Simulation of Brittle Failure Around Canada’s Mine-By Experiment Tunnel Using 2D Continuum-Based Voronoi Tessellated Models

Sanipour, Soheil; Bahrani, Navid; Corkum, A. G.

doi:10.1007/s00603-022-02969-7

Cited by 18 publications

(3 citation statements)

References 43 publications

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“…In Section 5.1, we delve into the analysis of fracture evolution characteristics of rock samples, focusing on block size under the tetrahedral block assembly mode. While numerous studies have utilized the twodimensional voronoi block assembly to investigate crack propagation and energy evolution in brittle rock samples [37][38][39][40] , the utilization of the three-dimensional voronoi block assembly in establishing the BBM is less prevalent 41 . To assess the comparative influence of these two block assembly types on crack propagation in a three-dimensional context, we established a synthetic rock sample utilizing three-dimensional voronoi block assembly, with size of 6 mm.…”

Section: Effect Of Block Shape On Deformation and Failure Of Fracture...mentioning

confidence: 99%

Fractal evolution characteristics of fracture meso-damage in uniaxial compression rock masses using bonded block model

Lan,

He,

Wang

et al. 2024

Preprint

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In the realm of underground mining engineering, an investigation into the failure mode of deep fractured rock masses and their corresponding acoustic emission signal characteristics is conducted via uniaxial compression tests. Subsequently, a fractal damage renormalization group mechanical model is formulated to elucidate the behavior of such fractured rock masses. Employing the BBM numerical simulation method, the fracture process of synthetic rock samples is analyzed, thereby confirming the efficacy of the aforementioned mechanical model. The numerical simulations underscore that the expansion of fractures fundamentally underpins the deterioration of rock mass strength. A decrease in peak load correlates with an increase in fracture fractal dimension, resulting in a 14.2% reduction in compressive strength alongside an approximate 8.7% rise in average fracture fractal dimension. Comparison between tetrahedral and Voronoi block synthetic rock samples reveals the former's superior aptitude in depicting the fracture behavior of fractured rock masses, particularly in terms of simulating acoustic emission characteristics and failure modes. Moreover, the variation in fracture fractal dimension with the hole defect's position is observed, with its maximum value aligning with the vertical hole defect axis. This observation underscores the potential utility of visually monitoring deep rock fracture dynamics as a foundational element for quantitatively evaluating fracture damage and strength degradation in deep rock formations.

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Section: Effect Of Block Shape On Deformation and Failure Of Fracture...mentioning

confidence: 99%

Fractal evolution characteristics of fracture meso-damage in uniaxial compression rock masses using bonded block model

Lan,

He,

Wang

et al. 2024

Preprint

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“…When using static and dynamic rock breakage methods (soundless cracking agents, tunnel boring machine, gas blasting, rock blasting, etc.) to excavate rock, the excavation and unloading process will disrupt the ground stress balance and cause redistribution of stress in the surrounding rock [1][2][3][4]. The energy stored in the surrounding rock is gradually dissipated, while geological, thermal, mechanical, hydraulic, chemical and acoustic characterization of the surrounding rock are affected [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

The criterion for dividing the surrounding rock EDZs of underground caverns based on the energy dissipation degree

Wang

Zhang

et al. 2023

PLoS ONE

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An energy calculation parameter named the energy dissipation degree (RUd) is introduced based on the analysis of the energy dissipation mechanism and energy evolution characteristics during conventional triaxial tests of the granite of Shuangjiangkou. The deviatoric stress‒strain curve of rock can be divided into five stages using four stress thresholds (crack closure stress σcc, crack initiation stress σci, damage stress σcd and peak stress σp), which also correspond to the four RUd thresholds (RUdc, RUdi, RUdd and RUdp) on the energy dissipation degree–strain curve. A given stress threshold increases with increasing confining pressure; however, a given RUd threshold is basically stable under different confining pressures. Then, a new criterion for dividing the excavation damaged zones (EDZs) in the rock surrounding underground caverns based on the monotonically increasing characteristics of the energy dissipation degree‒axial strain relationship curve is proposed, and it allows for the classification of the surrounding rock into five types of zones through quantitative analysis of the RUd thresholds. Based on the criterion for dividing the EDZs of the surrounding rock mass of the underground cavern, the EDZs of the surrounding rocks of the underground cavern group of the Shuangjiangkou Hydropower Station are analyzed. The distribution characteristics of the EDZs of the rock surrounding underground caverns obtained by numerical simulation calculations based on RUd are basically the same as those obtained by in situ elastic wave tests. However, the RUd-based method for classifying the EDZs of the surrounding rock has the obvious advantage of being able to probe the boundaries of the undamaged zone (UDZ) of the surrounding rock more explicitly, while the method based on wave velocity testing is not sufficiently explicit. The damage zoning of the surrounding rock based on RUd can provide support design advice for the excavation of the surrounding rock, such as the support method, the length of the free section and anchor section of the prestressing anchor, etc.

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“…Using continuum materials, rockmass characterization schemes can be employed to account for discontinuities including veins and fractures such as the composite geological strength index [3] coupled with the generalized Hoek-Brown shear strength criterion [9,10]. In pseudo-discontinuum and discontinuum modelling methods, discrete elements representing individual geological discontinuities can be incorporated [8,11,12]. In finite element method (FEM) geomechanics numerical modelling software, pseudo-discrete joint elements enable simulation of discontinuities using macro-mechanical parameters that can be measured through physical laboratory testing.…”

Section: Introductionmentioning

confidence: 99%

Veined Rock Performance under Uniaxial and Triaxial Compression Using Calibrated Finite Element Numerical Models

Rudderham,

Day

2023

Geotechnics

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Geotechnical rockmass characterization is a key task for design of underground and open pit excavations. Hydrothermal veins influence excavation performance by contributing to stress-driven rockmass failure. This study investigates the effects of vein orientation and thickness on stiffness and peak strength of laboratory scale specimens under uniaxial and triaxial compression using finite element numerical experiments of sulfide veined mafic igneous complex (CMET) rocks from El Teniente mine, Chile. The initial numerical models are calibrated to and validated against physical laboratory test data using a multi-step calibration procedure, first of the unveined Lac du Bonnet granite to define the model configuration, and second of unveined and veined CMET. Once calibrated, the numerical experiment involves varying the vein geometry in the veined CMET models by orientation (5 to 85°) and thickness (1, 4, 8 mm). This approach enables systematic investigation of any vein geometry without limitations of physical specimen availability or complexity of physical materials. This methodology greatly improves the value of physical laboratory test data with a limited scope of vein characteristics by using calibrated numerical models to investigate the effects of any other vein geometry. In this study, vein orientation and thickness were both found to have a significant impact on the specimen stiffness and peak strength.

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Simulation of Brittle Failure Around Canada’s Mine-By Experiment Tunnel Using 2D Continuum-Based Voronoi Tessellated Models

Cited by 18 publications

References 43 publications

Fractal evolution characteristics of fracture meso-damage in uniaxial compression rock masses using bonded block model

Fractal evolution characteristics of fracture meso-damage in uniaxial compression rock masses using bonded block model

The criterion for dividing the surrounding rock EDZs of underground caverns based on the energy dissipation degree

Veined Rock Performance under Uniaxial and Triaxial Compression Using Calibrated Finite Element Numerical Models

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