Stress relieving effect of non-coupling blasting technique on high stress area
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摘要: 为了研究不耦合爆破技术在巷道高应力区域的卸压原理及效果，采用室内实验和现场验证相结合的方法开展了研究。研究结果表明：在承压试件的爆破实验中，爆破对承压试件具有明显卸压作用，但由于碎胀应力的存在使爆破后应力恢复速率有所升高，因此提出爆破与排粉预裂钻孔联合卸压方法。对现场高应力区域巷道帮部卸压效果进行验证的结果表明，该方法对缓解巷道近场高应力集中具有较好效果。Abstract: To investigate the stress relieving mechanism and the effect of the non-coupling blasting on the high-stress area in a coal tunnel, we carried out theoretical analysis and laboratory experiment, followed by in-situ verification and numerical simulation. The results show that, in the laboratory experiment, although blasting can obviously relieve its stress in specimen, the existence of the hulking stress results in increasing the stress recovery rate after the blasting. Therefore a stress relieving method was proposed which combines blasting and pre-splitting drilling with discharging pulverized coal; the verification of the stress-relieving effect on the roadway sides in the high-stress area shows that the method can effectively reduce the high-stress concentration near the roadway.
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Key words:
- stress-relieving blasting /
- stress concentration /
- aqueous medium /
- non-coupling blasting
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图 6 径向不耦合装药结构示意图
Figure 6. Schematic diagram of the radial non-coupling charge structure
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