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针对有限单元法在重力坝建基面抗滑稳定控制中量化标准缺失的问题,采用自适应隐式本构积分算法推导了修正的Mohr-Coulomb准则,通过ABAQUS编写成UMAT子程序,用于重力坝建基面抗滑稳定分析,并针对典型重力坝坝型选取常见下游坝坡率,应用强度折减系数法分析了同一网格尺寸下不同坝高对建基面屈服区的影响。结果表明,在对应建基面屈服区贯通率达到15%时的强度折减系数随坝高增加而降低,且在强度折减系数小于1.8时建基面的屈服范围与坝高呈正相关,强度折减系数为1.6时具有明显的线性关系,并结合工程实例验证了结论的可靠性。
Aiming at the problem that the finite element method is lack of the quantitative standard in the anti-sliding stability control of the gravity dam foundation, the revised Mohr-Coulomb criterion is deduced by using the adaptive implicit constitutive integral algorithm. The UMAT subroutine is programmed by ABAQUS for gravity Based on the analysis of anti-slide stability of dam foundation and the selection of common downstream dam slope for typical gravity dam, the influence of different dam height on the yield area of foundation is analyzed by the method of strength reduction coefficient. The results show that the strength reduction coefficient decreases with the increase of dam height when the penetration rate reaches 15% in the corresponding basal area. When the strength reduction coefficient is less than 1.8, the yield area of the foundation surface has a positive correlation with the dam height. The strength When the reduction coefficient is 1.6, it has a clear linear relationship, and the reliability of the conclusion is verified with engineering examples.