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Improvement of Strength-Deformability Behaviour of Rock-Like Materials and Coal Using Fibre-Reinforced Thin Spray-on Liner (FR-TSL)

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Abstract

Thin Spray-on Liner (TSL) is a new class of skin support which can be applied to the roof or sidewalls of an excavation for enhancing load-deformability behaviour. In this study, fibreglass-reinforced TSL (FR-TSL) was coated around the surface of samples made of rock-like materials and coal to compare the compressive and tensile behaviours with those of unlined samples. It was found that 5-mm FR-TSL could enhance the tensile strength of hydrostone by four times and change the failure mode from tensile to shear. A distinct “slight strain-softening zone” was observed in the stress–strain curves of cubical concrete and coal samples when coated with FR-TSL. The dissipated energy density and its rate were also higher in the post-yield regime, indicating effective confinement by the liner. The paper describes the experimental procedures and results in terms of deformability characteristics, elastic strain energy, and dissipated energy with and without the liner. The efficiency of liner performance is also quantified for its potential use in field applications.

Highlights

  • Load-deformation behaviour of rock-like material and coal by coating fibreglass reinforced TSL (FR-TSL) is studied experimentally.

  • The load-carrying capabilities of FR-TSL reinforced hydrostone beam samples increases, and failure mode changes from tensile (without liner) to shear.

  • FR-TSL coated coal, and concrete blocks exhibit higher peak strength and slight strain-softening after peak till the liner tears.

  • The rate of energy dissipation in lined samples is higher as compared to unlined concrete and coal samples.

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Authors and Affiliations

  1. Department of Mining Engineering, Indian Institute of Technology Kharagpur, Kharagpur, India

    Gopi Krishna Dondapati & Debasis Deb

  2. School of Civil, Mining and Environmental Engineering, Faculty of Engineering and Information Sciences, University of Wollongong, Wollongong, Australia

    Gopi Krishna Dondapati, Ian Porter & Shivakumar Karekal

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  1. Gopi Krishna Dondapati
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  2. Debasis Deb
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  3. Ian Porter
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  4. Shivakumar Karekal
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Correspondence to Debasis Deb.

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Dondapati, G.K., Deb, D., Porter, I. et al. Improvement of Strength-Deformability Behaviour of Rock-Like Materials and Coal Using Fibre-Reinforced Thin Spray-on Liner (FR-TSL). Rock Mech Rock Eng 55, 3997–4013 (2022). https://doi.org/10.1007/s00603-022-02825-8

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