密云水库白河主坝渗流安全性分析

Seepage analysis of Baihe dam of Miyun Reservoir

为评估密云水库白河主坝安全运行状况,基于建库以来白河主坝62年的渗流监测数据,采用过程线分析、相关性分析、渗透坡降分析等方法,对大坝的渗流安全性进行了评估。结果表明在白河主坝的长期运行过程中,测压管水位变化趋势总体较为正常,但个别测压管存在异常。各渗流监测断面的渗透坡降均远小于设计渗透坡降值,坝体渗透稳定。由于防渗墙的作用,使坝体内部的浸润线沿着斜墙部位快速下降,坝后浸润线渗入坝基,防渗效果较好。本研究成果可为白河主坝的安全运行提供支撑。

To evaluate the safe operation of Baihe dam of Miyun Reservoir,this paper evaluates the seepage stability of the dam by analysing process line,correlation,seepage gradient,etc.,based on 62 years of seepage monitoring data of Baihe dam since the construction of Miyun Reservoir.The results show that the water level of piezometric tubes is generally normal during the long-term operation,although several piezometric tubes are abnormal.The seepage gradient of each monitoring section is far less than the designed seepage gradient,so the permeability of the dam is stable.Due to the effect of the impervious wall,the phreatic lines inside the dam body drop rapidly along the inclined wall,and the phreatic lines behind the dam penetrate into the dam foundation,so the impervious effect is good.The research results can provide support for the safe operation of the Baihe Dam.