Creep behaviour investigation of a thin spray-on liner

Güner, Doğukan; Ozturk, H.

doi:10.1016/j.ijrmms.2018.05.007

Cited by 15 publications

(5 citation statements)

References 5 publications

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“…For the anchor rods (ropes) that penetrate into the inner part of the rock, a modified version of chlorinated polyethylene resin with rust remover is applied to the surface of the anchor rods (ropes) before installation to prevent them from rusting. is thin spray-on liner is based on TSBP/3.0 type inorganic material, which can resist corrosion and weathering by spraying the liner after mixing with water, its elasticity and ductility are good, its tensile strength is high, and it can adhere well to the sprayed surface [25][26][27][28]. e specific downhole construction process is shown in Figure 9.…”

Section: Thin Spray-on Liner Construction Processmentioning

confidence: 99%

Study on Antiweathering Support Technology of Thin Spray-On Liners in Shallowly Buried Coal Seam Roadway under Corrosion Condition

Zhang

Zhuo

Yang

et al. 2022

Shock and Vibration

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The thin spray-on liner is an inorganic polymer product that has been widely used to support mine perimeter rock roadways, but it is mainly used in metallic hard rock roadways with high rock strength and is less used in roadways affected by roadway corrosion and weathering in shallowly buried coal seams. Therefore, this study studies the thin spray-on liner support technology under such geological conditions. First, the causes of anchor support failure in this condition are analyzed, and it is concluded that alkaline ionized water corrodes the anchor rods, and chloride ions in the water play a role in accelerating the degree of anchor rod corrosion. Next, microscopic testing was used to determine the content of weathering and swelling minerals contained in the roof rock and the development of tectonic fissures. Third, the loosening circle of the surrounding rock is theoretically calculated and used as a basis to design the anchor mesh rope support parameters for the roadway. Finally, the construction process of a thin spray-on liner anticorrosion and antiweathering support technology is introduced. This technology improves the anchor force environment of anchor rods while incorporating anchor rods (ropes)—rock—metal mesh into the support system to play a coupling support role. On-site monitoring is performed to derive the optimum thickness of the spraying layer in different environments. At the same time, the deformation of the roadway surrounding rock and the anchor force can be improved to meet the requirements of anticorrosion and antiweathering and tighten the roadway surrounding rock. Compared with concrete support technology, the economic and environmental benefits of this support technology are apparent, and it helps to promote the application in shallowly buried coal seam mines.

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Section: Thin Spray-on Liner Construction Processmentioning

confidence: 99%

Study on Antiweathering Support Technology of Thin Spray-On Liners in Shallowly Buried Coal Seam Roadway under Corrosion Condition

Zhang

Zhuo

Yang

et al. 2022

Shock and Vibration

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“…In the next step, cement and fibers were mixed and scattered; after that, the liquid was poured and mixed [60]. Using a hand stirrer, the mixture was stirred clockwise and counterclockwise at low velocities [1]. After mixing for 3 min, the mixture was rapidly placed in a cuboid mould.…”

Section: Preparation Of Test Specimensmentioning

confidence: 99%

“…As early as in the 1990s, thin spray-on liners (hereinafter referred to as TSLs) have been first used in Canadian mines for sealing roadways [1], so as to prevent weathering of rocks in roadways and avoid accidents induced by rock falling [2][3][4][5]. e use of TSLs in the roadway is shown in Figure 1(a).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of a Polymer‐Modified Material for Thin Spray‐On Liners in Mine Roadways

Chen

Jiang

et al. 2020

Advances in Materials Science and Engineering

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In order to adapt to dry and wet environment in mine roadways and improve the performance of sealing materials under different environmental conditions, this study selected the materials based on their ability to spray and found that the materials with a viscosity of 1500–6000 MPa·s can achieve a balance between performance of spray and wall-hanging performance. Next, by selecting high-elastic polyacrylate emulsion and ordinary Portland cement as the film-forming agent and gel, respectively, mix proportion factors of the nonreactive thin spray-on liner (TSL) were analyzed by using the Taguchi method. Moreover, fluidity, setting time, sealing properties, compressive strength, bending strength, and bonding strength of those materials were measured. It was disclosed that addition of an appropriate amount of polyacrylate emulsion can enhance the effects of fibers. By observing the morphologies of the materials’ bonding surfaces and comparing the factors influencing bonding strength between both dry and wet walls, it was uncovered that the adhesive property of cement-based sealing materials was mainly affected by the water-cement ratio. Eventually, bonding strength and sealing properties were selected as primary optimization indexes, while setting time, bending strength, and compressive strength were selected as secondary optimization indexes. The appropriate proportions of two types of TSLs for dry and wet walls were (W/C = 50%; P/C = 6%; F/C = 1%; T/C = 0.2%) and (W/C = 45%; P/C = 6%; F/C = 1%; T/C = 0.4%), respectively. A prepared TSL can be used for filling rock fractures in mine roadways. In addition, TSL exhibited a great performance for dry and wet walls under different environmental conditions. The present study may provide an insightful guidance and reference for the investigation of TSL sealing materials applied in the mine roadways.

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“…Tensile strength tests were conducted by Yilmaz and 21 TSL products were categorized on the basis of tensile strength [6]. A practical guide of a cement-based TSL was provided after the tensile creep behavior of this TSL was investigated by Guner [7]. The tensile toughness of TSL has been proposed as a new performance criterion for TSL, and various TSL energy absorption capacity values were determined [1].…”

Section: Development Of Thin Spray-on Linersmentioning

confidence: 99%

Influence of Polypropylene Fiber on Tensile Property of a Cement-Polymer Based Thin Spray-On Liner

et al. 2019

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The influence of a polypropylene fiber on the tensile properties of a cement-polymer based thin spray-on liner (TSL) was investigated in this study. Two different contents of fiber were added to the liner, yielding two TSL groups. Tensile tests were performed (in accordance with the ASTM D638 standard) on the two groups of specimens as well as the control group at 1, 7, 14, and 28-day curing. The test result verified the large plasticity and low elastic modulus of the TSL compared with the fiber. SEM examination revealed that fibers lying parallel to the load direction ruptured or were pulled out from the matrix, which was beneficial to the tensile strength, but detrimental to the elongation because of their high stiffness. Other fibers lying perpendicular with the load direction were detrimental to both tensile strength and elongation through aggravating the propagation of the cracks. The tensile strength was improved by fiber incorporation, while the elongation was reduced at all curing. The influence of fibers on tensile toughness was uncertain since tensile toughness depended on strength as well as deformity.

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Creep behaviour investigation of a thin spray-on liner

Cited by 15 publications

References 5 publications

Study on Antiweathering Support Technology of Thin Spray-On Liners in Shallowly Buried Coal Seam Roadway under Corrosion Condition

Study on Antiweathering Support Technology of Thin Spray-On Liners in Shallowly Buried Coal Seam Roadway under Corrosion Condition

Synthesis and Properties of a Polymer‐Modified Material for Thin Spray‐On Liners in Mine Roadways

Influence of Polypropylene Fiber on Tensile Property of a Cement-Polymer Based Thin Spray-On Liner

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