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Shock and Vibration
Volume 2015, Article ID 373021, 8 pages
http://dx.doi.org/10.1155/2015/373021
Research Article

Damage Characteristics of Surrounding Rock Subjected to VCR Mining Blasting Shock

1Engineering Research Center of Rock-Soil & Excavation and Protection, Ministry of Education, Wuhan 430074, China
2Faculty of Engineering, China University of Geosciences, Wuhan 430074, China

Received 23 July 2014; Accepted 28 September 2014

Academic Editor: Caiping Lu

Copyright © 2015 Nan Jiang 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

For limiting the damage range caused by explosive shock loads in vertical crater retreat (VCR) mining, the blasting damage characteristics of surrounding rock were studied by two methods: numerical simulation and ultrasonic testing. Combined with the mining blasting in Dongguashan Copper Mine of China, the VCR blasting shock characteristics under different conditions are obtained by using LSDYNA. Based on statistical fracture mechanics and damage mechanics theories, a damage constitutive model for rock mass subjected to blasting shock load was established. Then by using the fast Lagrange analysis codes (FLAC3D), the blasting damage characteristics of surrounding rock were analyzed by applying the blasting shock loads obtained from the VCR mining and the damage zone is obtained. At last, the relationship between the amount of explosives and the radius of damaged surrounding rock mass was discussed, and its formula was also derived. The research provides a theoretical basis for rationally controlling stope boundaries and optimizing mining blasting parameters.