Abstract
This technical note describes a mechanical device, which has been designed and used in laboratory experiments, to measure deformations in rock salt under combined shear and tension loading. The device was designed for use with a servo-controlled hydraulic testing machine to test long cylindrical rock cores with specific dimensions. In the experimental programme, measured rock deformations were correlated with the response of coaxial cables embedded axially within cores; time domain reflectometry (TDR) techniques were used. Combined shear and tension loading tests were conducted, using two different ratios of shear to tension deformation. The combined shear and tension device is described, together with its operation and mechanics. Charts show the typical displacement responses of extension and shear deformation for tests conducted using the device's top and bottom pins, respectively. A mathematical appendix shows how to compute the shear load, using equations of static equilibrium and the device geometry. The use of the combined testing mechanism has been demonstrated, and the testing device could be applied to general rock mechanics testing, to measure small displacements occurring when a combined stress state is used.
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