低水位运行工况下输水渠道渗流的数值模拟

Numerical Simulation of the Seepage Flow of Water Delivery Channel under the Condition of Low Water Level Operation

受降水季节变化、各地用水不均衡以及水资源调度等因素的影响,输水渠低位运行的情况较为常见。此时,外部渗水破坏输水渠道的可能性相对增加。为了提升渠道运行安全性,需要对低水位工况下的渗流现象进行分析。首先介绍了计算工况及主要材料参数,随后分析了渗流运动数学模型、有限元数学模型,最后对低水位运行工况下的渗流场进行数值模拟。重点分析渗流阻挡总量、水力坡降、压力水头等指标的影响。研究表明,防渗墙不仅阻滞了94.78%的水渠外部渗水,而且有效控制水力坡降以及压力水头,使得渗流势能未能对输水渠道造成显著冲击。

Affected by the seasonal variation of precipitation, water imbalance and water resources scheduling and other factors, the situation is more common. At this point, the possibility of external water seepage damage to the water channel is relatively increased. In order to improve the operation safety of the channel, need low water seepage phenomenon of condition analysis. First introduces the calculation conditions and main material parameters, then analyze the seepage mathematical mo- tion model, finite element model, the low water level operation under the condition of seepage field numerical simulation. Focus on the analysis of seepage barrier amount, hydraulic gradient, pressure head index. It is shown that the cutoff wall not only block the 94. 78% canal external seepage, but also effectively control hydraulic gradient and the pressure head, the flow potential failed to of water channels have a significant impact.