Discrete element modelling of the buckling phenomenon in deep hard rock mines

Karampinos, Efstratios; Hadjigeorgiou, John; Hazzard, Jim; Turcotte, Pascal

doi:10.1016/j.ijrmms.2015.10.007

Cited by 65 publications

(14 citation statements)

References 18 publications

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“…This is only possible by using discontinuum models that can explicitly simulate the rotation of rock blocks, the dilation of the fractures and the detachment of rock blocks from their initial positions. Karampinos et al (2015a) used the 3D distinct element method (DEM) 3DEC version 5 (Itasca Consulting Group Inc 2013) to simulate the buckling mechanism at the LaRonde and Lapa mines in Canada (Figure 7). The extent of joint slip, and plastic zones around the opening indicated a direction of squeezing normal to the foliation planes.…”

Section: Buckling Failure Mechanismmentioning

confidence: 99%

“…The progressive stress redistribution and displacement can be captured through a pseudo-3D approach. The progressive reduction of the forces acting at the boundaries of the excavation by a reduction factor (r) through a series of modelling steps overcame the limitations in modelling the development of the drift (Karampinos et al 2015a). For r = 1 the face is considered to be ahead of the modelled section.…”

Section: Buckling Failure Mechanismmentioning

confidence: 99%

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Design tools for squeezing ground conditions in hard rock mines

Hadjigeorgiou¹,

Karampinos²

2017

Proceedings of the International Conference on Deep and High Stress Mining

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Squeezing ground conditions are encountered in several underground rock mines. This paper addresses the selection of appropriate engineering tools that can be used for the prediction of squeezing and investigates the relative performance of different ground support options. A clear distinction is made between squeezing as a result of weak rock or shear failure and structurally defined buckling failure of the rock mass. A critical assessment is made of available empirical tools with particular emphasis on their limitations. The second part of the paper addresses issues with the use of numerical models and, in particular, the choice of numerical models that capture the prevalent mechanisms. A case study is presented whereby different reinforcement elements are used to control large deformations in mining drives. The paper provides a path forward to assessing the potential performance of new reinforcement elements at the same mine site.

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Section: Buckling Failure Mechanismmentioning

confidence: 99%

Section: Buckling Failure Mechanismmentioning

confidence: 99%

Design tools for squeezing ground conditions in hard rock mines

Hadjigeorgiou¹,

Karampinos²

2017

Proceedings of the International Conference on Deep and High Stress Mining

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“…Gao et al (2015) applied UDEC to simulate squeezing failure process and realistically captured the intrinsic discontinuous damage and deformation. Considering the role of fractures within rock mass, Karampinos et al (2015) employed the distinct element method (3DEC) to investigate the Bending failure of roadway in deep hard rock mines. Li & Weng (2016) investigated the fracturing behaviour of an underground opening caused by dynamic disturbance; the results showed that the lateral pressure coefficient (horizontal and vertical stress ratio) was the major cause of roadway instability.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Roof Presplitting and Rock Mass Filling Approach on Controlling Large Deformations and Coal Bumps in Deep High-Stress Roadways

2019

Lat. Am. j. solids struct.

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Roadway deformation and coal bumps are major challenges for underground engineering. Taking the Lu'an mining district in Shanxi Province as an example, the failure mechanism of deep high-stress roadway was studied. Numerical simulations and the similar material test were performed to investigate the effect of the roof presplitting and rock mass filling on the stability of roadway surrounding rock. The change laws and distribution features of stress and plastic zone, and the fracture characteristics of roof strata were analyzed. Under conditions where the roof was not presplit, the roadway was in a high-stress environment due to the massive suspended roof. The failure process of the high-stress roadway began with tensile crack in the shallow roof and then extended to the two ribs, resulting in the yield of a coal pillar. Under the condition that the roof was presplit, the peak value of the vertical stress at the coal pillar was decreased from 18.2 to 9.8 MPa while that of the virgin coal rib was decreased from 15.8 to 13.5 MPa. Both the similar material test and numerical results showed that the Roof outside the Coal Pillar (RCP) was cut off along the presplitting lines and was fractured into different sizes of masses. The broken rock mass filled in the goaf and supported on the overlying strata, which reduced the load on the coal pillar. The field monitoring data indicated that implementing the roof presplitting and rock mass filling processes successfully controlled large deformations of the roadway and coal bumps, which improved the stability of surrounding rock.

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“…To date, continuum methods, discontinuum methods, and hybrid continuum/discontinuum methods have mostly been used to simulate the fracture behavior of rock masses. e differences between these methods have been discussed by researchers [4,25,26]. Continuum methods cannot present explicitly the crack initiation, propagation, and nucleation because mesh grids in the problem domain should remain in the same neighborhood during the whole deformation or transport process and thus block rotation so that opening of the mesh will not happen.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of the Failure Behavior of Intermittent Rock Joints Subjected to Direct Shear Load

Fan

Lai

et al. 2018

Advances in Civil Engineering

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Two series of intermittent rock joints containing three joints arranged along the central shear axis were considered in this study. e failure behavior under direct shear loads was investigated by means of both physical tests and numerical simulations. e cracking behavior was found to be distinctly associated with the joint arrangement. Several types of main and secondary cracks were identified. e variation trends of the crack initiation stress ratio with inclination angle were analyzed and found to be partly different for the two series of intermittent joints. e whole fracturing process was characterized by three phases. Not all samples have to experience all three phases. e second phase is alternative and can be reflected by the shearing curve. Hence, two types of shearing curves, including single and double peaks, were identified. e double peak is due to the extrusion or sawteeth cutting in the second phase. Moreover, the numerical micromechanical analysis was performed to explain the shear behavior using the contact force and microcrack within the specimen. Based on the numerically measured local stresses, maximum and minimum principal stresses around the middle joint at crack initiation stress and peak shear stress were analyzed.

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Discrete element modelling of the buckling phenomenon in deep hard rock mines

Cited by 65 publications

References 18 publications

Design tools for squeezing ground conditions in hard rock mines

Design tools for squeezing ground conditions in hard rock mines

Investigation of the Roof Presplitting and Rock Mass Filling Approach on Controlling Large Deformations and Coal Bumps in Deep High-Stress Roadways

Experimental and Numerical Study of the Failure Behavior of Intermittent Rock Joints Subjected to Direct Shear Load

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