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万安坝址中水河宽约450米,河床基本平整,坝区河道顺直,河床一般高程65.5～68.5米,河槽覆盖层为中粗砂,一般厚度2～5米,其下为砂岩和砂质页岩,质地较新鲜、完整,基岩一般高程60～65米,坝址多年平均流量接近1000秒立米,实测最大流量为15200秒立米,是一条丰水河流,并且是江西省南北的重要交通要道。根据坝址的这些地形地质、水文、航运等特点,采用分期导流方式。位于河床中部的纵向围堰两期共用两面挡水,又因束窄后的河床最大流速一般均在5米/秒以上,要求纵向围堰有较高抗冲能力,断面尺寸不宜过大,故采用混
The waterway of Wanan dam site is about 450 meters wide. The riverbed is basically flat. The riverbed in the dam area is straight and the river bed is generally 65.5-68.5 meters in elevation. The riverbed cover is medium-coarse sand with a thickness of 2-5 meters, with sandstone and Sandy shale, the texture is fresh and complete, the bedrock general elevation of 60 to 65 meters, the dam site for many years the average flow rate close to 1000 seconds of legislation, the maximum measured flow of 15200 seconds of legislation, is a Feng Shui River, and Jiangxi Province is north and south Important traffic arteries. According to the dam site of these topographic features, hydrology, shipping and other characteristics, the use of phased diversion. Longitudinal cofferdams located in the middle part of the riverbed share two sides of the water retaining wall, and the maximum flow velocity of the riverbed after the narrowing is generally above 5m / s. The longitudinal cofferdam is required to have higher impact resistance and the section size should not be too large. Mixed