Development Status of Thin, Spray-on Liners for Mining and Civil Engineering Applications

CIM Vancouver 2006
Philip A. Dirige,
Abstract Research has been conducted for the Workplace
Safety and Insurance Board of Ontario (WSIB) in
order to characterize thin, spray-on lining
materials (TSLs), as well as combinations of TSLs
and conventional spray supports, and to assess
their capacity for inhibiting damage created by
mining-induced rockbursts. This study has been
performed to assess the capabilities of such
support systems for preventing rock and support
material damage that often results due to
rockbursting. A variety of TSLs and other spray
support media were subjected to the effects of
simulated rockbursting, through use of explosive
detonation trials, to evaluate their damage
mitigation capacity. Results of this study have
validated that thin, spray-on linings (TSLs) and
variant layer combinations may be as effective as
or better than conventional support materials for
mitigating rockburst or like damage in highly
stressed mine environments.

In civil engineering construction, and typically
in underground tunneling operations where
concrete linings are applied, liner deterioration
is a continuing and pervasive problem that often
requires expensive and time-consuming
rehabilitation effort. The ability of TSLs to
provide effective concrete structural
reinforcement while providing sustainable
resistance against underground or restricted
environmental hazards, as with fires or dynamic
failure events, may permit wider use of such
products than is currently foreseen by the mining
industry. Significant benefits for use of TSL
materials in concrete liner rehabilitation and
for concrete material protection have been
assessed and will be presented.
Keywords: thin, Rock, Support, Tunnels, mitigation, Rockbursts, Damage, spray-on, Linings, Rehabilitation
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