Rockbolt behaviour under dynamic loading: Field tests and modelling

Tannant, Dwayne D.; Brummer, Richard; Xue, Yi

doi:10.1016/0148-9062(95)00024-b

Cited by 55 publications

(26 citation statements)

References 6 publications

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“…Investigation of the distribution of the load along the fixed anchor length was also undertaken with the model and the results obtained, which showed an exponential distribution, were in agreement with previous theoretical [8][9][10][11] and laboratory studies [12][13][14][15]. Unlike previous models [16] this lumped parameter model is able to replicate the effect of prestress load in the rock bolt when the anchor head is modelled and incorporated in the model [17]. The model improved the performance of the GRANIT system and is currently used successfully as part of it.…”

Section: Introductionsupporting

confidence: 83%

Influence of geometry and material properties on the axial vibration of a rock bolt

Ivanović

Neilson

2008

International Journal of Rock Mechanics and Mining Sciences

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Section: Introductionsupporting

confidence: 83%

Influence of geometry and material properties on the axial vibration of a rock bolt

Ivanović

Neilson

2008

International Journal of Rock Mechanics and Mining Sciences

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“…Striking the end activates axial (longitudinal) modes, while striking the side activates bending (transverse) frequencies (Morse, 1948). Tannant et al (1995) report on experiments similar to this investigation on rock bolts. In his experiments, strain gauges were placed on either side of the bolt.…”

Section: Expected Outcomementioning

confidence: 60%

“…The closed-form solution for axial vibrations in a rock bolt that is clamped or free at both ends is given by (1) (Tannant, 1995). Calculations from this equation were compared to the finite element modeling results for the same bolt configuration.…”

Section: Axial Bolt Vibrationsmentioning

confidence: 99%

“…The third closed-form equation was for the fundamental frequency of a string clamped at both ends under tension (4) (Tannant, 1995) where f n is the frequency, L is the length of the rock bolt (two m), T is the tension in the string, p is the density of steel (7800 kg/m3), and A is the cross-sectional area of the rock bolt. The diameter of the 'string' is 16 mm.…”

Section: Clamped Stringmentioning

confidence: 99%

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Rockburst Research Applied to Nuclear Event Discrimination

Hoffman¹,

Cook²,

Baker³

et al. 1999

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Public reporting burden for this collection of information is estimated to average 1 hour per respo gathering and maintaining the data needed, and completing and reviewing the collection of inforr-* collection of information, including suggestions for reducing this burden, to Washington Headqua Davis Highway, Suite 1204, Arlington, VA 22202-4302, and Rockbursts produce seismic signals that are similar to those associated with near surface earthquakes and explosions. Some o: the methods developed for source mechanism studies also encompass imaging techniques appropriate for nuclear event verification, and, as a result, have implications for the Comprehensive Test Ban Treaty (CTBT). Past experiments have demonstrated a clear relationship between Barkhausen Noise (BN) and stress in pipeline steel samples. Stress can affect the nature of the pinning sites at domain boundaries which in turn plays a role in the way that domain walls move and cause BN pulses. We have conducted experiments to detect a relationship between BN and stress in magnetite-rich rocks. These experiments were performed by applying uniaxial loading from 4500N to 55000N to cylindrical core samples of magnetite-rich rocks obtained from the Stillwater Complex in Montana. A pick-up coil was used to detect the BN pulses and an electromagnet was used to magnetize the samples. BN pulses were recorded during a specified time interval for each increment of loading. The pick-up coil was positioned to be near magnetite-rich regions of the sample. We have observed a linear increase in the number of BN pulses with increased loading. Ongoing research is focused on refining the experimental procedure to increase the bandwidth of recording and eliminate possible sources of noise in the experiments. The results of this study might help us to understand the nature of the remagnetization that often accompanies large-scale tectonic events. Moreover, this study could lead to a method of nondestructive testing to determine state of stress at mine walls. MQOQttO I5(j SUMMARY The basis for this research is that rockbursts produce seismic signals that are similar to those associated with near surface earthquakes and explosions. A complete understanding of source mechanisms is necessary for the correct identification of these events. Some of the methods developed for source mechanism studies also encompass imaging techniques appropriate for nuclear event verification, and, as a result, have implications for the Comprehensive Test Ban Treaty (CTBT). SUBJECT TERMSPCI/Atlantic Scientific INSAR software was purchased last fall for elevation change detection at a rockburst site using radar interferometry. We have been familiarizing ourselves with this software and radar remote sensing. Images have recently been acquired that cover the site of a large rockburst.The air wave can interfere with the rock wave in Ground Penetrating Radar (GPR) transillumination experiments making it difficult to pick the rock wave first arrivals in mines. This was particularly a problem at small t...

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“…Civil and mining engineering employs various devices for support and reinforcement [1][2][3][4][5][6][7]. Examples include ground anchors, which are mainly used for ground reinforcement, and rock and cable bolts that reinforce rock [8,9].…”

Section: Introductionmentioning

confidence: 99%

Interaction between an Eco-Spiral Bolt and Crushed Rock in a Borehole Evaluated by Pull-Out Testing

Kang¹,

Hirata²,

Jang³

et al. 2017

Advances in Materials Science and Engineering

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The interactions between an eco-spiral bolt and crushed rocks in a borehole were evaluated by pull-out testing in a laboratory and numerical analysis. The porosity of the crushed rock surrounding the bolt depended on the size of the eco-spiral bolt and affected the eco-spiral bolt's axial resistance force. The axial resistance force and the porosity of the crushed rocks in the borehole showed an inverse relationship. The porosity was also related to the size of the eco-spiral bolt. The maximum principal stress between the bolt and the rock was related to the porosity of the crushed rock and the size difference between the eco-spiral bolt and the borehole. At low porosity the experimental and numerical analyses show similar relationships between the axial resistance force and the displacement. However, at high porosity, the numerical results deviated greatly from the experimental observation. The initial agreement is attributed to the state of residual resistance after the maximum axial resistance force, and the latter divergence was due to the decreasing axial resistance force owing to slippage.

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Rockbolt behaviour under dynamic loading: Field tests and modelling

Cited by 55 publications

References 6 publications

Influence of geometry and material properties on the axial vibration of a rock bolt

Influence of geometry and material properties on the axial vibration of a rock bolt

Rockburst Research Applied to Nuclear Event Discrimination

Interaction between an Eco-Spiral Bolt and Crushed Rock in a Borehole Evaluated by Pull-Out Testing

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