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Seismic active earth pressure on rigid retaining wall having reinforced backfill

Abstract The paper deals with the analysis for determination of lateral thrust on a rigid retaining wall with reinforced earth backfill under seismic condition. The backfill is reinforced with horizontally laid unattached strips/sheets. Seismic forces are considered in terms of seismic coefficients. A coulomb wedge is assumed to develop at limiting equilibrium. Analysis indicates substantial reduction in pressures on the wall due to reinforcement. Results have been presented in the form of non-dimensional charts to give the active earth pressure (<i>P</i>/1/2γH<sup>2</sup>) and (H/H). For given values of angle of friction and seismic coefficients, it was found that the earth pressure decreases significantly with the increase in length of reinforcement-height of wall (<i>L/H</i>) ratio and reinforcement factor (<i>D<sub>p</sub></i> = <i>f <sup>*</sup>H/S<sub>z</sub></i>), <i>f</i><sup>*</sup> and <i>S<sub>z</sub></i> are respectively coefficient of friction between soil and reinforcement, and vertical spacing between reinforcements. Optimum value of length of reinforcement strips/sheets and <i>D<sup>p</sup></i> factor have been found to be about 80 percent of the height of retaining wall and 1.0 respectively.