大断面锚网支护巷道应力分布规律

Stress Distribution Laws of Bolt-mesh Supporting Roadway With Large Cross Section

以潞安矿区大断面锚网支护煤巷为研究对象,采用理论分析研究巷道断面尺寸对巷道围岩稳定性的影响,并采用数值模拟软件FLAC2D研究巷道围岩应力分布规律,同时研究不同锚网支护参数条件下的围岩应力变化规律,研究得出:巷道围岩应力降低范围增加幅度和剪胀变形区域,随巷道宽度增加呈非线性增大趋势;锚杆长度增大改善深部岩体应力状态,减小剪胀变形区域。继而提出以高强度、高预紧力和大锚固范围为核心的技术方案。

Taking bolt and mesh supporting roadway with large cross section in Luhn Mining Area as research object. The paper studies the influence of roadwayg section size on roadway surrounding rock＇s stability by theoretical analysis. Meantime, it also researches sur- rounding rock stress distribution laws of coal roadway with FLAC2D, and the change laws of surrounding rock stress under situation of different bolt - mesh supporting parameters. The research result is that the range of stress reduced and shear deformation is growing by nonlinear with roadway cross increasing. Besides, the long bolt improves the stress of depth rock and reduces the distribution of shear deformation. At last, the paper provides technical scheme that takes high strength, high pretension and large reinforced area as core.