A novel biaxial compression testing system
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Date
2009
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Abstract
In this paper, a novel biaxial loading apparatus developed for biaxial compressive and shear strength testing of rock material and rock mass specimens, is described. The suitability of the system is demonstrated by real time compression test results on aluminium and fractured glass plate specimens. The system is capable of applying biaxial compressive stresses uniformly to the side surfaces of the specimens even if the contact surfaces of the platen and the specimen is rough. Stress distribution within the test specimens were measured using strain gauges and photo-elastic transducers. Examine2D plane strain indirect boundary element software was used to classify the magnitude of stress levels of the fringes around symmetrical holes. The biaxial loading system incorporates polyurethane rubber seals, pressurized using two hydraulic pumps. Pressure from the seals is transmitted to the specimens using Teflon lined steel pads. The system can apply uniform biaxial compressive stresses up to 70 MPa, in both directions.