一、概述本文结合三峡泄水深孔的模型试验,着重研究压板坡度(S)的变化对短管泄流能力和沿程压力分布的影响。并根据深孔运用水头,在不发生空化水流的前提下,提出泄水短管压板段的优化坡度。在保持压板段起始断面高度D_3不变的情况下(即保持检修门槽后进口断面尺寸不变),改变压板坡度、抬高深孔出口断面高度D_2,使其泄流能力增大(含压板坡度变缓流量系数增加和孔口高度增大流量增加两部分),深孔孔数减少。或者缩小除出口控制断面外的 I. INTRODUCTION In this paper, the model test of deep-hole drainage in the Three Gorges Project is carried out to study the influence of the variation of pressure plate slope (S) on the discharge capacity and the pressure distribution along the pipe. And based on the use of deep hole head, without the occurrence of cavitation flow under the premise of proposed drainage short tube plate section of the optimal gradient. Maintain the plateau section of the initial cross-section height D_3 unchanged (ie maintain the maintenance door groove inlet cross-section size unchanged), change the pressure plate slope, raise the deep hole exit section height D_2, so that the discharge capacity increases (including plate Slope gradient flow coefficient increases and the orifice height increases flow increases in two parts), the number of deep holes reduced. Or reduce the export control section outside