Abstract
This article presents a new large-diameter experimental device capable of applying multi-axial, out-of-plane loading to relatively large geosynthetic specimens (48 cm diameter). Although similar in concept to the types of apparatuses typically used for the established Multi-Axial Tension Test for Geosynthetics, this newly developed device is unique in that load is directly applied to the circular specimen using a rubber membrane, thus allowing pervious materials such as geotextiles to be tested. A key advantage of the device is that it mimics the in-service loading conditions of geosynthetics used in a range of design applications including the spanning of voids and pile supported embankments. Equations are presented to interpret the experimental data, with consideration of the presence of the bladder. Typical experimental results are presented along with a description of the failure process of select geotextile materials under multi-axial load.
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