基于钻孔应力法的巷道卸压带宽度考察研究  

Investigation and research on the width of roadway pressure relief belt based on drilling stress method

作　　者：姚学庆 郭艳飞 YAO Xue-qing;GUO Yan-fei(Jiaozuo Coal Industry(Group)Co.,Ltd.,Institute of Science and Technology,Jiaozuo 454000,China)

机构地区：[1]焦作煤业(集团)有限责任公司科学技术研究所,河南焦作454000

出　　处：《煤炭科技》2022年第3期19-23,28,共6页Coal Science & Technology Magazine

摘　　要：为了进一步提高巷道卸压带宽度考察的准确性,解决瓦斯参数法测定结果差异不明显、区分卸压带范围困难的难题,基于煤层巷道围岩应力动压变化特征,提出利用钻孔应力法进行卸压带宽度测定,并在赵固二矿14030回风巷开展现场试验。实验结果表明:煤层巷道成巷后,围岩应力处于动压变化状态,在巷道不同深度处安装钻孔应力计,可观测到较为明显的应力变化,实现对巷道卸压带宽度测定的目的;利用钻孔应力法考察赵固二矿14030回风巷距巷帮15 m位置为卸压区、18 m位置进入应力集中区、21 m位置为原始应力区;采用瓦斯含量法、钻屑法同步考察,验证了该方法测定结果的可靠性,为巷道卸压带宽度考察提供借鉴。In order to further improve the accuracy of the investigation of the width of the roadway pressure relief zone,and to solve the problems that the gas parameter method does not have obvious differences in the measurement results and it was difficult to distinguish the pressure relief zone range,based on the dynamic pressure change characteristics of the surrounding rock stress in the coal seam roadway,it was proposed to use the borehole stress method.The width of the pressure relief belt was measured,and a field test was carried out along the 14030 upper groove of the Zhaogu No.2 Mine.The experimental results showed that:after the coal seam roadway was formed,the surrounding rock stress was in a state of dynamic pressure change.By installing borehole stress gauges at different depths of the roadway,obvious stress changes could be observed,and the purpose of measuring the width of the roadway pressure relief zone could be achieved;The drilling stress method was used to investigate the 14030 upper trough of Zhaogu No.2 Mine,which was 15 m away from the roadway as the pressure relief area,18 m into the stress concentration area,and 21 m as the original stress area;the gas content method and the drilling cutting method were used to synchronize.The investigation verified the reliability of the measurement results of this method,and provided a reference for the investigation of the width of the roadway pressure relief belt.

关 键 词：瓦斯 巷道 卸压带 钻孔应力 

分 类 号：TD713.1[矿业工程—矿井通风与安全]