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Advances in Materials Science and Engineering
Volume 2015 (2015), Article ID 108580, 9 pages
http://dx.doi.org/10.1155/2015/108580
Research Article

Numerical Study on Crack Propagation by Using Softening Model under Blasting

1College of Architecture and Environment, Sichuan University, Chengdu, Sichuan 610065, China
2College of Environment and Resources, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China

Received 12 April 2015; Revised 16 July 2015; Accepted 21 July 2015

Academic Editor: Cristina Leonelli

Copyright © 2015 Rong Hu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A mixed failure criterion, which combined the modified maximum principal stress criterion with the damage model of tensile crack softening, was developed to simulate crack propagation of rock under blasting loads. In order to validate the proposed model, a set of blasting models with a crack and a borehole with different incident angles with the crack were established. By using this model, the property of crack propagation was investigated. The linear equation of state (EOS) was used for rock, and the JWL EOS was applied to the explosive. In order to validate the numerical simulation results, experiments by using PMMA (polymethyl methacrylate) with a crack and a borehole were carried out. The charge structure and incident angle of the blasting experimental model were the same as those in the numerical models. The experiment results agree with the numerical simulation results.