用非线性有限元对小湾高拱坝（坝高292.0m)设周边缝时的工作性态进行研究。模型中考虑了缝面应力与变位的非线性重调整，考虑了坝体、坝基材料非线性和周边缝接触非线性的耦合，模拟了缝的开裂、滑移等非线性。对设缝深度、范围、以及干缝、湿缝等对高拱坝拱冠、坝踵和坝肩等关键部位的位移场和应力场的影响进行了分析研究，并对设缝前后建基面、坝踵附近的开裂区和屈服区进行分析，研究结果表明，设周边缝可以有效地降低高拱坝坝踵的梁向拉应力，对坝踵附近应力影响较大，坝体其它部位应力和位移变化不大。

The nonlinear effect of perimeter joint on the performance of Xiao Wan high arch dam (292.0m high) is studied with nonlinear FEM in this paper. Nonlinear relation between the stress and deformation on the surface of the joint is adopted, and coupling effect between material nonlinearity of the dam, foundation and contact nonlinerity of joint is considered, opening and slipping of the joint are modeled in the analysis. Variation of the stress and displacement at the key location of the arch dam with perimeter joint on different crack depth, different elevation and with or without water pressure on the crack face is compared. Crack and yield near dam heel with or without joint are studied, The result of analysis demonstrates that setting perimeter joint could reduce cantilever stress near the dam heel effectively, and the stress near dam heel with joint has a great improvement ,while little difference of stress and displacement occurs on the other location of the dam.