中文摘要：

为了在拱坝优化设计过程中,能够合理地选用建基面岩体变形模量值,通过对各种不同高度拱坝,在不同基岩变模下进行优化设计,得出各高度拱坝最优方案合适基岩变模的大致取值及其变化规律,可供拱坝设计者参考。同时通过对同一拱坝在不同基岩变模下进行坝体应力分析,得出结论：拱坝优化设计时采用较低的基岩变模值,并不能保证坝体更安全;工程中的采用方案,其坝体应力值,必须留有一定的宽裕度,以适应坝基变形模量的变化。

英文摘要：

For choosing the value of deformation modulus reasonably during optimally designing an arch dam,several arch dams with different height which supported by rock bases with various deformation modulus were optimized,and the rough value which was required by arch dams with different height and it＇s variation law were obtained.The law could be referenced by other engineers who want to optimal design an arch dam.At the same time,the stress of an arch dam which was hold by rock bases with different deformation modulus was analyzed.It was concluded that the arch dam will not be more safety when small value of deformation modulus is chosen,and the value of an arch dam＇s body stress should less than the tolerable value in case that the deformation modulus of the rock will change.