Modeling fractures in rock blasting

Donzé, Frédéric; Bouchez, J.; Magnier, Sophie-Adélaïde

doi:10.1016/s0148-9062(97)00300-8

Cited by 61 publications

(76 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The initiation and propagation mechanisms have been investigated in [Ingraffea 1983;Mortazavi and Katsabanis 2001;Cho et al 2004]. Generally, two forms of radial crack analysis have been used: dynamic crack analysis (considering stress wave and/or gas pressurization theories) and quasistatic crack analysis (considering only gas pressurization theory); see [Kutter and Fairhurst 1971;Courtesen 1979;Ash 1985;Donzé et al 1997;Cho et al 2004]. Dynamic crack analysis is far beyond our scope; instead we briefly consider quasistatic radial crack analysis due to gas pressurization, to show the effectiveness of the present model for solving some crack problems occurring in rock fracture mechanics.…”

Section: Numerical Analysis Of Radial Cracks In Blastingmentioning

confidence: 99%

A semi-infinite higher-order displacement discontinuity method and its application to the quasistatic analysis of radial cracks produced by blasting

Hosseini-Nasab

Marji

2007

JOMMS

View full text Add to dashboard Cite

We introduce a higher-order indirect boundary element method in a traction-free half-plane known as semi-infinite displacement discontinuity method. The method is modified to use the linear elastic fracture mechanics principles for radial crack analysis in brittle materials like rocks. In this numerical method there is no need to discretize the traction-free boundary of the half-plane into higher-order elements thus decreasing the number of elements without affecting the accuracy of the solution to the desired problems. The use of higher-order elements increases the accuracy so that it is possible to discretize both the boundary of the body and radial cracks by the same higher-order elements, therefore there may be no need to use the more complicated hybrid methods. A special crack tip element is added for each crack tip to increase the accuracy of displacement discontinuities near the crack ends due to their singularities. Based on the brittle behavior of most rocks, linear elastic fracture mechanics principles have been used to find the fracture mechanics parameters (mode-I and mode-II mixed mode stress intensity factors) of radial cracks occurring in common blasting operations. Arbitrary fracture criteria can be implemented in this code, but here a simple maximum tangential stress criterion is used to predict the angle of deviation (initiation) of radial cracks. Although this code is specially designed to include the traction-free halfplane problems, it is somewhat comprehensive so that any number of radial cracks with any length in the finite, infinite and semi-infinite planes can be treated easily. The validity of the method is proved by solving simple examples and some previously solved problems in the literature.

show abstract

Section: Numerical Analysis Of Radial Cracks In Blastingmentioning

confidence: 99%

A semi-infinite higher-order displacement discontinuity method and its application to the quasistatic analysis of radial cracks produced by blasting

Hosseini-Nasab

Marji

2007

JOMMS

View full text Add to dashboard Cite

show abstract

“…As seen in Equation 3.5, this criterion suggests that the tensile force required for contact failure is linearly proportional to the DEM element radius R.~ Several researchers have imposed a limit in both the tensile and shear stress in the contact, as shown in Figure 3.3 (Potyondy et al 1996;Donze et al 1997;Magnier and Donze 1998). These thresholds are also selected according to shear and tensile strengths determined in laboratory experiments.…”

Section: Determination Of Inter-element Normal and Shear Stiffnessmentioning

confidence: 99%

Discrete Element Method for Modeling Penetration

Tavarez

Plesha

2004

Problems Involving Thermal Hydraulics, Liquid Sloshing, and Extreme Loads on Structures

View full text Add to dashboard Cite

Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of Information. SPONSORING I MONITORING AGENCY NAME(S) AND ADDRESS(ES) SPONSORIMONITOR'S ACRONYM(S), DISTRIBUTION /AVAILABILITY STATEMENTUnclassified -Unlimmeted distribution. SUPPLEMENTARY NOTES ABSTRACTThis research resulted in the development of the Discrete Element Method (DEM) as a general, robust, and scalable computer technique for unified modeling of the mechanical behavior of solid and particulate materials, including the transition from solid phase to particulate phase. Applications include gross damage of structures due to extreme load events, and high speed penetration of structures, involving materials such as concrete, rock, and novel combinations of these.This computer approach is useful for assessing vulnerability of military and civilian facilities such as nuclear power reactors, transportation facilities, buildings, and so on, and for assessing efficacy of military operations involving such structures.One of the primary accomplishments of this research is the development of interelement potentials for the DEM method such that accurate and convergent results are obtained. This research resulted in the development of the Discrete Element Method (DEM) as a general, robust, and scalable computer technique for unified modeling of the mechanical behavior of solid and particulate materials, including the transition from solid phase to particulate phase. Applications include gross damage of structures due to extreme load events, and high speed penetration of structures, involving materials such as concrete, rock, and novel combinations of these. This computer approach is useful for assessing vulnerability of military and civilian facilities such as nuclear power reactors, transportation facilities, buildings, and so on, and for assessing efficacy of military operations involving such structures. One of the primary accomplishments of this research is the development of interelement potentials for the DEM method such that accurate and convergent results are obtained. SUBJECT

show abstract

“…Meanwhile, the presence of water can help guide the explosive shock waves, promote fracture propagation, avoid high temperature, and prevent hazards like sparks. In this technique, the blast-hole loading and sealing procedure is simplified and the explosive in blast holes can presplit hard coal and rock in a safer and more effective manner [22][23][24][25]. In this study, the technique of confined blasting in water-filled deep holes was applied to presplit the thick seam and hard roof in Datong Coal Mine area.…”

Section: Introductionmentioning

confidence: 99%

Application of Confined Blasting in Water-Filled Deep Holes to Control Strong Rock Pressure in Hard Rock Mines

Yang

2017

Energies

View full text Add to dashboard Cite

Abstract:In extra-thick coal seams, mining operations can lead to large-scale disturbances, complex overburden structures, and frequent and strong strata behavior in the stope, which are serious threats to mine safety. This study analyzed the overburden structure and strata behavior and proposed the technique of confined blasting in water-filled deep holes as a measure to prevent strong rock pressure. It found that there are two primary reasons for the high effectiveness of the proposed technique in presplitting hard coal and rock. First, the fracture water enables much more efficient transfer of dynamic load due to its incompressibility. Second, the subsequent expansion of water can further split the rock by compression. A mechanical model was used to reveal how the process of confined blasting in water-filled deep holes presplit roof. Moreover, practical implementation of this technique was found to improve the structure of hard, thick roof and prevent strong rock pressure, demonstrating its effectiveness in roof control.

show abstract

Modeling fractures in rock blasting

Cited by 61 publications

References 0 publications

A semi-infinite higher-order displacement discontinuity method and its application to the quasistatic analysis of radial cracks produced by blasting

A semi-infinite higher-order displacement discontinuity method and its application to the quasistatic analysis of radial cracks produced by blasting

Discrete Element Method for Modeling Penetration

Application of Confined Blasting in Water-Filled Deep Holes to Control Strong Rock Pressure in Hard Rock Mines

Contact Info

Product

Resources

About