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The solution of many foundations - engineering prob lems requires knowledge of the lateral pressure which may be exer ted by the earth or surcharge loads. The lateral earth pressure is a significant design parameter in many of the foundation engineering problems subjected to latera l pressures commonly used as parts of many civil engineering projects. S ome examples of these structures are, retaining walls, sheet-pile walls, both braced and unbraced excavations, trench excavations, grain pressures on silo walls, cofferdams, caissons, embedded shells and other types of underg round structures requiring an estimation of the lateral pressure fo r design or stability analysis. The different formulae such as Jaky , Hendron , Br ooker and Ireland, Vierzbiczky , Saglamer , Wenkow , Robert Szepesh azi , Matsuoka et al, Bolton , and others were used to determine the fact or Ko. The main aim of this research is to estimate the co efficient of earth pressure at rest equation depending on the theoreti cal relationship between the active, passive earth pressures and the lateral strain of soil. The important result from this research is: ) sin 1 /( ) sin 1 ( 2 2 φ φ + = o K

THEORETICAL STUDY OF EARTH PRESSURE AT – REST FOR SANDY SOILS