使用渗压系数评价运行期坝基扬压力的利弊探讨  

Advantages and Disadvantages of the Evaluation of the Uplift Pressure on Dam Foundation during Operation using the Seepage Pressure Coefficient

作　　者：毛鹏 郭法旺 蔡大咏 MAO Peng;GUO Fawang;CAI Dayong(Powerchina Guiyang Engineering Corporation,Guiyang 550081,China)

机构地区：[1]中国电建集团贵阳勘测设计研究院有限公司,贵州贵阳550081

出　　处：《水电与新能源》2024年第9期59-62,共4页Hydropower and New Energy

基　　金：贵州省科技支撑计划(一般项目)(黔科合支撑[2023]一般251)。

摘　　要：在混凝土坝运行过程中,通常采用渗压系数评价坝基扬压力的大小,并进一步评价大坝渗控系统的工作性态。根据沙沱、光照水电站的实测数据分析发现,采用渗压系数作为监控指标虽然简单、直观,但并不能真实反映坝基的工作状况。建议设计单位在进行结构计算时,除了提供单一的扬压力系数取值外,还应根据计算工况、安全余度反算各坝段的扬压力控制值供运行单位使用;运行单位在日常资料分析中,除了关注扬压力系数及扬压力外,还应该结合其变化过程及其他监测项目综合分析。During the operation of concrete dams,the seepage pressure coefficient is usually used to evaluate the magnitude of the uplift pressure on the dam foundation and further assess the working performance of the seepage control system.Based on the analysis of the measured data from Shatuo and Guangzhao Hydropower Stations,it is found that using the seepage pressure coefficient as the monitoring indicator cannot truly reflect the working conditions of the dam foundation,although simple and intuitive.It is thus recommended that in the structural calculation of dams,the design unit should not only provide simple uplift coefficient values,but also back calculate the uplift pressure control values for each dam monolith based on the calculation conditions and the safety margins to the operation unit.The operation unit should not only focus on the uplift pressure coefficient and the uplift pressure in the daily data analysis,but also analyze their variation process and other monitoring items.

关 键 词：坝基渗压系数 扬压力 监控指标 抗滑稳定 建基面应力 

分 类 号：TV642.3[水利工程—水利水电工程]