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(사)한국터널지하공간학회

ISSN : 2233-8292

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Vol.8 No.2

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Analysis of Granite Behavior In Blasting Using Microplane Constitutive Model

(사)한국터널지하공간학회 / (사)한국터널지하공간학회, (P)2233-8292; (E)2287-4747
2006, v.8 no.2, pp.87-99



& (2006). Analysis of Granite Behavior In Blasting Using Microplane Constitutive Model. (사)한국터널지하공간학회, 8(2), 87-99.

Abstract

A kinematically constrained microplane constitutive model is developed for intact granite. The model is verified by fitting the experimented data of Westerly granite and Bonnet granite. Using the model with the standard finite element method, the behavior of the intact granite subjected blasting impact is studied. What is studied includes the attenuation of the blasting waves, the size of the fractured zone and the effect of the charge condition to avoid overbreak of the rock mass. The model developed captures the energy loss due to the inelastic behavior and the microcracking of granite during blasting very well. The attenuation of the blasting waves calculated based on the model is much more than that based on the linear-elastic constitutive law. The size of damaged (or fractured) zone is calculated directly from the principal strain as blasting impact is spreading, not like in the case with the linear elasticity model.

keywords
Microplane model, material modelling, plasticity, fractured zone, blasting, 마이크로플레인 모델, 재료모델, 소성, 파쇄영역, 발파, Microplane model, material modelling, plasticity, fractured zone, blasting

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