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一、引言 紫金县白溪水库是1978年度兴建的以发电为主的中型水库。流域面积36.7平方公里(其中外引7.7平方公里),兴利库容1760万立米,最大坝高52米。由于在狭窄峡谷地段兴建土坝,两岸坝肩边坡较陡(在40°～45°间),沿溢洪道轴线土层厚度1～2米,下层是比较完整的花岗岩岩基,采用带2米高的混凝土平面闸的普通开敞式溢洪道,在泄五百年一遇设计流量(Q=320m~3/S)和万年一遇加百分之五十的保坝下泄洪水流量(Qmax=1064m~3/S)情况下,溢洪道宽30米,开挖方量7.9万立米(其中土方2.6万立米,石方5.3万立米),工程造价52.09万元(直接费)。为了降低工程量和造价,我们采用了侧槽式溢洪道进行比较。
I. Introduction Baiji Reservoir Zijin County was built in 1978 to generate electricity-based medium-sized reservoirs. The drainage area of 36.7 square kilometers (of which 7.7 square kilometers cited), Xing Likong capacity of 17.6 million cubic meters, the maximum dam height of 52 meters. Due to the construction of the earth dam in the narrow canyon section, the steep shoulder slopes of the two sides are steep (between 40 ° and 45 °) and the thickness of the soil layer along the spillway axis is 1 to 2 meters. The lower layer is a relatively complete granite basement, The average open spillway with high concrete flat gates is designed with a design flow (Q = 320m ~ 3 / S) once every five hundred years and a dam flow rate of 50% (Qmax = 1064m ~ 3 / S), the spillway is 30 meters wide and the excavation volume is 79,000 cubic meters (of which 26,000 cubic meters of earth and 53,000 cubic meters of stone). The project cost is 520,900 yuan (direct fee). In order to reduce the amount of construction and cost, we have used side channel spillway for comparison.