方溪水电站面板缺陷下库水位骤降面板坝渗透稳定性分析  

Analysis of Seepage Stability of Slab Dam with Reservoir Water Level Plummeting under Face Plate Defects of Fangxi Hydropower Station

作　　者：张红萍[1] ZHANG Hongping(College of Architecture and Civil Engineering,Jiangsu City Vocational College Nantong Campus,Nantong 226006,China)

机构地区：[1]江苏城市职业学院建筑工程学院,南通226006

出　　处：《结构工程师》2020年第6期36-43,共8页Structural Engineers

基　　金：江苏省住房和城乡建设厅科学技术指导项目(编号:2018ZD190)。

摘　　要：为研究面板缺陷情况下的渗流特性及稳定性,结合方溪水电站面板坝实际工况,基于饱和-非饱和理论建立了缺陷面板堆石坝有限元模型,利用加拿大著名岩土软件Geo-studio,在不同库水位骤降速率下,对含不同缺陷面板坝的渗透稳定性进行了有限元计算,得到了浸润线、渗漏量及安全系数的变化曲线,结果表明:缺陷对坝体渗流特性影响较大,含缺陷坝体的上游坝坡浸润线显著升高,缺陷尺寸和高程越大,浸润线高程越高;库水位骤降速率对坝体内部浸润线影响较大,当库水位下降时,坝体内部浸润线先疏后密;含缺陷面坝导致坝体渗漏量明显上升;上游坝坡安全系数随库水位下降呈"先降后升"规律。In order to study the seepage characteristics and stability in the case of panel defect,combined with the actual working condition of face dam of Fangxi Hydropower Station,a finite element model of defective face rockfill dam is established based on saturated-unsaturated theory.The finite element model of defect panel is established by using the famous Canadian geotechnical software Geo-studio.Under different water level sudden drop rate,the seepage stability of face slab dam with different defects is calculated by finite element method,and the curves of infiltration line,leakage amount and safety factor are obtained.The results show that:defects have a great influence on the seepage characteristics of the dam body,and the seepage line of the upstream dam slope with defects increases significantly.The larger the defect size and elevation is,the higher the elevation of the seepage line is.The sudden drop rate of the reservoir water level has a great influence on the internal seepage line of the dam body.When the reservoir water level drops,the internal seepage line of the dam body is first sparse and then dense.The dam with defects causes the seepage volume of the dam body to rise significantly.The safety factor of upstream dam slope presents the rule of"first descending and then ascending"with the decrease of reservoir water level.

关 键 词：面板堆石坝 缺陷 数值模拟 库水位骤降 渗漏量 边坡稳定 

分 类 号：TV698.12[水利工程—水利水电工程]