Comparative Use of Shotcrete, Fibrecrete and Thin, Spray-On Polymer Liners for Blast Damage Mitigation

CIM Montreal 2003
Takis Katsabanis , , , , , ,
Abstract A research effort has been undertaken, under
WSIB sponsorship, to characterize the support
capabilities of conventional and innovative
spray-on lining materials for mitigating
dynamic failure effects created by simulated
rockbursts. Conventional spray support
media, such as shotcrete and fibrecrete
linings, and a variety of new spray-on lining
materials (TSL’s), typically polymer-type thin
coatings, were subjected to simulated
rockburst influence. For baseline comparison,
conventional rockbolt and bolt-and-mesh
support products were also evaluated.
Observation of lining performance was
undertaken through completion of field scale
support and rock detonation trials. Controlled
blasting tests were conducted at the Queen’s
University Explosives Laboratory to examine
the effectiveness of the variety of surface
coating agents for modifying dynamic rock
spalling processes. All tests were performed
upon largely undisturbed and homogeneous
rock materials in highly repeatable fashion.
Both conventional and innovative TSL-type
surface lining materials were subjected to
repeated “rockburst” exposure in
rigorously-controlled blast trials. All blasts
were observed seismically and
photographically to provide detailed
information concerning rock motion, surface
fracturing, ejected fragment motion and
support liner survivability characteristics.
These material comparison trials were
performed to assess the relative effectiveness
of a wide range of currently-available area
support techniques for suppressing hazards
associated with dynamic rock ejection. The
results of this study validates that thin,
spray-on linings may be equally as effective,
and often better, than conventional support
materials at mitigating rockburst or like
damage in highly stressed mine
environments.



Keywords: Conventional, Rockbursting, mitigation, Support, Linings, Underground, Dynamic, Damage, spray-on
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