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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.
Unsteady seepage theory was used to study the unsteady seepage field of the watercrop slope near the watercourse of the Toba cofferdam. The infiltration line, hydraulic gradient and hydraulic velocity of the watercourse slope were discussed. Body unsteady seepage field on the stability of cofferdam slope was studied.The influence of different water level descent speed and slope filling materials on the unsteady seepage field and stability of the upstream slope was investigated.The analysis results show that, The declining speed of the water level and the weak permeability of the filling material are unfavorable to the stability of the weir slope.The control range of the permeability coefficient of the slope filling material is obtained through the research and the water level to be controlled under the different permeability coefficient of soil material And puts forward a fast water level drop plan that can guarantee the safety of the cofferdam slope.The research conclusion can provide a useful reference for the design and safe operation of cofferdam and earth dam engineering.