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万安水利枢纽,采用分期导流法。第一期先围左岸,第一期围堰围护左岸基坑的时间由当年10月至次年3月仅一个枯水期。据5%频率瞬时洪峯流量设计,围堰最大高度达11公尺。由于围堰高度不大,又属临时性建筑物,确定第一期围堰全部采用土石围堰,并不作清基处理。由于围堰轴线范围以内,河床砂卵石复盖层较厚,一般在6公尺左右,尤其是左岸沙滩部份,最深者竟达18公尺。上层并为厚约3—4公尺的细
Wanan Water Control Project, using phased diversion method. The first phase of the first left bank, the first phase of cofferdam retaining left bank foundation pit time from October to March next year, only a dry season. According to the instantaneous 5% frequency peak flood flow design, cofferdam maximum height of 11 meters. As cofferdam height is not large, but also a temporary building, to determine the first phase of the cofferdam all use of rock cofferdam, not for clearance treatment. Due to the axis of the cofferdam, the sand and pebble cover of the river bed is relatively thick, generally about 6 meters, especially the part of the beach on the left bank, with the deepest reaching 18 meters. The upper and thin 3-4 cm thick