Numerical Analysis of Blast-Induced Stress Waves in a Rock Mass with Anisotropic Continuum Damage Models Part 2: Stochastic Approach |
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Authors: | H Hao C Wu C C Seah |
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Institution: | (1) Department of Civil and Resource Engineering, University of Western Australia, Crawley, Australia, AU;(2) Protective Technology Research Center, Nanyang Technological University, c\o School of CEE, Singapore, SG;(3) Defense Science and Technology Agency, Ministry of Defense, Singapore, SG |
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Abstract: | Summary
This paper reports the second part of the study carried out by the authors on the underground explosion-induced stress wave
propagation and damage in a rock mass. In the accompanying paper reporting the first part of the study, equivalent material
properties were used to model the effects of existing cracks and joints in the rock mass. The rock mass and its properties
were treated as deterministic. In this paper, existing random cracks and joints are modeled as statistical initial damage
of the rock mass. In numerical calculation, an anisotropic continuum damage model including both the statistical anisotropic
initial damage and cumulative damage dependent on principal tensile strain and stochastic critical tensile strain is suggested
to model rock mass behavior under explosion loads. The statistical estimation of stress wave propagation in the rock mass
due to underground explosion is evaluated by Rosenblueth's point estimate method. The suggested models and statistical solution
process are also programmed and linked to Autodyn3D as its user's subroutines. Numerical results are compared with the field
test data and those presented in the accompanying paper obtained with equivalent material property approach. |
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Keywords: | |
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