复杂顶板条件下巷道合理支护参数研究

Research on reasonable supporting parameters of roadway with complex roof

葛泉矿1192工作面巷道顶板包含8~#和9~#两层煤及夹矸,顶板条件复杂多变,巷道支护参数的设计和稳定性存在难题。通过FLAC3D数值模拟软件分析了薄顶煤型和厚顶煤型两类顶板结构巷道围岩塑性区分布特征,当顶板由薄顶煤型变为厚顶煤型时,顶板围岩破坏深度随之增大,两帮和底板的破坏深度不变,顶板破坏深度最大值2.5 m,帮破坏深度最大值2 m。结合塑性区特征和悬吊理论提出合理支护参数,结果表明煤帮松动圈范围0.6~0.7 m,顶板和两帮位移量60~80 mm,巷道变形量小,基本能够维持稳定。

The roadway roof of No.1192 working face of Gequan Coal Mine was constituted by No.8 and No.9 coal seam and partings,which had complex structure and had difficulties in design of stable supporting parameters.The distribution characteristics of plastic zone in surrounding rocks of roadway with thin top-coal or thick top-coal were analyzed by utilizing the numerical simulation software FLAC3 D,which indicated that the roof damage depth was growing while the damage depth of two sides and floor were unchanged when the top-coal of roof changed from thin to thick.The maximum damage depth of roof was 2.5 m and the two sides was 2 m.The reasonable supporting parameters of roadway were determined by analyzing plastic zone characteristics and suspensory theory,the results showed that the broken rock zone ranged from 0.6m to 0.7 m to the coal wall,and the displacements of roof and two sides ranged from 60 mm to80 mm,the roadway deformation was not large and the supporting parameters could maintain the stability of roadway.