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| Experimental study on rock damage of roadway excavation by cumulative blasting in structural coal |
| ZHU Feihao1，2，LIU Zegong1，2，GAO Kui1，2，LIU Jian1，2 |
(1. College of Energy and Safety，Anhui University of Science and Technology，Huainan，Anhui 232001，China；
2. Key Laboratory of Mine Safety and High Efficient Mining Jointly Built by Province and Ministry of Education，Anhui University of Science and Technology，Huainan，Anhui 232001，China) |
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Abstract The disorderly propagation of cracks formed by the traditional drilling blasting is liable to cause gas dynamic disasters when encountered with the tectonic coal and rock. Tunneling in structural coal and rock with directional concentrated energy blasting is studied in this paper. The mechanical model of rock fracturing under shaped energy blasting is established and the crack initiation and propagation under shaped energy blasting and ordinary blasting are compared and analyzed. The comminuted zone formed by shaped energy blasting and ordinary blasting and the multiple relations of peak stress are obtained. A blasting experimental platform for simulating ground stress and gas pressure was set up，the coal and rock blocks containing structural weak coal seam were constructed，and the modelling experiments under common blasting and shaped blasting were carried out. The experimental results show that the crushed area formed in the shaped energy direction is 0.838 times of that in the same direction under the ordinary blasting，the peak stress value is 1.58 times of that of the ordinary blasting. Compared with that of the ordinary blasting，the period of static action of the explosive gas was prolonged 300 μs in the direction of shaped energy，and was shortened 250 μs in the direction of non-shaped energy. The crack propagation range in the shaped energy direction is increased and the crack propagation range in the non-accumulative energy direction is reduced. The blasting efficiency was improved when the shaped blasting was applied to the tunneling in structural belt. The damage degree to supporting rock mass and structural coal was reduced，and the gas dynamic disaster accident induced by blasting excavation was restrained.
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2018, Vol. 37 
