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1 概况河南省燕山水库泄洪洞工程施工时,其防洪标准采用20年一遇,相应最大洪峰流量为5287m~3/s,根据坝址下游210m处的河道水位～流量关系曲线得出,相应出口洪水位91.65m,而泄洪(导流)洞出口地面高程有较大部分在此水位以下,因此需要修建出口围堰,另外出口消力池最低建基面75.89m,且围堰基础有砂卵石层与河床砂卵石层相连,故采用基础防渗措
1 Overview Yanshan reservoir spillway tunnel construction in Henan Province, the flood control standards with 20 years once the case, the corresponding maximum peak flow of 5287m ~ 3 / s, according to the dam site 210m downstream of the river water level ~ flow curve obtained, the corresponding exit Flood 91.65m, while the flood discharge (diversion) hole outlet height of the ground there is a greater part of the water level below, so the need to build an outlet cofferdam, the other exit of the lowest pool basins 75.89m, and cofferdam base with sand and gravel Layer and sand bed gravel layer connected, so the use of basic anti-seepage measures