【作者】 王冕； 陈群；

【Author】 Wang Mian;Chen Qun;State Key Laboratory of Hydraulics and Mountain River Engineering,School of Water Resources and Hydropower,Sichuan University;

【机构】 四川大学水利水电学院水力学与山区河流保护国家重点实验室；

【摘要】 水库蓄水速度直接影响土石坝的渗流安全,当心墙土石坝的心墙填料不均匀时,蓄水速度的影响会更大。本文利用饱和—非饱和土渗流理论,针对心墙填料不均情况下水库蓄水速度对渗流场的影响开展数值模拟研究,探讨蓄水速度对填筑不均匀的心墙瞬态渗流场的影响,分析心墙内孔压和水力坡降以及心墙抗渗安全系数的变化,为以后类似工程的施工和设计提供参考。分析结果表明,心墙填料不均时,随着蓄水速度的增大,在心墙下部填料不均区下游侧的饱和区范围变小,心墙内最大水力坡降增大。心墙上部填料不均区的最大水力坡降值明显大于下部,其抗渗安全系数也较下部小。更多还原

【Abstract】 Reservoir filling velocity directly influences seepage safety of the embankment dams. The influence is more evident when the material of core wall is not uniform. Numerical simulation was conducted to investigate the influence of the reservoir filling velocity on the seepage in the non-uniform core wall using saturated-unsaturated seepage theory. The change in the pore water pressure,the hydraulic gradient and the safety factor of seepage resistance in the core wall were analyzed. The results can provide reference for design and construction of similar projects. The results show that with the increase in the reservoir filling velocity the saturated area near the downstream side in the lower non-uniform zone reduces and the hydraulic gradient in the core wall increases. The maximum hydraulic gradient in the upper non-uniform zone is evidently larger than that in the lower non-uniform zone in the core wall,so the safety coefficient of seepage resistance in the upper non-uniform zone is less.更多还原