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一、前言 龙羊峡水电站底孔系枢纽最低层的泄水设施,担负着导流洞下闸蓄水后,向下游供水、初期泄洪、排沙及放空水库等任务。 底孔泄水道布置于右岸第11~#坝段内,出坝后沿岸坡傍山开挖而成的基岩平台上,紧靠主厂房端墙通过,至下横围堰堰顶处设贴角曲面扭斜鼻坎将水流挑入下游河床。泄水道生长约300米,由约长60米的坝内压力段、约长22米的坝后弧门闸室段及约长200米的明流泄槽部分组成。其平面,纵剖面见图1。
I. INTRODUCTION The drainage facilities at the lowest level of the bottom hole of the Longyangxia Hydropower Station are responsible for such tasks as water supply to the lower reaches, flood discharge and sediment discharge and venting reservoirs after the diversion tunnel is charged with water from the lower gate. Bottom hole drainage channels arranged in the right bank section 11 ~ # dam, after the dam along the bankside slope excavation made of bedrock platform, close to the main plant end wall through to the top of the lower cross weir weir Angular surface slanted nose ridge will flow into the downstream river bed. The drainage channel is about 300 meters long and consists of a dam pressure section of about 60 meters in length, an arc gate section of about 22 meters long in the dam and a Mingliu drain section of about 200 meters in length. Its plane, longitudinal section shown in Figure 1.