裸孔段长度对型煤致裂形态的影响规律研究

Study on Influence Rules of Bare Hole Length on Crack Morphology of Briquette

为探索不同裸孔段长度对型煤致裂形态的影响规律,开展真三轴岩石高压气体冲击致裂实验,设置不同裸孔段长度,结合声发射监测系统,得到不同裸孔段长度的岩石致裂形态和声发射响应特征。实验结果表明:当裸孔段长度为20mm时,更易产生单一的贯穿裂纹,被致裂破坏部分占整个试样的比例大,裸孔段为15mm时,产生的裂纹种类较多,形成的裂隙网络更加复杂。研究结果可为煤岩体致裂增透应用提供基础数据,保障煤矿生产安全。

In order to explore the influence rules of different bare hole lengths on the cracking morphology of briquette,the true triaxial cracking experiment on rock gas impact under high pressure was carried out.The characteristics of rock cracking morphology and acoustic emission response under different bare hole lengths were obtained by setting different bare hole lengths and combining with acoustic emission monitoring system.The experimental results show that when the length of the bare hole section is 20mm,it is more likely to produce a single through crack,and the proportion of the cracked part is large in the whole sample;and that when the length of the bare hole section is 15mm,there are more kinds of cracks,and the formed fracture network is more complex.The research results can provide basic data for the application of cracking and antireflection of coal and rock mass and guarantee the production safety in coal mines.