Numerical Analysis of Blast-Induced Stress Waves in a Rock Mass with Anisotropic Continuum Damage Models Part 1: Equivalent Material Property Approach |
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| Authors: | H Hao C Wu Y Zhou |
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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 uses the concept of anisotropic damage mechanics to analyze dynamic responses of a granite site under blasting
loads. An anisotropic continuum damage model is suggested to model rock mass behavior under blasting loads. The effects of
existing cracks and joints in the rock mass are considered by using equivalent rock material properties obtained from both
field and laboratory test data. The anisotropic damage accumulations are simulated by continuous degradation of equivalent
material stiffness and strength during loading process and are calculated using the exponential function with respect to the
principal tensile strain in three directions. The suggested models are programmed and linked to an available computer program
Autodyn3D through its user's subroutine capability. Stress wave propagation and damage zone in the rock mass induced by underground
explosions are simulated. Numerical results of damaged area, peak particle velocity and acceleration attenuation as well as
acceleration time histories and Fourier spectra are compared with those from independent field tests. |
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