B-17 FIELD INVESTIGATION OF WEAK SOILS USING ELECTRICAL RESISTIVITY METHOD 1 MAHMOUD. M. MANSOUR and AWAD M.KASSEM Assiut University Mining Engineering Department Faculty of Engineering Assiut Egypt Abstract Deposits of the weak compressible soil are widespread and they present very special problem of engineering design and construction. In this kind of soils foundation failures are comparatively common and surface loading due to structures inevitably results in large settlement. Site investigations can for practical and economic reasons only cover very small portion of the total soil mass. So the target of the present study is to extend the obtained borings data