THEORIES OF SEEPAGE INTO AUGER HOLES IN HOMOGENEOUS ANISOTROPIC SOIL

Steady-state theories have been developed for flow into an auger hole in a homogeneous and anisotropic soil medium when (i) there is an impe rmeable layer at the bottom of the auger hole and (ii) there is an imp ermeable barrier at a finite distance below the bottom of the auger ho le. The proposed theories can be modified easily for an isotropic Soil condition and the partially penetrating auger hole theory presented h ere is simpler than the existing theories (Kirkham, 1958; Boast and Ki rkham, 1971) for the same soil condition. Furthermore, the theories ca n be applied directly, i.e. without transformation of coordinate axes, to determine the directional conductivities of an anisotropic medium (and hence also the hydraulic conductivity of an isotropic medium sinc e ah anisotropic medium can be transformed into an isotropic one simpl y by treating the horizontal hydraulic conductivity of the medium as e qual to its vertical hydraulic conductivity) from auger hole experimen tal data below a water table.