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小湾拱坝是该工程设计的难点之一，坝高２９２ｍ，河谷较宽，坝顶弦长８２６ｍ，地震设防标准高，设计加速度为０．３０８ｇ；坝址区分布有多条回级以上断层及蚀变带，岩体卸荷发育深．坝体的应力及变位和两岸坝肩岩体的变位都达到了相当高的量级，拱坝设计中遇到的许多问题已超出了现行拱坝设计规范的范围．在这些特定的条件下，设计出一个合理安全的拱坝是相当困难的．本文简要介绍了小湾拱坝在可行性设计阶段（原称初步设计阶段）的体形优化、坝体应力分析、坝肩岩体稳定分析，以及基础处理等方面的设计内容．
Xiaowan arch dam is one of the difficulties in the project design. The dam height is 292m, the river valley is wide, the crest of the crest is 826m, the seismic fortification standard is high, and the designed acceleration is 0.308g. There are several faults above the back- And alteration zone, rock unloading deep development. The stress and displacement of the dam body and the displacement of the abutment shoulder rock mass in the two banks have reached quite high magnitudes. Many problems encountered in the design of the arch dam have exceeded the scope of the current arch dam design code. Under these specific conditions, it is quite difficult to design a reasonable and safe arch dam. This article briefly introduces the design of Xiaowan Arch Dam in shape optimization, dam stress analysis, stability analysis of abutment rock mass and basic treatment in the feasibility design phase (formerly called the preliminary design phase).