1　概　述满拉水利枢纽工程泄洪建筑物采用侧槽溢流堰泄洪洞 ,布置在拦河坝的右岸 ,属 等 2级永久建筑物 .泄洪洞为“龙抬头”式明流隧洞 ,断面为城门洞型 ,底宽 7m,高 10 .5 m;围岩为新鲜辉绿岩和微风化辉绿岩 ;在“龙抬头”反弧段末端向下游30 m,底板衬砌厚度为 1.0 m,其余 1 Overview Manla water conservancy project flood discharge structures using side overflow weir spillway tunnel, arranged in the right bank of the dam, a Class 2 permanent buildings, etc. The spillway tunnel is a “dragon head” style flow tunnel, section of the city gate type , The bottom width is 7m and the height is 10.5m. The surrounding rock is fresh diabase and slightly weathered diabase. At the end of “Longquotou” anti-arc section, 30m downstream, the thickness of bottom lining is 1.0m, and the rest