Failure analysis of thin spray-on liner coated rock cores

Thin spray-on liners (TSLs) are surface support materials used in mining and civil engineering projects since 1990s with a wide ranging area of application from bolt/mesh support replacement to pillar reinforcement systems. This study presents the investigation of pillar reinforcement capacity of the TSL coated andesite rock core by compression test to mimic pillar reinforcement effect. The uniaxial compressive strength (UCS), modulus of elasticity (E), and energy absorbance capacity of uncoated and 5 mm coated cores having 25, 55, 75, and 100 mm diameters were compared. It was observed that there was no significant improvement in strength or stiffness for the homogenous rock cores coated with < 20% (TSL thickness to core diameter ratio) coverage. The main reinforcement contribution of the TSL was observed on post-failure region of the compression tests. Coated samples had higher energy absorbance (toughness) values than uncoated ones while the coverage of the TSL was increased, toughness enhancement also increased. Therefore, pillar reinforcement capacity of a TSL is a function of both pillar diameter and the TSL thickness. A new equation was found between energy absorbance gain for a given core dimeter and the coated TSL thickness. Researches or design engineers can use this equation as a guide to quantify the energy absorbance gain for a given pillar dimension and TSL thickness. It was found that the common on-site TSL practice of application of a fixed thickness (3-5 mm) for a given diameter does not contribute the toughness enhancement or pillar reinforcement.


Erkayaoğlu, Mustafa; Kırmacı, Alper (2019-09-01)
Rock bolts are widely used in tunnels, underground openings, and also rock slopes to provide support and attach blocks to therock mass in various engineering fields. They have a significant role for the stability of underground structures and natural rock slopes bothin the mining and civil engineering industry. The understanding of the rock bolt behavior under stress conditions plays a key role in the longterm stability and sustainability of rock slopes, nearby structures, and underground openings. The dete...
Operation Quality Indicators for Shovel-Truck Systems at Open-Pit Coal Mines
Voronov, Anton; Voronov, Yuri; Voronov, Artyom; Demirel, Nuray (EDP Sciences; 2019-01-01)
Stripping and mining operations at open-pit coal mines are performed mainly by heavy shovel-truck systems (STS). One of the main problems of the STS is a rather low level of its operation quality, an objective assessment of which is an important step in identifying the causes of low quality and effective ways to improve it. The purpose of assessing the STS operation quality is defined as a functional criterion. The next important step of the assessment is to choose the set of indicators that most characteri...
Parameter optimization of steel fiber reinforced high strength concrete by statistical design and analysis of experiments
Ayan, Elif; Saatçioğlu, Ömer; Department of Industrial Engineering (2004)
This thesis illustrates parameter optimization of compressive strength, flexural strength and impact resistance of steel fiber reinforced high strength concrete (SFRHSC) by statistical design and analysis of experiments. Among several factors affecting the compressive strength, flexural strength and impact resistance of SFRHSC, five parameters that maximize all of the responses have been chosen as the most important ones as age of testing, binder type, binder amount, curing type and steel fiber volume fract...
Optimum topological design of geometrically nonlinear single layer latticed domes using coupled genetic algorithm
Saka, M. P. (2007-11-01)
Single layer latticed domes are lightweight and elegant structures that provide cost-effective solutions to cover the large areas without intermediate supports. The topological design of these structures present difficulty due to the fact that the number of joints and members as well as the height of the dome keeps on changing during the design process. This makes it necessary to automate the numbering of joints and members and the computation of the coordinates of joints in the dome. On the other hand the ...
Replication of geomembrane interfaces using 3d printing (fused deposition modelling) technique
Uragan, Semkan; Huvaj Sarıhan, Nejan; Department of Civil Engineering (2020-12-22)
Geomembrane – soil interface is a critical consideration in geotechnical engineering applications such as liners and covers in landfills, canals or mine tailing dams. In some cases, lack of sufficient shear strength in these interfaces leads to poor performance, uneconomical design (such as requiring a longer geomembrane in an anchor trench), or may even lead to failure. To eliminate such problems, geometrical features known as asperities (or protrusions) are used on the geomembrane's interfacing faces. The...
Citation Formats
H. Öztürk, “Failure analysis of thin spray-on liner coated rock cores,” ENGINEERING FAILURE ANALYSIS, pp. 25–33, 2017, Accessed: 00, 2020. [Online]. Available: