松软低透煤层水力自增压造穴技术及钻具研制

doi:10.11799/ce202511028

Abstract

Abstract:

Aiming at difficulties for coal roadway supporting in three soft coal seams of Zhengzhou mining area, occurrence characteristics and formation mechanism of three soft coal seam is explained, and the causes for supporting instability in three soft coal roadway is analyzed. The mechanism of bolt support is revealed based on the principle of composite arch beam, and it’s proposed that, coal seam bolt performance, bolt preload, mesh strength, quick installation process and immediate support are the key for three soft coal roadway supporting. On this basis, the thick coal seam bolt-mesh supporting is designed for 22011A coal face transport roadway of Chaohua Coal Mine. The result shows that maximum roof separation at shallow and deep basis points are 48 mm and 52 mm, the maximum roof-to-floor and side-to-side convergence are 372 mm and 310mm, the supporting section of roadway is maintained．

CLC Number:

TD41

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Hydraulic Self-Pressurization Cavity Creation Technology and Development of Drilling Tools for Soft and Low-Permeability Coal Seams

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