基于安全监测成果的硗碛土石坝渗流稳定分析  

Seepage Stability Analysis of Qiaoqi Earth Rock Dam Based on Safety Monitoring Results

作　　者：王继刚 向银霞 WANG Jigang;XIANG Yinxia(Northwest Engineering Co., LTD, Xi'an, Shanxi, 710065)

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,陕西西安710065

出　　处：《四川水力发电》2020年第3期104-110,共7页Sichuan Hydropower

摘　　要：土石坝的渗流稳定对于土石坝的安全运行起着至关重要的作用。根据实测渗流渗压监测成果,运用多种分析方法,研究了硗碛砾石土心墙土石坝的渗流渗压分布特征及发展变化规律。心墙消减水头作用显著,防渗效果良好;河谷防渗墙与两岸防渗帷幕后最高渗压水位与库水位相差90 m以上,水位折减效果明显,坝基防渗体系防渗效果较好;两岸绕坝渗流水位变幅很小,多数测孔长期处于干孔状态,绕坝渗流现象不明显;大坝最大渗流量为19.1 L/s,多年平均渗流量9.44 L/s,远低于设计值,且呈逐年减少趋势。分析成果表明:由心墙、防渗墙、帷幕组成的坝体坝基防渗体系防渗效果良好。The seepage stability of earth rock dam plays an important role in the safe operation of the dam.Based on the monitoring results of seepage water and pressure,the distribution characteristics and development of seepage water and pressure of Qiaoqi gravel core earth rock dam are studied by using various analysis methods.The water head reduction effect of the core wall is significant and the seepage control effect is good;the water level difference between the maximum seepage pressure water level behind the river valley impervious wall and the impervious curtain at both banks and the reservoir water level is more than 90m,the water level reduction effect is obvious,and the seepage control effect of the dam foundation seepage control system is good;the variation of the seepage water level around the dam at both banks is very small,most of the measuring holes are in the dry hole state for a long time,and the seepage around the dam is not obvious;the maximum seepage flow of the dam is 19.1L/s,with annual average seepage flow is 9.44L/s,which is far lower than the design value and shows a decreasing trend year by year.The analysis results show that the seepage control system of dam foundation composed of core wall,impervious wall and curtain has good seepage control effect.

关 键 词：土石坝 渗流 稳定分析 监测成果 硗碛水电站 

分 类 号：TV641.4[水利工程—水利水电工程] O357.3[理学—流体力学]