Creep Behaviour of a Polymer-based Underground Support Liner

Güner, Doğukan
Öztürk, Hasan
All underground excavations (tunnels, mines, caverns, etc.) need a form of support to ensure that excavations remain safe and stable for the designed service lifetime. In the last decade, a new support material, thin spray-on liner (TSL) has started to take place of traditional underground surface supports of bolts and shotcrete. TSLs are generally cement, latex, polymer-based and also reactive or non-reactive, multi-component materials applied to the rock surface with a layer of few millimeter thickness. They have the advantages of low volume, logistics, rapid application and low operating cost. The majority of current TSLs are two-part products that are mixed on site before spraying onto excavation rock surfaces. Contrary to the traditional brittle supports, the high plastic behaviour of TSLs make them to distribute the loads on larger lining area. In literature, there is a very limited information exist on the creep behavior of TSLs. In this study, the creep behavior of a polymer-based TSL was investigated. For this purpose, 7-day cured dogbone TSL specimens were tested under room temperature and humidity conditions according to ASTM-D2990 creep testing standard. A range of dead weights (80, 60, 40, and 20 % of the tensile strength) were applied up to 1500 hours. As a result of this study, the time-dependent strain behavior of a TSL was presented for different constant load conditions. Moreover, a new equation was derived to estimate 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 proposed relationship., Polymer-based liner, TSL, Creep, Membrane, Support


Creep behaviour analysis of thin spray-on liners
Güner, Doğukan; Öztürk, Hasan; Department of Mining Engineering (2020)
Thin Spray-on Liner (TSL) is a relatively thin (2–5 mm) and fast-setting liner material used by spraying onto rock surfaces to support underground excavations. Areal support materials that are sprayed onto the rock, such as shotcrete or liners, are able to generate support resistance at small rock deformations and can prevent underground rockfalls from happening in the first place. However, where large ground convergence occurs, the more flexible TSLs may provide superior support over the full range of rock...
Implementation of software GPS receiver
Günaydın, Ezgi; Tuncer, Temel Engin; Department of Electrical and Electronics Engineering (2005)
A software GPS receiver is a functional GPS receiver in software. It has several advantages compared to its hardware counterparts. For instance, improvements in receiver architecture as well as GPS system structure can be easily adapted to it. Furthermore, interaction between nearby sensors can be coordinated easily. In this thesis, a SGR (software GPS receiver) is presented from a practical point of view. Major components of the SGR are implemented in Matlab environment. Furthermore, some alternative algor...
Constructing and deconstructing chivalric romance and modern fantasy literature
Çankaya, Tuğçe; Alpakın Martınez Caro, Dürrin; Department of English Literature (2015)
Although generic, psychoanalytic and postcolonial approaches differ in nature, each of them might be helpful in revealing the strong affinity between chivalric romance and modern fantasy. In the light of generic analysis of these two genres, it is apparent that modern fantasy is the generic revival of the chivalric romance. Among these generic features, the quest motif, adventures to the other worlds, imaginary characters/settings and the battle between light and darkness, circular plot pattern and anachron...
Status of the VERITAS Observatory
Holder, J.; Acciari, V. A.; Aliu, E.; Arlen, T.; Beilicke, M.; Benbow, W.; Bradbury, S. M.; Buckley, J. H.; Bugaev, V.; Butt, Y.; Byrum, K. L.; Cannon, A.; Celik, O.; Cesarini, A.; Ciupik, L.; Chow, Y. C. K.; Cogan, P.; Colin, P.; Cui, W.; (2009-01-01)
VERITAS, an Imaging Atmospheric Cherenkov Telescope (IACT) system for gammma-ray astronomy in the GeV-TeV range, has recently completed its first season of observations with a full array of four telescopes. A number of astrophysical gamma-ray sources have been detected, both galactic and extragalactic, including sources previously unknown at TeV energies. We describe the status of the array and some highlight results, and assess the technical performance, sensitivity and shower reconstruction capabilities.
Othering and Hybridity in Joseph Conrad's Almayer's Folly
Turasan Çiğdem, Ferruh; Sönmez, Margaret Jeanne M.; Department of English Literature (2013)
This thesis studies Joseph Conrad’s Almayer’s Folly in terms of two theoretical concepts; othering and hybridity. The first theoretical concept, othering, is analysed from various perspectives for three main reasons: 1) The question of “Who is other to whom?” cannot be answered thoroughly because there is a continuous power struggle between the European and the non-European characters. 2) The theme of othering in the novel is based on a view of humanity and its conflicts that is radically ambivalent, and th...
Citation Formats
D. Güner and H. Öztürk, “Creep Behaviour of a Polymer-based Underground Support Liner,” 2017, vol. 1884, Accessed: 00, 2020. [Online]. Available: