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In load-deformation testing of soils it is generally necessary to supply both fluid pressures and direct loads (forces) on the sample boundaries. In addition, soils are tested under both controlled load and controlled deformation. Often three separate systems exist in a standard soils laboratory: gear driven presses, dead load hangers, and a regulated fluid pressure system. This paper describes a control system that employs commercially available rolling diaphragm cylinders and micro-flow needle control valves to supply simple and economical control for soils testing.
soil testing, control
Professor, Queen's University, Kingston, Ont.