Laboratory and distinct element analysis of the deformability behaviour of thin spray-on liners

Thin spray on liners (TSL) are polymeric or cement-based products that have been used for underground rock support extensively. Although linear–elastic behaviour assumptions have been attempted during numerical modelling of TSLs by researchers, TSLs do not obey this behaviour in reality. The effect of curing time on the elastic material properties (Young's modulus, Poisson's ratio) and the compressive strength of flexible and rigid liners were studied. During the laboratory studies, samples from two different TSLs (flexible and relatively rigid) prepared in laboratory conditions with different curing times (2, 7, 14, 21 and 28 days) were tested based on the ASTM standards. It is concluded that an increase in curing time improves the compressive strength and modulus of the TSLs but decreases their deformation behaviours. The relationship between Young's modulus, the curing time and uniaxial compressive strength (UCS), and the curing time can be expressed with an exponential trend line for the rigid liner and a logarithmic trend line for the flexible liner, respectively. TSLs have no definitive constitutive behaviour revealed so far. In this study, distinct element modelling of TSLs on UCS test specimens were performed to be able to capture their true constitutive stress-strain behaviour under compression. Deformation behaviours of laboratory test specimens were simulated in a DEM code, PFC2D. Finally, a new scaling coefficient between macro and micro properties of PFC for deformability testing is calculated in order to decrease the laborious calibration process that one must go through in PFC modelling. If the strength and modulus of laboratory results of TSLs are known, their micro properties can be calculated using the presented scaling coefficient given in this study.
International Journal of Rock Mechanics and Mining Sciences


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...
The dissolution of ilmenite in HClH2O, HClCH3OH and HClC2H5OH systems — A theoretical approach
Türker, Lemi; Goodall, David; Girgin, İsmail (Elsevier BV, 1988-11)
Silicon powders are obtained by laser pyrolysis of silane gas. Temperature and velocity profiles are determined both theoretically and experimentally. The velocimetry consists of a marker technique which measures the propagation time of a perturbation front through the hot reaction zone. In the theoretical model, the coaxial jet expansion undergoing a thermal heating is studied by defining a Dorodnitzin-Illingworth transformation. The results show a decrease of axial velocity as the gas enters the laser hea...
Using foam in horizontal well drilling: A cuttings transport modeling approach
Ozbayoglu, ME; Miska, SZ; Reed, T; Takach, N (Elsevier BV, 2005-04-30)
Foam is a frequently used compressible fluid in drilling applications. Cuttings transport with foam has been a focus of interest for years. Few studies have been conducted on vertical well configuration and successfully applied. However, less is known about the performance of foam in highly inclined and horizontal wells. In this study, a layered model is developed for describing cuttings transport in horizontal wells. Due to the presence of a cuttings bed, generalized rheological model parameters for foam a...
A New Isotropic Specimen Preparation Method from Slurry for both Saturated and Unsaturated Triaxial Testing of a Low-Plasticity Silt
Ahmadi-Naghadeh, Reza; Toker, Nabi Kartal (ASTM International, 2019-07-01)
A new procedure for the preparation of low-plasticity silt specimens that are isotropically reconstituted from slurry is developed for use in both saturated and unsaturated soil testing. Spatial variations of the water content and grain size distribution were examined to confirm the uniformity of the specimens (regarding void radio and segregation). The new preparation method results in a homogeneous specimen, which has a simple stress history. The repeatability of the proposed method in preparing identical...
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
H. Öztürk, “Laboratory and distinct element analysis of the deformability behaviour of thin spray-on liners,” International Journal of Rock Mechanics and Mining Sciences, pp. 0–0, 2019, Accessed: 00, 2020. [Online]. Available: