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本文将重力坝坝体混凝土和坝基岩石分别视为两种线弹性均质材料,并将坝踵裂缝简化为两种介质材料交界面上的裂缝问题。利用异弹模界面裂缝缝端近场应力表达式,采用分区混合有限元法求解坝踵界面裂缝的应力强度因子,编制了自动划分网格,自动编码的有限元计算程序。经分析认为采用S判据进行断裂分析较为合理,最后对重力坝坝踵界面裂缝进行了断裂分析,得出了一些有益的结论。
In this paper, gravity dam body concrete and dam foundation rock are regarded as two kinds of linear elastic homogeneous materials respectively, and the heel cracks are simplified as the cracks on the interface of two kinds of dielectric materials. The stress intensity factor of crack in the heel interface was solved by the method of zonal mixed finite element method, and the finite element program of automatic meshing and automatic coding was developed. After analysis, it is reasonable to use the S criterion to analyze the fracture. Finally, the fracture analysis of the dam cracks in the gravity dam is done, and some useful conclusions are drawn.