Creep behaviour investigation of a thin spray-on liner

Güner, Doğukan
Öztürk, Hasan
Thin spray-on liner (TSL) is a fast-setting multi component polymeric material applied on a rock surface with a thickness of 2-5 mm. TSLs are primarily used as an areal support element in a support system that also incorporates rock bolts. Different laboratory and field tests were performed to understand the support performance of the TSL for underground design. The research described in this paper presents laboratory studies of the tensile creep behaviour of a cement based TSL for the first time in the literature. For this purpose, "dogbone" tensile/ tensile creep test samples were prepared under laboratory conditions with different curing times (1, 7, and 14 days) and were tested under 23 +/- 2 degrees C laboratory conditions according to the ASTM standards. A range of dead weights (80%, 60%, 40%, and 20% of the tensile strength) was applied until the rupture of the specimens. The time-dependent behaviour of a TSL was presented for different constant load and curing time conditions. Moreover, creep rupture envelopes were constructed to estimate the tensile failure time of the TSL for a given loading condition. If the tensile stress acting on the TSL is known, the effective permanent support time of the TSL can be estimated by the derived equations. It was observed that during the creep tests, if TSL is sustained under more than 60% of its ultimate tensile strength, it fails within 24 h. The tested TSL is highly sensitive to creep deformation and design engineers should be aware that creep might cause serious problems in the application of TSLs. As a practical guide, it is proposed that for the 7 day or older aged TSLs, 15-20% of the tensile strength and for 1-day or younger aged TSLs, 30-35% of the tensile strength should be taken as a tensile strength design parameter.


Experimental and modelling study on nonlinear time-dependent behaviour of thin spray-on liner
Güner, Doğukan; Öztürk, Hasan (Elsevier BV, 2019-02-01)
Thin spray-on liners (TSLs) are fast-setting multi component polymeric materials applied on rock or coal surface with a thickness of 2-5 mm that have fairly high tensile strength, adhesion, and elongation capabilities. Compared to conventional surface support elements, TSLs with polymer content exhibit different material responses over time. As a matter of fact, the creep behaviour of TSLs under a constant load has a significance for the evaluation of the long term performances of TSLs. This paper investiga...
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Gundogar, A. S.; Ross, C. M.; Akın, Serhat; Kovscek, A. R. (Elsevier BV, 2016-10-01)
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Soil-water characteristic curve (SWCC) is widely used for obtaining mechanical and hydraulic properties of unsaturated soils, such as shear strength, deformation, permeability, and flow. An innovative approach, where a meso-scale medium is generated based on particle size distribution and void ratio of non-plastic soils, for estimating the drying SWCC is developed. With application of the finite difference and Newton-Raphson (Jacobian) approximations, the air-entry pressures of pore bodies in inter-particle...
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Thin spray-on liner adhesive strength test method and effect of liner thickness on adhesion
Öztürk, Hasan (Elsevier BV, 2010-07-01)
The adhesive strength between a thin spray-onliner(TSL) and rock is an important property controlling the designandperformanceofTSLrocksupportsystems. The advantages and disadvantages of various adhesion test methods used by the coatings, microelectronics and concrete industries with respect to TSLs are discussed. A suggested test method for TSL materials is presented, which is based on direct pull-off of an elevator bolt that is attached to a liner with strong epoxy. To interpret the test results correctly...
Citation Formats
D. Güner and H. Öztürk, “Creep behaviour investigation of a thin spray-on liner,” INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES, pp. 58–66, 2018, Accessed: 00, 2020. [Online]. Available: