尺寸效应影响的抽采孔周煤体分区渗透特征

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中图分类号：TU443 文献标志码：A 文章编号：1008-0562（2026）02-0137-09

Abstract：To elucidate the influence of gas channel permeability resistance around dual-prevention boreholes in coal mines with compound disasters of coal and gas outbursts and rock bursts，triaxial permeability tests were conducted on single-graded and composite specimens with varying heights.Analyzing the relationship between permeability and specimen height，revealed the size effect of permeability.The head loss along the flow path model was introduced to characterize permeabilityconsidering the frictional head lossalong the flowpath （CFR）. The zonal permeability characteristics within the influence area of dual-prevention boreholes were clarified.The results indicate that the primary mechanism behind the permeability size effect is the intensification of inertial effects with increasing seepage channel length.Permeability characterized by the CFR，which accounts for this inertial effect，can be used to identify dominant gas migration pathways.The studyconfirms that coalmass size is a key factor influencing afecting permeabilitycapacity，providing a theoretical basis for optimizing borehole layout and enhancing gas extraction efficiency.

Keywords：dual-prevention boreholes; seepage resistance;permeability;coal size;broken specimen; composite specimen

0引言

岩松动影响，煤层内产生大量应力状态不同、裂隙发育不一、破坏状态各异的煤体[3]。（剩余17356字）