โ Scribed by Alsayed, M.I
No coin nor oath required. For personal study only.
Specimens in the form of hollow cylinders are versatile tools which can be used in many applications ranging from simulating stress conditions around underground openings to studying the behaviour of geomaterials under a wide variety of stress paths. Nevertheless, they remain little utilised in experimental studies due to the lack of suitable testing facilities and the difficulties involved in developing such facilities. This work presents a simple and practical solution for hollow cylinder test apparatus devised by combining a widely used and readily available conventional triaxial cell, developed by Hoek and Franklin (Trans. Inst. Min. Metall. 77 (1968) A22 (Section A)), and specially designed internal pressure loading configuration. In order to verify the performance of the new apparatus and demonstrate its versatility, various tests have been carried out on specimens of Springwell sandstone under uniaxial, biaxial, triaxial and polyaxial compression as well as indirect tension. The results obtained confirm the effect of the intermediate principal stress on rock failure and show that the apparent strength of rock is markedly influenced by the stress conditions imposed. It is aimed that the introduction of such simple apparatus would contribute to establishing common multiaxial testing systems that can provide more realistic predictions of the actual behaviour of rock and guide the formulation of more adequate numerical models.
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