坚硬顶板定向长钻孔水力压裂卸压技术开发及应用

doi:10.11799/ce202607011

Abstract

Abstract:

This study addresses the long breaking span and difficult caving of the hard thick sandstone roof in the No. 3 coal seam of Sangshuping No. 2 Mine by developing and applying a directional long-hole segmented hydraulic fracturing technology for roof pressure relief. Based on hydraulic fracturing theory, mechanical criteria for fracture initiation and propagation are established, revealing the formation and evolution of a penetrating fracture network in the roof. Field application on the 3311 working face, combined with microseismic monitoring, roadway deformation monitoring, and ground pressure analysis, verifies the effectiveness of the technology. The results show that it forms a complex 3D fracture network, reduces roof strength and stress concentration, shortens the suspended roof span, stabilizes roof separation and roadway deformation, lowers support resistance, and weakens and shortens the influence of ground pressure, thereby improving mining safety.

CLC Number:

TD325

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Development and application of pressure relief technology by directional long borehole staged hydraulic fracturing in hard roofs#br#

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