高压水射流分段连续冲孔卸压增透技术

Piecewise Continuous Flushing Pressure Relief Antireflection Technology Based on High-pressure Water Jet

摘要: 在分析水射流破岩及增透的基础上，研发了WSZ16/45-200型瓦斯抽采孔水力作业机及相应的水射流喷嘴，提出了分段冲孔进入-连续冲洗退出的技术思路，确定了水射流连续冲孔进入步距理论方程。在中马村矿27021回风底抽巷揭煤试验表明，使用瓦斯抽采孔水力作业机进行水力冲孔出煤量是常规水力冲孔的1.3~1.8倍，冲孔完成后，煤层瓦斯含量由13.32 m³/t降至7.69 m³/t，揭煤期间△h₂为0~137.2 Pa，S值在1.3~2.4 kg/m，q最大为3.48 L/min，顺利揭开石门。

Abstract: On the basis of the analysis of water jet rock breaking and antireflection, WSZ16/45-200 type gas extraction hole hydraulic rig and corresponding water jet nozzles were developed, the technology idea of piecewise flushing in-continuous flushing out was proposed, and the interval theory equation of the water jet continuous flushing was determined. The uncovering coal test in 27021 bottom return air pumping lane of Zhongmacun Coal Mine showed that the coal output was 1.3 to 1.8 times of the quantity of conventional hydraulic flushing by using gas extraction hole hydraulic rig, after flushing, the coal seam gas content decreased from 13.32 m³/t to 7.69 m³/t, △h₂ was 0 to 137.2 Pa during uncovering coal,S was 1.3 to 2.4 kg/m, the maximum of q was 3.48 L/min, thus the rock cross-cut was uncovered successfully.