Xinkeng double-curved arch dam is located in the asymmetric "V" shaped valley in Dejiang County, Guizhou Province.Through technical and economic selection among the arc, parabola, logarithmic spiral double curvature arch dams, the parabolic double-curvature arch dam with equal-thickness was adopted.The spillway with gate controlling is characterized as U-shaped gate support, narrowing sluice hole and equal thickness sluice piers with radial collocation.This optimized layout can fully play the arch structure advantage, and gives the spillway a good adaption to the terrain, greatly reducing the engineering investment.We give a detailed description to the dam body shape selection, shape design and spillway structure design, which provides experiences for building arc dam in narrow river valley with large flood discharge.%贵州省德江县新坑水电站双曲拱坝建在不对称"V"形狭谷中,经过圆弧形、抛物线和对数螺旋线双曲拱坝的技术经济比较,最终择优选择了等厚抛物线双曲拱坝.有闸控制溢洪道采用半圆城门拱支撑、闸孔收缩、闸墩等厚呈径向的布置形式,使坝体结构得到全面优化.上述优化使拱坝结构的特点得以充分发挥,溢洪道布置适应地形条件好,工程投资大大降低.对大坝体形选择、体形设计和溢洪道结构设计作了详细叙述,可为在泄流量大、河谷狭窄的地形建设拱坝提供借鉴.
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