水位下降时均质土坝非稳定渗流的分析  

Unsteady Seepage Analysis on Homogeneous Earth Dam during Dropdown of Water Level

作　　者：王亚月[1] 王振华[1] 刘建军[1] 

机构地区：[1]石河子大学水利建筑工程学院,石河子832003

出　　处：《石河子大学学报（自然科学版）》2014年第2期238-243,共6页Journal of Shihezi University(Natural Science)

基　　金：国家自然科学基金项目(51369027)

摘　　要：对于均质土坝,水位下降易使坝坡内外水压不平衡,形成不利坝坡的非稳定渗流而导致坝坡失稳,并对土坝安全造成隐患。为了研究库水位下降产生的非稳定渗流对均质土坝坝体边坡稳定性的影响,本文利用有限元分析方法,通过对不同参数不同取值的算例分析了均质土坝在库水位下降时的稳定性情况,结果表明:库水位下降易形成对上游坝坡稳定不利的逆向渗流,对于均质土坝坝体的稳定性影响较大,当渗透系数为1×10-4cm/s,水位下降速度超过1 m/d时,坝体内浸润线变化极小,水位下降速度达到下降标准。For homogeneous earth dam,the water level dropped so dam and outside pressure imbalance is easy to form a non-steady flow negative slope,resulting in slope instability,cause of dam safety hazard.In order to study the unsteady flow generated when the water level dropped,the impact on the dam slope stability.In this paper we used finite element analysis method,the different values of different parameters numerical examples stable homogeneous earth when dropped in water level of the situation.The results showed that：the water level dropped formed on the upstream slope stability unfavorable reverse flow easily,when the hydraulic conductivity of 1 ×10-4cm/s,the water level dropped faster than 1m/d,the dam seepage line changes within the minimal,speed of falling water arrived to the drop standards.

关 键 词：水位下降 均质土坝 非稳定渗流 渗透系数 

分 类 号：TV641.2[水利工程—水利水电工程]