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中文摘要：
预裂效果是低渗透高瓦斯煤层深孔爆破增透技术的关键。采用超动态应变测试系统，实测了单孔起爆和双孔同时起爆作用下有机玻璃板中爆炸产生的应变波，对测试得到的轴向和切向爆炸应变波信号进行了分析。结果表明：单孔起爆产生的裂纹长度有限，双孔起爆由于应力波叠加作用产生的主裂纹长度扩展效果明显；应变波波形包括两个部分，首先以压缩为主的应变作用使裂纹产生，然后以拉伸为主的应变作用使裂纹长度扩展，且拉伸应变峰值是导致裂纹长度扩展的主要原因；双孔同时起爆爆炸拉伸应变峰值是单孔起爆的3～6倍，说明多点爆炸荷载对介质的作用并不是单纯的数值叠加。研究结果为进一步认识爆破破岩机理和爆破预裂技术提供新的试验依据。
英文摘要：
The presplitting effect was the key of anti-reflection technique in deep hole blas- ting in the coal seam with low permeability and high gas. Taking the super dynamic strain test system, the explosion strain waves produced by single-hole detonating or double-hole detonating in perspex sheets were measured, and the axial and tangential strain wave signals were analyzed. The results showed that the crack length caused by single-hole detonating was limited, while the extension effect of main crack length caused by double-hole detonating was obvious because of the additive effects of stress waves. The waveform of strain wave included two parts, first part was the crack formation primarily caused by compression strain effect, and the second part was crack length extension primarily caused by tensile strain effect, and the peak of tensile strain was the main reason of crack length extension. The tensile strain peak of double-hole detonating was 3~ 6 times as big as the peak of single-hole detonating, which explained that the effect of multi-point explosion load on medium was not a simple numeral superposition. The research results provided a new test basis to explore the rock breaking mechanism and presplitting blast technology.
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