Sabah S.Razouki - Formerly Department of Civil Engineering. Al-Nahrain University, Baghdad, Iraq
Nazar S.Rahseed - Baghdad, Irag

This paper presents a study of the two-dimensional consolidation of a homogeneous clay layer subjected to time-dependent uniform strip loading. The solution was developed for the case of Impermeable Footing and Impermeable Bottom of the clay layer, for both the isotropic and cross-anisotropic cases of permeability using the Alternating Direction Implicit technique. Design charts for the average degree of consolidation for different relative layer thicknesses namely۱,۲,۵ and ۱۰ were produced. For each relative layer thickness, charts were obtained for various construction time factors of Tc = ۰.۰, ۰.۱, ۰.۲, ۰.۵,۱, ۲, ۵ and ۱۰. The design charts were devoted to four permeability ratios, namely ۱,۵,۱۰ and ۲۵.The paper reveals that the effect of anisotropy on the average degree of consolidation at the end of construction period, is more pronounced during shorter construction periods than during long ones. The time factor for ۵۰% consolidation decreases with increasing cross-anisotropic permeability and relative layer thickness.

Anisotropic permeability, consolidation under time dependent loading, strip footing, two-dimensional consolidation, Terzaghi-Rendulic consolidation