This document summarizes the results of a study on thin spray liners (TSLs) with fiber reinforcements used for rock support in mining and tunneling. Tests were conducted over various curing periods (1, 7, 14, 28 days) to determine the shear bond strength, tensile bond strength, tensile strength, and shear strength of an Oxyliner TSL with glass and polypropylene fibers. The results showed the reinforced TSL had strong shear and tensile strengths that increased with curing time. A comparison found the reinforced TSL provided greater benefits than shotcrete in terms of strength behavior, cost, equipment needs, and application thickness, suggesting TSLs can be a viable alternative to shot

1. AverageTensile Bond Strength = 0,88 Mpa
Strength Class = Medium
Average Shear Bond Strength = 3,47 Mpa
Strength Class = Strong
Average Shear Strength = 8,16 Mpa
Strength Class = Strong
AverageTensile Strength = 2,91 Mpa
Strength Class = Medium
THIN SPRAY LINER WITH FIBRE REINFORCEMENTS
AUTHOR: RAEES BAGDADI
SUPERVISOR: MR PIERRE VAN TONDER
DESCRIPTION
• AIM
Thin spray liners are utilized within the mining
and tunnelling industry in order to provide
stability and rock support to the exposed rock
mass interfaces for the purpose of preventing
collapsing of the rock mass.
• METHOD
The objective is to determine the mechanical
properties of a standard Oxyliner TSL with the
addition of glass and polypropylene fibre
reinforcements in order to determine whether
TSLs can become a viable alternative to shotcrete.
• RESULTS
Four test procedures were conducted for the four
various curing periods ( 1,7,14,28 days ) in order to
assess the mechanical properties of the Oxyliner
TSL with reinforcements which consisted of the
Shear Strength , Shear Bond Strength, Tensile
Strength and Tensile Bond Strength. A Norite rock
is utilized in order to determine the bond strength
between theTSL and the rock substrate.
• CONCLUSION
After conducting the experimental procedures for the
various tests, a load vs. extension graph is obtained for
the specimens whereby the strength gain can be
established for the various curing periods. The strength
of the Oxyliner with reinforcements increases over the
various curing periods until a maximum strength is
reached. The strength is determined by the amount of
stress that theTSL can withstand.
From a comparison between shotcrete and the
Oxyliner with fibre reinforcements conducted, the
Oxyliner with fibre reinforcements provides greater
benefits to that of shotcrete in terms of the strength
behaviour, Cost, Versatility of Equipment required as
well as the thickness of application required.
Therefore the use of TSLs within the mining and
tunnelling industry can indeed be a viable alternative
to shotcrete.
Shear Bond Strength
Tensile Bond StrengthTensile Strength
Shear Strength