某拱坝结构非线性有限元稳定性分析

为分析拱坝坝体与坝肩稳定性,通过建立三维非线性有限元计算模型,计算了基本荷载组合、特殊荷载组合两种工况下拱坝的位移和应力.依据数值计算结果,绘制了位移等及应力等值线,采用有限元分析法分析了坝体应力结果,并从超载安全系数法和点强度储备安全系数法两个角度探讨了坝肩岩体的稳定性,结果表明：1）拱坝的最大位移发生在顺流方向,最大位移值为8.95 mm;2）正常蓄水水位和校核洪水水位时坝体的最大拉、压应力均满足容许应力要求;3）坝肩岩体的安全系数为3.8,满足安全要求.

Non-linear Finite Element Analysis for the Stability of an Arch Dam

For analyzing the stability of an arch dam and its abutment,the 3D non-linear finite element model was established,and the displacement and stress were solved for the basic load combination and special load combination. Then,according to the numerical calculation,some stress and displacement isolines were plotted. After that,the finite element method was adopted to study its stress condition; the dam abutment stability was analyzed by safety coefficient methods of point strength and integral overload. Results show that： 1）the maximum displacement of this dam is 8. 95 mm which presents at down-flow direction;2） both the maximum tension stress and pressure stress meet the requirements of allowable stresses for impounded water level and flood level; 3） the safety coefficient of abutment is3. 8,which means the dam is safe enough.