Towards an understanding of dynamic demand on ground support

Potvin, Yves; Wesseloo, Johan

doi:10.36487/acg_rep/1304_18_potvin

Cited by 18 publications

(27 citation statements)

References 26 publications

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“…The explicit demand placed on ground support systems in localised conditions is still largely unknown. Significant investigation has been conducted into this by many researchers; however, typically more questions are raised rather than answered (Stacey, 2012 andPotvin, 2013). The method to determine typical demand on ground support elements is an empirical approach, which uses ground conditions, observations and a long list of assumptions (Potvin and Wesseloo, 2013).…”

Section: Demand and Capacity Of Ground Supportmentioning

confidence: 99%

“…Significant investigation has been conducted into this by many researchers; however, typically more questions are raised rather than answered (Stacey, 2012 andPotvin, 2013). The method to determine typical demand on ground support elements is an empirical approach, which uses ground conditions, observations and a long list of assumptions (Potvin and Wesseloo, 2013). However, where the exact demand on ground support system is difficult to determine, the capacity of a specific ground support element is much simpler to establish.…”

Section: Demand and Capacity Of Ground Supportmentioning

confidence: 99%

“…As the mining industry matures, near surface deposits become depleted, resulting in a need to mine at increasing depths. Some mines are exceeding 2 km in Australia, 3 km in Canada and even 4 km in South Africa (Potvin and Wesseloo, 2013). With these increasing depths come many risks, including an increase in in situ stresses and the likelihood of seismic events.…”

Section: Introductionmentioning

confidence: 99%

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A new method to evaluate dynamic bolts and the development of a new dynamic rock bolt

Darlington¹,

Rataj²,

Roach³

2019

Proceedings of the Ninth International Conference on Deep and High Stress Mining

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Until science advances our current understanding of the demands and capacity of ground support, empirical design, rather than scientific methods, must be used. When considering ground support capacity, the industry has developed a significant database of laboratory dynamic tests on rock bolts. However, a methodology has not yet been developed to translate these laboratory test results into the in situ dynamic capacity of ground support systems. Recent development and implementation of in situ testing of dynamic bolts, provides a significant improvement in evaluation and interpretation of test results. In situ testing is carried out using a portable dynamic test rig (DTR), which simulates a seismic event through a dynamic impulse applied to a test bolt. This new tool also provides an opportunity to study the effects of mining progression on bolt performance. The DTR was utilised to test the recently developed D47 MDX bolt. The 47 mm diameter MDX bolt was tested at various hard rock mines in Australia with a typical 25 kJ dynamic impulse, causing bolt displacement typically between 100mm to 150 mm.

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Section: Demand and Capacity Of Ground Supportmentioning

confidence: 99%

Section: Demand and Capacity Of Ground Supportmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A new method to evaluate dynamic bolts and the development of a new dynamic rock bolt

Darlington¹,

Rataj²,

Roach³

2019

Proceedings of the Ninth International Conference on Deep and High Stress Mining

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show abstract

“…Important limitations of the ppv scaling laws include the assumption of a spherical radiation pattern and the disregard of seismic-wave reflection and refraction phenomena. This can lead to important discrepancies between actual and predicted levels of ground motion (Potvin & Wesseloo 2013;Milev et al 2002). Furthermore, the amplification of seismic waves in the vicinity of excavations cannot be quantified reliably (Durrheim 2012).…”

Section: Ground Motion Levelmentioning

confidence: 99%

The development of a ground support design strategy for deep mines subjected to dynamic-loading conditions

Morissette¹,

Hadjigeorgiou²

2017

Proceedings of the International Conference on Deep and High Stress Mining

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In underground mines, a ground support system is required to maintain the integrity of an excavation over its service life. The design of support systems typically accounts for the anticipated static loads and is, to some extent, supported by quantitative engineering guidelines. In deep and high stress mines, dynamic loads associated with mining-induced seismicity represent an important component of the demand imposed on the support. Quantifying dynamic loads that apply on, and between, reinforcement and surface support elements is an important challenge. In this respect, the design of ground support systems for dynamic-loading conditions has relied importantly on qualitative assessments of support performance. This paper presents a ground support design strategy, supported by high-quality field data, for deep and high stress mines subjected to dynamic-loading conditions. The strategy has been developed and validated using rockburst data from three seismically active mines located in the Sudbury region, Canada, and cumulating 32 years of mining.

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“…Rockbursts are common disasters in underground engineering of high stress [15,16]. When the rockburst occurs, the energy releases sharply, which makes the surrounding rockmasses suddenly broken under unknown conditions.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Stability Analysis of Rockmass: A Review

Dong

Wang

et al. 2018

Advances in Civil Engineering

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ere are a series of human or natural activities, including earthquakes, explosions, and rockbursts, which have caused a number of safety accidents in geotechnical engineering. is review paper summarized the theories and methods for dynamic stability analysis of rockmass. First, numerical simulation methods, including finite element method (FEM), discrete element method (DEM), finite difference method (FDM), boundary element method (BEM), discontinuous deformation analysis method (DDA), and numerical manifold method (NMM), are summarized. Second, the laboratory experiments, containing shaking table test, split-Hopkinson pressure bar test (SHPB), improved true-triaxial test, dynamic centrifugal model test, acoustic emission (AE) technique, and dynamic infrared monitoring, are considered. ird, the in situ tests including microseismic (MS) technique, velocity tomography, stress-strain monitoring, and electromagnetic radiation monitoring are considered. Finally, some comprehensive analysis methods based on statistical theories are also provided. It is pointed out that the study foundation for the dynamic stability of rockmass is weak to explain the mechanism. So, a set of general comprehensive theories integrating the different methods, including theoretical analysis, numerical methods, laboratory experiments, and in situ tests, should be completely established. is is the most effective way for further investigation.

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Towards an understanding of dynamic demand on ground support

Cited by 18 publications

References 26 publications

A new method to evaluate dynamic bolts and the development of a new dynamic rock bolt

A new method to evaluate dynamic bolts and the development of a new dynamic rock bolt

The development of a ground support design strategy for deep mines subjected to dynamic-loading conditions

Dynamic Stability Analysis of Rockmass: A Review

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