基于分项系数有限元法的观音岩大坝深层抗滑稳定分析

发布时间：2019-01-19 09:07

【摘要】：材料强度储备系数法在重力坝深层抗滑稳定分析中得到了普遍应用,但该方法未考虑荷载的不确定性,且认为岩体强度可以无限度的降低,其安全系数不能表达坝基实际的可靠度。在分项系数有限元法的基础上提出了一种新的重力坝深层抗滑稳定计算方法——有界降强分项系数法,该方法将影响坝基稳定的变量经分项系数处理后,采用强度储备系数法考虑岩体强度可能的弱化,并以相同岩体抗剪参数的统计规律来控制其弱化下界。采用该方法对观音岩重力坝11号坝段进行了深层抗滑稳定分析,并与传统方法计算结果进行对比,结果表明:所提方法计算的安全系数比分项系数有限元法略大,不同方法计算所得大坝稳定性是一致的,说明所提方法应用于重力坝深层抗滑稳定是合理可行的。
[Abstract]:The method of material strength reserve coefficient has been widely used in the analysis of deep anti-sliding stability of gravity dams, but the method does not take into account the uncertainty of load, and it is considered that the strength of rock mass can be reduced indefinitely. Its safety factor can not express the actual reliability of dam foundation. On the basis of the finite element method of partial coefficient, a new method for calculating the stability of gravity dam in deep layer is put forward, that is, the method of partial coefficient of bounded strength reduction, which deals with the variables that affect the stability of dam foundation. The strength reserve coefficient method is used to consider the possible weakening of rock mass strength and the statistical law of the same rock mass shear parameters is used to control the weakening lower bound. This method is used to analyze the deep anti-slip stability of Guanyin Rock Gravity Dam No. 11 dam, and the results are compared with the traditional calculation results. The results show that the safety factor calculated by the proposed method is slightly larger than that of the finite element method with sub-factor. The dam stability calculated by different methods is consistent, which shows that it is reasonable and feasible to apply the proposed method to the deep sliding stability of gravity dam.
【作者单位】：武汉大学水资源与水电工程科学国家重点实验室;武汉大学水工岩石力学教育部重点实验室;
【分类号】：TV642.3

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