MODIFIED NEWMARK APPROACH FOR EVALUATION OF EARTHQUAKE–INDUCED DISPLACEMENT OF EARTH DAM- APPLYING FOR RE-DIVISION OF SLIDING MASS

Authors

  • Phuong Hong Le
  • Shin-ichi Nishimura
  • Tatsuro Nishiyama
  • Thai Canh Nguyen

Keywords:

Conventional Newmark sliding block, Simplified Bishop method, Earth dam, Re-dividing sliding mass, Earthquake-induced displacement

Abstract

The conventional Newmark sliding block approach for evaluating the earthquake-induced displacement of earth dams is widely used in practice. However, the change in the position of the sliding mass with time when a slip occurs is not taken into account in the conventional Newmark approach when calculating the seismic displacement during an earthquake. Thus, a modified Newmark analysis is presented here in order to consider the influence of the changing position of the sliding mass on the estimated seismic displacement of an earth dam by re-dividing the sliding mass. A comparison of the results of the conventional and the modified Newmark approaches shows that ignoring the change in the sliding mass position over time can lead to the overestimation of the sliding displacement, especially if the Fellenius method, a less rigorous method, is used for evaluating the yield seismic intensity. In this study, the modified Newmark approach, using a relatively easy method among strict methods (simplified Bishop method), leads to a more realistic assessment of the permanent displacement in seismic slope stability analyses.

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Published

2021-10-30

How to Cite

Phuong Hong Le, Shin-ichi Nishimura, Tatsuro Nishiyama, & Thai Canh Nguyen. (2021). MODIFIED NEWMARK APPROACH FOR EVALUATION OF EARTHQUAKE–INDUCED DISPLACEMENT OF EARTH DAM- APPLYING FOR RE-DIVISION OF SLIDING MASS. GEOMATE Journal, 21(86), 1–8. Retrieved from https://geomatejournal.com/geomate/article/view/48

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