A cantilever retaining wall of 7 meter height (Fig. Ex. 11.2) retains sand. The properties of the sand are: e0.5, - 30 and G,2.7. Using Rankine's theory determine the active earth pressure at the base when the backfill is (i) dry, (ii) saturated and (ii) submerged, and also the resultant active force in cach case. In addition determine the total water pressure under the submerged condition. -Backfil uhmerged G,27 Dry backfll Sand Backfill saturated Water presure P259 AN 412AN AB is the wall considered P488I AN Figure Ex. 11.2

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Unit Conversion

Standard units are also called SI units. SI units are used for measuring a physical quantity satisfying certain conditions. There are two types of units: fundamental units and derived units. Fundamental units are physical quantities that are independent, that is, they do not depend on other quantities like mass, length, or time. There are plenty of quantities in our lives which need to be measured and compared. Measuring is the comparison of a particular physical quantity with its reference value. A unit is a measure of a fixed physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.