Numerical analysis of blast-induced anisotropic rock damage

Blast -induced anisotropic rock damage around a blast-hole was analyzed by a using numerical method with user-defined subroutine based on continuum damage mechanics. Anisotropic blasting pressure was evaluated by applying anisotropic rock characteristics to analytical solution which is a function of explosive and rock properties. Anisotropic rock damage was evaluated by applying the proposed anisotropic blasting pressure. Blast-induced isotropic rock damage was also analyzed. User-defined subroutines to solve anisotropic and isotropic damage model were coded. Initial rock damages in natural rock were considered in anisotropic and isotropic damage models. Blasting pressure and elastic modulus of rock were major influential parameters from parametric analysis results of isotropic rock damage. From the results of anisotropic rock damage analysis, blasting pressure was the most influential parameter. Anisotropic rock damage area in horizontal direction was approximately 34% larger and about 12% smaller in vertical direction comparing with isotropic rock damage area. Isotropic rock damage area under fully coupled charge condition was around 30 times larger than that under decoupled charge condition. Blasting pressure under fully coupled charge condition was estimated to be more than 10 times larger than that of decoupled charge condition.

keywords: 이방성 발파압력, 이방성 암반손상, 이방성 손상 모델, 매개변수 분석, Anisotropic blasting pressure, anisotropic rock damage, anisotropic damage models, parametric analysis, Anisotropic blasting pressure, anisotropic rock damage, anisotropic damage models, parametric analysis

Reference

(1970) Triaxial Anisotropy of Wave Velocity and Elastic Moduli in Slate and Their Axial Concordance with Fabric and Tectonic Symmetry,

(1987) Separating Shock Wave and Gas Expansion Breakage Mechanical,

(1980) Continuum Modeling of Explosive Fracture in Oil Shale,

(2002) Numerical Analysis of Blast-Induced Stress Waves in a Rock Mass with Anisotropic Continuum Damage Models,

(2002) Numerical Analysis of Blast-Induced Stress Waves in a Rock Mass with Anisotropic Continuum Damage Models. Part 2: Stochastic Approach" Rock Mech. Rock Engng. 35(2) pp. 79-94.,

(1988) Deformation and fracturing behaviour of discontinuous rock mass and damage mechanics theory,

(1985) a Damage Mechanics Theory for Discontinuous Rock Mass Proc. 5th Int. Conf. Num. Method in Geomech.,

(1997) Development of a continuum damage model for blasting analysis,

(1983) Notion of Continuum Damage Mechanics and Its Application to Anisotropic Creep Damage Theory,

10.

(1970) Some Special Featires of Deformability of Rock Masses Adjoining a Gallery,

11.

(1960) Prediction of Elastic Constants of Multiphase Materials,

12.

(1973) Laboratory Studies on Kolar Rocks,

13.

(1974) Fragmentation of Rock under Dynamic Loads,

14.

(1987) An investigation of the usefulness of stemming in crater blasting,

15.

(1994) Advances in Computational Mechanics Applied to Wave Propagation Problem Computer Methods and Advances in Geomechanics,

16.

(1990) Analysis of Random Anisotropic Damage Mechanics Problems of Rock Mass,

17.

(2001) Analysis of Anisotropic Damage of th Bukit Timah Granite,

18.

(2003) Distinctive and Fuzzy Failure Probability Analysis of and Anisotropic Rock Mass to Explosion Load",

19.

(1996) New Constitutive Model for Blast Damage" ,

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Article Contents

Vol.6 No.4

Numerical analysis of blast-induced anisotropic rock damage

Abstract

Reference

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