Effect of Wall Inclination on Dynamic Active Thrust for Cohesive Soil Backfill
Abstract
Design of retaining walls under seismic conditions is based on the calculation of seismic earth pressure
behind the wall. To calculate the seismic active earth pressure behind the vertical retaining wall, many researchers report
analytical solutions using the pseudo-static approach for both cohesionless and cohesive soil backfill. Design charts have
been presented for the calculation of seismic active earth pressure behind vertical retaining walls in the non-dimensional
form. For inclined retaining walls, the analytical solutions for the calculation of seismic active earth pressure as well as the
design charts (in non-dimensional form) have been reported in few studies for c-ϕ soil backfill. One analytical solution for
the calculation of seismic active earth pressure behind inclined retaining walls by Shukla (2015) is used in the present study
to obtain the design charts in non-dimensional form. Different field parameters related with wall geometry, seismic loadings,
tension cracks, soil backfill properties, surcharge and wall friction are used in the present analysis. The present study has
quantified the effect of negative and positive wall inclination as well as the effect of soil cohesion (c), angle of shearing
resistance (ϕ), surcharge loading (q) and the horizontal and vertical seismic coefficient (kh and kv) on seismic active earth
pressure with the help of design charts for c-ϕ soil backfill. The design charts presented here in non-dimensional form are
simple to use and can be implemented by field engineers for design of inclined retaining walls under seismic conditions. The
active earth pressure coefficients for cohesionless soil backfill achieved from the present study are validated with studies
reported in the literature.
References
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