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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 15
Edited by: B.H.V. Topping
Paper IV.3

A Computer Control System for Stress Path Triaxial Testing

D.G. Toll

Geotechnical Systems Group, School of Engineering and Computer Science, University of Durham, Durham, England

Full Bibliographic Reference for this paper
D.G. Toll, "A Computer Control System for Stress Path Triaxial Testing", in B.H.V. Topping, (Editor), "Developments in Civil & Construction Engineering Computing", Civil-Comp Press, Edinburgh, UK, pp 107-113, 1993. doi:10.4203/ccp.15.4.3
A computer control system (TRIAX) has been developed for controlling stress path triaxial tests performed using a Bishop and Wesley triaxial cell. It runs on an IBM compatible PC and provides data acquisition and calibration facilities and can control up to twelve stepper motor driven controllers. TRIAX calculates a suite of variables appropriate to triaxial testing. The variables can be accessed by the user for plotting and control. A very flexible control philosophy has been adopted in which the user specifies control parameters in the form of equations. The system can deal with a test which comprises up to 100 different stages. Control is passed from stage to stage by a series of alarms; these are user defined conditional equations which trigger a number of different actions. The flexibility of the system is demonstrated by presenting three alternative ways in which a K0, stress path (zero radial strain) can be followed. The best method of maintaining K0, is identified.

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