Finite Element Analysis Of Modified Conebolt Under Static And Dynamic Loadings

Nguyen, B. Q.; Cai, Ming; Challagulla, K.S.

doi:10.25071/10315/35402

Cited by 2 publications

(2 citation statements)

References 10 publications

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“…Bolts with yielding sections formed from smooth bars are available on the market, similar to the Secura bolt (Cai, Champaigne, and Kaiser, 2010;Charette et al, 2014;Doucet and Voyzelle, 2012;Guntumadugu, 2013;Li, Stjern, and Myrvang, 2014;Ghorbani et al, 2020;Nguyen, Cai, and Challagulla, 2018;Raju, Mitri, and Thibodeau, 2011;Yokota et al, 2020), such as the cone bolt, D-bolt, Garford solid bolt, and others. This is why the experience gained during the dynamic testing of Secura bolts could be utilized for other types of threaded bolts that are subjected to dynamic loading by means of tensile axial force.…”

Section: Test Proceduresmentioning

confidence: 99%

Resistance of yielding rockbolts to multiple impact loads

Pytlik,

O'Connor,

Corbett

2024

J. S. Afr. Inst. Min. Metall.

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The resistance of yielding rockbolts to multiple impact loads was tested by means of a drop hammer. The methodology was based on the ASTM D7401-08 standard as well as the requirements specified for rockbolts by Luossavaara-Kiirunavaara Aktiebolag (LKAB - a Swedish mining company) and the Safety In Mines Research Advisory Committee of South Africa (project number GAP 423). During the tests, the loading force and bolt elongation were measured with a sampling frequency of fs = 19.2 kHz. In order to analyse the phenomena involved, the tests were recorded using two independent high-speed video cameras (600 and 1000 frames per second) and one thermal camera (128 frames per second). The tests demonstrated that all the samples transferred double the gravitational potential energy of Ep = 50.85 kJ from the impact load of mass m = 2825 kg and impact velocity of v = 6.0 m/s without failure. Damage to the bolt-resin contact in the upper anchoring zone of the bolt in the steel tube occurred after subsequent impacts. As a result, the macro-deformed bolt exhibits additional yield, and its operation following the shearing of the resin bond is similar to that of a 'cone bolt'. Only one test resulted in damage to the threaded bolt rod-nut coupling, during the fourth impact; however, no damage to the bolt-resin contact zone was observed.

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Section: Test Proceduresmentioning

confidence: 99%

Resistance of yielding rockbolts to multiple impact loads

Pytlik,

O'Connor,

Corbett

2024

J. S. Afr. Inst. Min. Metall.

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“…For initial models, the material properties were either measured through laboratory testing or obtained from the literature (Nguyen et al 2018) to best represent each model component. The three main components of concern were the encapsulate resin, SDA and the rockbolt.…”

Section: Materials Propertiesmentioning

confidence: 99%

Finite element analysis of the Superbolt under dynamic loading

Nguyen¹,

Cai²,

Challagulla³

2019

Proceedings of the Ninth International Symposium on Ground Support in Mining and Underground Construction

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As the depth of mining and underground construction increases, rock failure leading to seismic events and rockbursting is inevitable. Rockbursts can cause fatalities and/or injuries to workers, damage mine infrastructure and/or equipment and disrupt production. To minimise rockburst risk, design measures will be required. As an important line of defence, ground control support systems are used to prevent or minimise rockburst damage to excavations and enhance workplace safety. A new, patented dynamic rockbolt (the Superbolt) that integrates a reinforcement component (SDA) and a yielding component (paddle bolt) has been developed. The paddle bolt's shank can slide freely inside the SDA when the bolt is plastically stretched. If the epoxy resin is not properly mixed and the paddle anchor slides, the SDA acts as a secondary mechanical anchor and holds the paddle in place, allowing yielding of the paddle. This new technology allows a one-pass support system to be installed underground, which will result in significant saving in mining operations. In this paper, finite element models are developed to simulate the dynamic drop tests of the paddle Superbolt using Abaqus. The split-tube and continuous-tube drop tests are simulated, and the results from the numerical simulations are in reasonable agreement with the experimental results. A parametric study is performed based on various parameters (i.e. friction, geometry, material strength, etc.) to analyse the performance of the bolt. The results demonstrate that the quality of epoxy-resin mix, the strength and ductility of the bolt material and the corrugated pipe (SDA) influence the performance of the rockbolt. The parametric study improves understanding of the influence of various parameters on the performance of the Superbolt and aids in improving the design of this ground support technology.

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Finite Element Analysis Of Modified Conebolt Under Static And Dynamic Loadings

Cited by 2 publications

References 10 publications

Resistance of yielding rockbolts to multiple impact loads

Resistance of yielding rockbolts to multiple impact loads

Finite element analysis of the Superbolt under dynamic loading

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