Jinneng Holding Coal Industry Group Majiliang Mine

为解决马脊梁矿+980m水平胶运大巷岩石硬度较高、整体割岩速度缓慢的问题,提出采用多孔水力压裂技术进行辅助破岩的快速掘进技术及工艺,利用数值模拟方法对双孔水力压裂裂缝的耦合规律进行研究,比较不同孔间距的效果,确定0.8m的双孔水力压裂孔间距具有较好的效果。通过仿真分析平行阵列式、交错式1、交错式2三种不同的压裂孔布置形式对裂缝扩展的影响,结果显示平行阵列式的效果最好。最后,通过对掘进工作中多孔水力压裂技术的实践,选用0.8m的孔间距和75~90mm的压裂孔径的效果最优。与优化前的作业效率对比可以看出:每排割岩时间可以减少约40min,相当于节约了25%的割岩时间。每日进尺也从原来的4.6m提高到5.5m,既提高了工作效率,又预留了充足的维修时间。

To solve the problem of high rock hardness and slow overall rock cutting speed in the +980 m horizontal glue transportation main roadway of Majiliang Mine, a rapid excavation technology and process using porous hydraulic fracturing technology to assist in rock breaking is proposed. The coupling law of double hole hydraulic fracturing cracks is studied using numerical simulation method, and the effect of different hole spacing is compared. It is determined that a 0.8 m double hole hydraulic fracturing hole spacing has a relatively good effect. Through simulation analysis of the impact of three different types of fracturing hole arrangement forms, namely parallel array type, staggered type 1, and staggered type 2, on crack propagation, the results show that parallel array type has the best effect. Finally, through the practice of porous hydraulic fracturing technology in excavation work, the optimal effect is achieved by selecting a hole spacing of 0.8 m and a fracturing aperture of 75-90 mm. Compared with the operation efficiency before optimization, it can be seen that each row of rock cutting time can be reduced by about 40 minutes, which is equivalent to saving 25% of rock cutting time. The daily footage also increases from 4.6 m to 5.5 m, which not only improves work efficiency but also reserves sufficient maintenance time.