Rock fragmentation by blasting—a literature study of research in the 1980′s and 1990′s

Latham, John; Munjiza, Antonio; Lü, Ping

doi:10.1080/13855149909408046

Cited by 14 publications

(5 citation statements)

References 36 publications

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“…e loading rate is much higher than that for static loads. erefore, the effect of the loading rate on the dynamic deformation and fracture behaviour of rock should be taken into account due to the dynamic loads, i.e., high gas pressures ranging from 0.5 GP to 50 GP [29] and strong shock waves with a velocity around 5500 m/s.…”

Section: Effect Of the Loading Rate On The Dynamic Behaviour Ofmentioning

confidence: 99%

Hybrid Finite‐Discrete Element Modelling of Excavation Damaged Zone Formation Process Induced by Blasts in a Deep Tunnel

Liu

Han

2020

Advances in Civil Engineering

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A brief literature review of numerical studies on excavation damage zone (EDZ) is conducted to compare the main numerical methods on EDZ studies. A hybrid finite-discrete element method is then proposed to model the EDZ induced by blasts. During the excavation by blasts, the rock mass around the borehole is subjected to dynamic loads, i.e., strong shock waves crushing the adjacent rocks and high-pressure gas expanding cracks. Therefore, the hybrid finite-discrete element method takes into account the transition of the rock from continuum to discontinuum through fracture and fragmentation, the detonation-induced gas expansion and flow through the fractured rock, and the dependence of the rock fracture dynamic behaviour on the loading rates. After that, the hybrid finite-discrete element method is calibrated by modelling the rock failure process in the uniaxial compression strength (UCS) test and Brazilian tensile strength (BTS) test. Finally, the hybrid finite-discrete element method is used to model the excavation process in a deep tunnel. The hybrid finite-discrete element method successfully modelled the stress propagation and the fracture initiation and propagation induced by blasts. The main components of the EDZ are obtained and show good agreements with those well documented in the literature. The influences of the initial gas pressure, in situ stress, and spacing between boreholes are discussed. It is concluded that the hybrid finite-discrete element method is a valuable numerical tool for studying the EDZ induced by blasts in deep tunnels.

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Section: Effect Of the Loading Rate On The Dynamic Behaviour Ofmentioning

confidence: 99%

Hybrid Finite‐Discrete Element Modelling of Excavation Damaged Zone Formation Process Induced by Blasts in a Deep Tunnel

Liu

Han

2020

Advances in Civil Engineering

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“…ese theoretical studies are very meaningful for comprehending the mechanisms of blast-induced crack initiation and propagation under in situ stress; however, they still have some shortcomings owing to several simplicities in the theoretical analysis, and the precision of predicting rock fragmentation is limited due to the lack of understanding of the complexity of the blasting process [19]. e vital need for better understanding of the dynamic rock fracturing process in blasting was particularly highlighted in the excellent review works by Latham et al [20], Saharan et al [21], and An et al [3].…”

Section: Introductionmentioning

confidence: 99%

Study of the Rock Crack Propagation Induced by Blasting with a Decoupled Charge under High In Situ Stress

Liu

Yang

2020

Advances in Civil Engineering

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The high in situ stress can significantly affect the blast-induced rock fragmentation and cause difficulties in deep mining and civil engineering where the drilling and blasting technique is applied. In this study, the rock crack propagation induced by blasting under in situ stress is first analyzed theoretically, and then a numerical model with a decoupled charge in LS-DYNA is developed to reveal how the initiation and propagation of rock cracks are under high in situ stress. Through simulation, the mechanisms of blast-induced crack evolution under various hydrostatic pressures and nonhydrostatic pressures are investigated, and the differences in crack evolution with specific decoupling coefficients are compared. According to the simulation, three damage zones, i.e., the crushed zone, the nonlinear fracture zone, and the radial crack propagation zone, are formed, and the radial crack evolution is greatly suppressed by the high in situ stress which has no much influence on the crack propagation in the crushed and the nonlinear fracture zones. The velocity of crack propagation is slightly reduced, and the process of crack propagation is stopped early when the rock is subjected to high in situ stress. Furthermore, the numerical analysis indicates that the crack grows preferentially in the direction of maximum principal stress, and the radial crack propagation is predominantly controlled by the preloaded pressure, which is vertical to the crack propagation direction. Based on the numerical results, it is suggested that the optimal decoupling coefficients for rock cracking are 2.65, 1.87, 1.37, and 1.22 for 0, 10, 20, and 30 MPa, respectively. This study provides not only an analysis of the rock crack evolution under high in situ stress but also a reference for resolving excavation difficulties in deep mining.

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“…AUTODYN-2D has been also utilized by Ma et al [6] in modelling of wave propagation induced by underground explosion in continuous rock mass. e authors of references [7,8] presented excellent reviews on the computer simulation of rock blasting conducted till 1990s. Articles [9,10] and especially review [11] list the number of researches published from the 1990s until today.…”

Section: Introductionmentioning

confidence: 99%

Destress Blasting of Rock Mass: Multiscale Modelling and Simulation

Baranowski

Damaziak

Mazurkiewicz

et al. 2019

Shock and Vibration

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In this paper, a multiscale modelling and simulation of destress blasting of rock mass is presented. e proposed and novel approach combines two separate 3D solutions: the first was obtained for the small-scale problem, face(s) blasting process, and the second for the global scale problem, seismic wave propagation within very large volumes of surrounding rock mass. Both the approaches were based on explicit dynamic modelling methodology using the central difference method. In the local case, the arbitrary Lagrangian-Eulerian (ALE) procedure with the Jones-Wilkins-Lee (JWL) equation defining an explosive material was used. For this purpose, a selected volume of a rock mass comprising a blasted mining face was modelled in detail. From the numerical simulation, pressure distribution over the modelled rock was obtained, which was the basis for an initial condition for the global 3D FE model. e peak particle velocity (ppv) distribution obtained from finite element analysis was compared with experimental outcomes. A reasonable agreement between both results was achieved; therefore, the adopted multiscale modelling approach confirmed its effectiveness and that it can be successfully implemented in further engineering practice.

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Rock fragmentation by blasting—a literature study of research in the 1980′s and 1990′s

Cited by 14 publications

References 36 publications

Hybrid Finite‐Discrete Element Modelling of Excavation Damaged Zone Formation Process Induced by Blasts in a Deep Tunnel

Hybrid Finite‐Discrete Element Modelling of Excavation Damaged Zone Formation Process Induced by Blasts in a Deep Tunnel

Study of the Rock Crack Propagation Induced by Blasting with a Decoupled Charge under High In Situ Stress

Destress Blasting of Rock Mass: Multiscale Modelling and Simulation

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