Cavities and gas penetrations from blasts in stressed rock with flooded joints

Coursen, D.L.

doi:10.1016/0094-5765(79)90103-6

Cited by 12 publications

(2 citation statements)

References 21 publications

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“…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

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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.

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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

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“…4 EARLY PRODUCTION FROM SOME DEVONIAN SHALE GAS WELLS 4 EARLY PRODUCTION FROM SOME DEVONIAN SHALE GAS WELLS…”

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confidence: 99%

Early Production From Some Devonian Shale Gas Wells Stimulated With Several Kinds of Explosive Charge

Coursen

1983

Proceedings of SPE Eastern Regional Meeting

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Early cumulative production from Devonian Shale gas wells stimulated with a high energy water gel explosive averaged 2 times that from nearby wells stimulated with dynamite.From an estimate of production loss due to well damage done by post-shot drilling in the shot zone, it is concluded that production from the wells stimulated with water gel would have averaged 5 times that from dynamite stimulations if no such drilling had been done.It releases an expansion energy per unit mass that is about twice that of dynamite. This doubling of both the expansion energy per unit mass and the mass per unit length of hole means that the energy applied to the rock can be approximately four times that from a charge of dynamite.

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Fragmentation Studies with Small Flaws

Fourney

1983

Rock Fracture Mechanics

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Cavities and gas penetrations from blasts in stressed rock with flooded joints

Cited by 12 publications

References 21 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

Early Production From Some Devonian Shale Gas Wells Stimulated With Several Kinds of Explosive Charge

Fragmentation Studies with Small Flaws

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