Dynamic active earth pressure on retaining structures |
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Authors: | Deepankar Choudhury Santiram Chatterjee |
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Affiliation: | (1) Department of Civil Engineering, Indian Institute of Technology — Bombay, Powai, 400 076 Mumbai, India |
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Abstract: | Earth-retaining structures constitute an important topic of research in civil engineering, more so under earthquake conditions.
For the analysis and design of retaining walls in earthquake-prone zones, accurate estimation of dynamic earth pressures is
very important. Conventional methods either use pseudo-static approaches of analysis even for dynamic cases or a simple single-degree
of freedom model for the retaining wall-soil system. In this paper, a simplified two-degree of freedom mass-spring-dashpot
(2-DOF) dynamic model has been proposed to estimate the active earth pressure at the back of the retaining walls for translation
modes of wall movement under seismic conditions. The horizontal zone of influence on dynamic earth force on the wall is estimated.
Results in terms of displacement, velocity and acceleration-time history are presented for some typical cases, which show
the final movement of the wall in terms of wall height, which is required for the design. The non-dimensional design chart
proposed in the present study can be used to compute the total dynamic earth force on the wall under different input ground
motion and backfill conditions. Finally, the results obtained have been compared with those of the available Scott model and
the merits of the present results have been discussed. |
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Keywords: | Earth pressure 2-DOF dynamic model translation wall movement earthquake |
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