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动力分析法常用于大型土石坝的砂壳和坝基地层的地震液化验算和坝坡抗震稳定计算,拟静力分析法仍广泛用于中小型土石坝的砂壳和坝基地层的抗震稳定计算。但拟静力分析和动力分析至今沿用总应力法。总应力法存在一些缺点,例如:①动剪切强度和动内摩擦角是用动三轴试验按一定破坏标准决定的,而破坏标准有颇大的任意性,还存在着争论;②上述参数仅与坝体和地基的静应力有关,而没有与坝体和地基的动力反应联系起来;③试样的破坏面与坝体和地基内的破坏面不一致。由于这些理由,上述方法计算成果的精度值得怀疑。为了改进分析方法,本文提出验算液化和坝坡抗震稳定的有效应力动力分析法。此外,作者强调研究土石坝的粘土心墙或斜墙地震裂缝的重要性,并对这个问题的研究方法提出建议。
The dynamic analysis method is often used in the seismic liquefaction calculation of large-scale earth-rock dams and the base layer of the dam, and the seismic stability calculation of the dam slope. The pseudo-static analysis method is still widely used in the seismic stability calculation of the sand and dam base layers of small and medium-sized earth and rockfill dams. . However, the quasi-static analysis and dynamic analysis still use the total stress method. The total stress method has some shortcomings. For example: 1 Dynamic shear strength and dynamic internal friction angle are determined by a dynamic triaxial test according to certain damage criteria, and the destruction criterion has considerable arbitrariness. There is still controversy; 2 above parameters It is only related to the static stress of the dam body and the foundation, but not to the dynamic response of the dam body and foundation. 3 The failure surface of the specimen is inconsistent with the dam surface and the failure surface in the foundation. For these reasons, the accuracy of the above-mentioned method’s calculation results is doubtful. In order to improve the analysis method, this paper proposes an effective stress dynamic analysis method for checking the liquefaction and dam slope stability. In addition, the author emphasizes the importance of studying the seismic cracks in the clay core or slanted wall of earth-rock dams and puts forward suggestions for research methods on this issue.