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自从出现河南“75·8”洪水后,大中型水库的抗洪标准普遍提高,因泄量大,下游水位高,使许多水头不高的工程存在着用底流消能工程量大造价高,而用挑流消能又挑不出来的矛盾。因此,有些大中型工程采用面流消能。拓林第二溢洪道的消能方案也经过了底流、挑流、面流的变化过程,最终采用面流消能。但面流消能下游水位高,对陡槽护坦板的抗浮稳定不利。针对本溢洪道的具体条件和特点,采取了护坦末端截流封闭护坦排水措施,从而较好地解决了这一矛盾,取得了较显著的经济效果。
Since the “75.8” flood in Henan Province, flood control standards of large and medium-sized reservoirs generally have been raised. Due to the large amount of discharge and the high water level downstream, many under-head projects have the problem of under-flow energy-dissipating projects and high costs. Flow elimination can not pick out the contradiction. Therefore, some large and medium-sized projects use surface energy dissipation. The energy dissipation scheme of Tolo Second Spillway has also undergone the process of undercurrent, pick-off and surface-flow, and eventually dissipated through surface flow. However, the high level downstream of surface energy dissipation can adversely affect the anti-floating stability of the chute plate. In view of the specific conditions and characteristics of this spillway, the measures taken to protect the end of the embankment and close the embankment drainage have been adopted to solve the contradiction and achieve remarkable economic results.