Título: | NUMERICAL ANALYSIS OF DYNAMIC FRACTURING OF THE ROCK BY THE EXPLOSION | ||||||||||||||||||||||||
Autor: |
ARAKEN DUMONT RAMOS LIMA |
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Colaborador(es): |
CELSO ROMANEL - Orientador |
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Catalogação: | 22/MAR/2002 | Língua(s): | PORTUGUESE - BRAZIL |
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Tipo: | TEXT | Subtipo: |
THESIS
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Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=2459&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=2459&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.2459 | ||||||||||||||||||||||||
Resumo: | |||||||||||||||||||||||||
Rock blasting are usually carried out by drilling slender
holes into a rock mass and
detonating explosive charges in their interiors. The
detonation produces a fast increase in the
temperature surrounding the holes and a huge gas expansion
that will apply high pressures on
the walls. Crushing and fracturing of the rock will occur
as a consequence of the shock waves
generated by this dynamic loading.
Blasting engineer should know the strength and deformation
characteristics of rocks
under dynamic loading in order to better understand and
estimate the effects caused by the
explosion. Rock blasting is a very complicate problem whose
simulation, to avoid
insurmountable mathematical difficulties, needs to be
developed under some simplifying
assumptions such as isotropy, linear elasticity and brittle
behavior of the material.
In this work a computational program based on the finite
element method was
developed for dynamic analyses of rock blasting. The
fracturing is considered to be primarily
caused by the stresses induced by P and SV waves. The
effects of the gas pressure inside the
fractures were neglected at the time being.
The software has the following main features: automatic generation of finite element
meshes while fracturing is still detected in the rock mass, numerical integration of the
equations of motion in the time domain, use of fracture propagation criteria based on stress
intensity factors in mixed mode I-II, consideration of silent mesh boundaries to absorb the
incident stress waves and a penalty method to enforce the impenetrability condition between
the surfaces of a same fracture, etc.
The numerical examples herein presented qualitatively indicate that the proposed
model is satisfactory for the case of dynamic fracturing of brittle rocks. They also discuss
several important aspects related to the numerical simulation, such as the number and
distribution of predominant fractures around the blasting hole, the finite element size, loss of
symmetry due to mesh configurations, etc.
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