Investigation of Load Bearing Capacities of Grouted Rock Bolts with New Auxetic Head Designs

Komurlu, Eren; Demir, Aysegul Durmus; Çelik, Atila Gürhan

doi:10.3311/ppci.16366

Cited by 6 publications

(3 citation statements)

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“…Load bearing capacity is not a sufficient parameter in rock bolting designs. Also, the energy absorption capacity parameter should be considered for the performance of rock bolts [32][33][34][35].…”

Section: Discussionmentioning

confidence: 99%

Investigation of New Energy Absorbing Mechanisms Used to Fix Rock Bolt Plates

Komurlu

2023

Period. Polytech. Civil Eng.

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In this study, different plate fixing designs were tested in order to improve rock bolting performances. Instead of commonly used steel nuts, different plate fixing designs were investigated by both laboratory and site studies. In addition, the usability of nuts and energy absorbers made of the polyamide type engineering polymer was investigated to assess whether they are advantageous for the aim of supplying high-energy absorbing features. In this experimental study, deformation-controlled load tests were carried out to evaluate the bearing and energy absorption capacities of totally eight different groups of specimens. According to the findings from this study, use of the polyamide material with steel nuts as an energy absorber material, rather than using instead of steel nuts supplies good results. As another outcome, it has been determined that use of proper washers between steel nuts and polyamide absorbers can significantly improve the energy absorption performances. It has been evaluated that the energy absorption capacity of the bolt plates can be economically increased up to 10 times by using suitable polyamide energy absorbers placed between the plate and steel nut parts. It was concluded that the polyamides can be used to remarkably improve the rock bolting performances especially in the rock masses where the high energy absorption capacity property is needed, like those with rock bursting, squeezing and swelling problems.

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Section: Discussionmentioning

confidence: 99%

Investigation of New Energy Absorbing Mechanisms Used to Fix Rock Bolt Plates

Komurlu

2023

Period. Polytech. Civil Eng.

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“…In the grout mix, the water to cement ratio was 0.45 by weight. In rock bolting, typical water to cement ratios of grout mixes vary between 0.35 and 0.45 by weight [14][15][16][17]. There were five different grout mix groups with no polymer, 3.5% and 7.0% polymer (SMS and MS Polymer) additives by weight.…”

Section: Methodsmentioning

confidence: 99%

An Investigation of Using Thermoset Polymer Type Liquid Additives to Improve Cement Grout Performances in Rock Bolting Applications

Komurlu

2020

Int. J. of Geosynth. and Ground Eng.

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Effect of thermoset type polymeric additives on load-bearing capacities of grouted rock bolts was investigated with both laboratory and site studies. For the specimen preparation, two different silicone-based polymeric materials were added with different amounts in the cement and water mixes. Additionally, cement grouts without the polymeric additive were also used to compare results obtained from different grout usage cases. The additives are in the liquid phase while adding into the fresh cement mix and start to solidify due to the polymerization after being mixed in the grout material. Support performances of various grouted rock bolt specimens were tested under axial and shear loading conditions. According to the results of this study, use of the polymeric additives with an amount of 3.5% by weight in total mix significantly improves the ductility in support reactions of grouted bolts and increases the energy absorption capacity by high rates over 50%.

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“…Due to the advantages of easy disassembly and reliable connection, bolts are usually used in vehicles, ships, and various important equipment. Extensive research on bolts has been carried out in recent years, such as dynamic analysis, finite element modeling, effects of environmental and material parameters, and optimal design of structures [1][2][3][4]. Among these bolted connection applications, flanges have attracted much attention since the complex contact surfaces and a large number of bolts have brought challenges to research [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Bolt looseness localization with connection-stiffness-varying flange

Huang,

2024

Smart Mater. Struct.

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Electromechanical impedance analysis is a traditional method to identify the occurrence of bolt looseness, but accurate localization of blot looseness is hard to realize on the flange. In this study, a flange model with bolt connection stiffness varying with position is proposed. The location of bolt looseness can be then determined from the impedance spectrum of the model since the uniformity and symmetry of the flange are broken. The analytic model is established to reveal the distinguishability of the eigenfrequency shifting characteristics when the connection stiffness at different positions changes. The frequency shifting sequence is extracted from the coupling impedance spectrum as a feature, and the correlation between the sequences corresponding to bolt looseness at different positions is low. The relationship between the sequence and the degree of looseness is highly related so that the unknown degree of looseness can be matched with the calibrated sequence to realize the localization of the looseness. Based on the distinguishability of the frequency shifting sequence, the connection-stiffness-varying model shows great potential in the field of flanges or other connecting structures for structural health monitoring and damage localization.

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Investigation of Load Bearing Capacities of Grouted Rock Bolts with New Auxetic Head Designs

Cited by 6 publications

References 0 publications

Investigation of New Energy Absorbing Mechanisms Used to Fix Rock Bolt Plates

Investigation of New Energy Absorbing Mechanisms Used to Fix Rock Bolt Plates

An Investigation of Using Thermoset Polymer Type Liquid Additives to Improve Cement Grout Performances in Rock Bolting Applications

Bolt looseness localization with connection-stiffness-varying flange

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