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Variation of Dynamic Earth Pressure Due to Sliding of Retaining Walls  

Yoon Suk-Jae (Saman Engrg. Consultants Co.)
Kim Sung-Ryul (Dept. of Civil Engrg., DongA Univ.)
Hwang Jae-Ik (Brain Korea 21, Seoul National Univ.)
Kim Myoung-Mo (The School of Civil, Urban & Geo-Systems, Seoul National Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.21, no.8, 2005 , pp. 55-61 More about this Journal
Abstract
Mononobe-Okabe method is generally used to evaluate dynamic earth pressure for the seismic design of retaining walls. However, Mononobe-Okabe method does not consider the effects of dynamic interactions between backfill soil and walls. In this research, shaking table tests on retaining walls were performed to analyze the phase and magnitude of dynamic earth pressure. The unit weight of walls, the amplitude of input acceleration and the base friction coefficient of walls were varied to analyze the influence of these factors on the dynamic earth pressure. Test results showed that the dynamic earth pressure was 180 degrees out of phase with the wall inertia force for the low sliding velocity of the wall, whereas small peaks of the dynamic earth pressure, which are in phase with the wall inertia force, were developed for the high sliding velocity of the wall. The amplitude of dynamic earth pressure was proportional to that of wall acceleration and the unit weight of the wall. In addition, the dynamic earth forces calculated by the Mononobe-Okabe method were the upper limit of the dynamic earth pressures.
Keywords
Dynamic earth pressure; Earthquake; Inertia force; Phase relation; Retaining wall; Shaking table test;
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