低水头挡水闸下游排水孔失效对闸基渗流场影响分析

Analysis on the influence of low water head sluice downstream drain hole failure on gate foundation seepage field

本文以低水头挡水闸为研究对象,结合工程实例针对低水头挡水闸下游护坦中不同部位的排水孔出现失效时,对闸基的渗透坡降、总水头以及渗流量等因素进行系统的统计分析。结果表明:水闸下游排水孔失效位置距离闸室越远,闸底板的扬压力值越大,渗流量和对应出口处的渗透坡降值越小,对闸基的渗流稳定性越不利。因此在设计及运行的过程中很有必要控制下游护坦中排水孔的失效位置和数量,这样才能保证工程的稳定和安全。

In the paper, low water head sluice is adopted as research object. The engineering example is adopted for systematically and statistically analyzing gate foundation seepage slope reduction, total water head, seepage quantity and other factors during failure of drain hole in low water head retaining sluice downstream apron at different parts. Results show that the further the water sluice downstream drain hole failure position is from the gate room, the larger the uplift pressure value of the gate bottom board will be, and the smaller the seepage quantity a,nt seepage slope reduction value on corresponding outlet will be, which are more unbeneficial for the seepage stability of gate foundation. Therefore, it is necessary to control drain hole failure position and quantity in downstream apron, thereby guaranteeing project stability and safety.