International Journal of Earth Sciences and Engineering

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The fractures in rock influence propagation behavior of blasting waves and then it may result in higher blasting boulder yield and affect blasting result. According to the character of rock with closed macro fractures, the features of stress wave propagation in the rock with one inclined fracture, two parallel fractures and two crossed fractures were studied. The numerical models were established in 3DEC combined with LS-DYNA. The explosion wave was simulated by LS-DYNA and transformed into data form readable for 3DEC. Then the propagation behavior of blasting wave was calculated by 3DEC. The computation results show that the stress wave distributed differently in rock with different fractures. Comparing with intact rock, fractures can divide the stress region into parts. The minimum principal stress reduced quickly with the number of fractures increasing. In rock with two crossed fractures, the value of tensile stress near the blasthole reduced about 30 percent.

Keywords

3DEC, LS-DYNA, Wave Propagation, Fractures, Stress Distribution.
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