降雨、温度和时效的影响,其中时效分量在各分量中占主导因素。扬压力纵向分布除渗#1测压孔外,总体呈河床坝段低、岸坡坝段高的特点,横向分布为从上游至下游测压孔水位逐渐降低,扬压力变化规律正常,对坝基稳定不构成威胁。但渗#1测压孔扬压水位明显异常增大,需进一步分析论证。
In order to ensure the seepage safety of the dam, the monitoring data of the uplift pressure of the dam foundation of the fourth grade of Gutian River were qualitatively analyzed from the perspective of uplift pressure, the seepage coefficient of high-water level period was calculated, and the statistical model of uplift pressure was established by stepwise regression analysis Quantitative analysis. The results show that the uplift pressure is affected by the upstream water level, rainfall, temperature and aging, among which the aging component plays a dominant role. The longitudinal distribution of vertical pressure in addition to the infiltration of # 1 piezoresistive pressure hole, the overall riverbed dam section is low, the slope of the dam section of the high horizontal distribution of the pressure from the upstream to the downstream pore water level gradually decreased, the normal pressure changes, the dam foundation Stability does not pose a threat. However, the infiltration pressure of # 1 piezometric hole was obviously abnormally increased, which requires further analysis and demonstration.