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http://dx.doi.org/10.7843/kgs.2021.37.9.5

Dynamic Factor of Safety Calculation of Slope by Nonlinear Response History Analysis  

Lee, Yonghee (Central Research Institute, Korea Hydro & Nuclear Power Co., Ltd.)
Kim, Hak-Sung (Central Research Institute, Korea Hydro & Nuclear Power Co., Ltd.)
Ju, Young-Tae (R&D Center, NEX Technology Co., Ltd.)
Kim, Daehyeon (Dept. of Civil Engrg., Chosun Univ.)
Park, Heon-Joon (Dept. of Civil Engrg., Seoul National Univ. of Sceince & Technology)
Park, Duhee (Dept. of Civil & Environmental Engrg., Hanyang Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.37, no.9, 2021 , pp. 5-12 More about this Journal
Abstract
Pseudo-static slope stability analysis method is widely used in engineering practice to calculate the seismic factor of safety of slope subjected to earthquake ground motions. Although the dynamic analysis method is well recognized to have the primary advantage of simulating the stress-strain response of soils, it is not often used in practice because of the difficult in estimating the factor of safety. In this study, a procedure which utilizes the dynamic analysis method to extract the transient dynamic factor of safety is devleoped. This method overcomes the major limitation of the pseudo-static method, which uses an empirically determined seismic coefficient to derive the factor of safety. The proposed method is applied to a slope model and the result is compared with that of the pseudo-static method. It is shown that minimum dynamic factor of safety calculated by the dynamic analysis is slightly larger than that determined from the pseudo-static method. It is also demonstrated that the dynamic factor of safety becomes minimum when the horizontal seismic coefficient and horizontal average acceleration are maximum.
Keywords
Dynamic slope stability; Factor of safety; Nonlinear response history analysis; Pseudo-static analysis; Seismic coefficient;
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