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The approximate distribution of the earth pressure can be determined numerically by computing resultant earth pressure at various depths along the wall. The unit earth pressure calculated on the basis of Coulomb’s and Rankine’s theories varies linearly with depth. But, from experimental data it is found that the unit earth pressure is curvilinearly distributed on the back of the retaining wall. Wang (2000) has considered the Coulomb’s concept as the basis for determining the intensity of earth pressure by the method of horizontal slices. A sliding wedge considered for the analysis is shown in fig.2.38 (a). An element of thickness dy is considered from the wedge at depth y below the surface. The forces on the element are shown in fig.2.38 (b). |
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