In order to solve the problem of mine pressure disaster and gas enrichment caused by hard roof hanging in deep gob-side entry retaining, the coordinated management of two disasters is realized. By means of theoretical analysis, numerical simulation and multi-mine field test, the layout of roof directional long boreholes and staged fracturing parameters are optimized, the integrated system of precision fracturing and three-dimensional extraction is constructed, and the synergistic mechanism of the two is analyzed. This technology can make the roof fracture expand directionally by 30-45 m, greatly reduce the frequency of high-energy vibration, increase the purity of gas drainage by 5 times, reduce the gas content and pressure by 27.05% and 37% on average, and increase the one-time hole-forming rate of drilling to 94.7 %. Directional hydraulic fracturing can simultaneously realize roof pressure relief and gas migration channel construction. The multi-purpose characteristics of one hole significantly improve the treatment efficiency and meet the mining needs of gob-side entry retaining under various geological conditions.
马维亮. 沿空留巷顶板定向水力压裂技术与瓦斯治理协同应用[J]. 煤炭与化工, 2026, 49(6): 102-106.
Ma Weiliang. Collaborative application of directional hydraulic fracturing technology and gas control in gob-side entry retaining roof. CCI, 2026, 49(6): 102-106.