Elasto-Plastic Damage and Dilation Analysis of Fibre-Reinforced Thin Spray-on Liner Coated Concrete and Coal Specimens under Compressive Loading
Publication Name
57th US Rock Mechanics/Geomechanics Symposium
Abstract
Skin support provides resistance to the shearing and spalling of exposed rock layers/blocks, as well as protecting t surface from open atmospheric contact. Thin spray-on liner (TSL) is one such skin support that can be applied to the roof or sidewal of an excavation to enhance load-deformability behaviour. The failure behaviour of concrete and coal blocks when coated with a th layer of polymeric liner was studied experimentally and numerically. The experimental results show a distinct "slight strain-softeni zone" in the stress-strain curves of cubical concrete and coal samples when coated with a 5 mm thick polymeric liner. A micro-pla based coupled-damage-plasticity material model with the Drucker-Prager yield criterion is also implemented for determining t damage and dilation behaviour in the concrete and coal samples with and without liner. The results show that liner application reduc the magnitude of damage by nearly 23% in both concrete and coal blocks. On the other hand, the dilation angle increases rapidly its peak value with an increase in plastic shear strain (γp).
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