摘要
采用非稳定渗流理论研究了托巴土石围堰临水坡体的非稳定渗流场规律,探讨了在水位下降过程中临水坡体的浸润线、水力坡降以及流速的变化规律,并对坡体非稳定渗流场对围堰边坡稳定性的影响规律开展了研究;考察了不同水位下降速度和坡体填筑料对上游坡体非稳定渗流场和稳定性的影响规律.分析成果表明,过快的水位下降速度和填筑料较小的渗透性对堰坡的稳定性不利.通过研究获得了坡体填筑材料渗透系数的控制范围,以及不同渗透系数土料条件下应该控制的水位安全降速,并提出了一个可以保证围堰边坡安全的水位快速下降方案.研究结论可为围堰和土坝工程设计和安全运行提供有益的参考.
The unsteady seepage laws of the Tuoba earth-rock cofferdam have been researched by unsteady seepage theory. The changes on the saturation line, hydraulic gradient and velocity during the decline of water level are explored; and the influences of hydraulic conductivity and water level dropping speed on seepage and slope stability are demonstrated. The finite element calculation result indicates that excessive speed and smaller permeability of the filling material are detrimental to the slope stability. The control range of the slope filling material＇s hydraulic conductivity and water level of safety falling velocity under different hydraulic conductivity＇s filling material are obtained; and a solution of water level＇s rapid falling to guarantee the slope safe is proposed. The conclusion may provide useful references for the earth dam design and safe operation.
出处
《武汉大学学报（工学版）》
CAS
CSCD
北大核心
2012年第2期193-199,共7页
Engineering Journal of Wuhan University
关键词
土石围堰
渗透系数
浸润线
水力坡降
稳定安全系数
cofferdam
hydraulic conductivity
saturation line
hydraulic gradient
stability safety factor
