METHOD FOR USE IN ASSESSING THE PHYSICAL STATE OF GROUND MATERIALS AND APPARATUS FOR USE THEREIN

摘要

Apparatus for assessing the physical state of a ground site has electrode assemblies (10) positioned in the site to be assessed, each comprising an electrode (12) and selector means (14) and at least one multiway cable (16) connecting a plurality of electrode assemblies (10) to a central processing unit (18). Lines of the cables (16) are connected to the unit (18) to provide control signal to the selector means (14) and further lines of the cable are connected to a current source (28) and voltage detection means (30, 32, 26). Each selector means (14) is actuated by a control signal from the unit (18) to connect the associated electrode (12) with a selected one of lines (C1, C2, P1, P2) to a current source (28) or voltage detector (30).