作为采用工程类比分析法评价小湾拱坝稳定性的一部分,本文在ABAQUS非线性有限元平台下,采用精细的三维有限元模型模拟了Klnbrein拱坝运行期随着库水涨落的变形状态,模拟计算得到的坝顶位移时程与实测位移非常接近,坝踵屈服区与拱坝的实际开裂形态也比较类似,说明本文建立的Klnbrein模型基本合理。然后对Klnbrein原拱坝和加固后拱坝进行了超载分析,研究其极限承载力,同时引入四个安全系数评价拱坝四级极限状态。分析结果表明:Klnbrein拱坝坝后支撑体加固对于减小正常工作状态下坝踵屈服区的效果显著,帷幕正常工作安全系数由加固前的0.90提高到1.20,保证了拱坝的正常运行。但是,加固措施对于拱坝的极限承载力提高有限。 As a part of evaluating the stability of Xiaowan arch dam by using engineering analogy analysis, this paper simulates the deformation of Klnbrein arch dam during the operation period with the fluctuation of reservoir water under ABAQUS nonlinear finite element platform by using the precise three-dimensional finite element model. The simulation results show that the displacement time is very close to the measured displacement, and the actual cracking shape of the dam yield zone and arch dam are similar, which shows that the Klnbrein model established in this paper is basically reasonable. Then, the Klnbrein original arch dam and the reinforced arch dam are analyzed for overloading, and the ultimate bearing capacity is studied. At the same time, four safety factors are introduced to evaluate the fourth-order limit state of arch dam. The results show that the reinforcement of the Klnbrein arch dam’s back support body is effective in reducing the yield zone of the heel under normal working conditions. The safety factor of the curtain works from 0.90 before reinforcement to 1.20, which ensures the normal operation of the arch dam . However, the reinforcement measures have limited impact on the ultimate bearing capacity of arch dam.