特厚煤层大断面巷道支护设计及分析

在特厚煤层中掘进的巷道，巷道周围围岩均是煤岩。为了进一步研究特厚煤层中巷道周围煤体的变形和破坏特征，确定合理有效的支护形式和支护参数，保证煤矿的安全顺利生产，选取南阳坡5#煤层中的1条巷道为研究对象，巷道断面形式为圆弧拱形，宽4.3 m，弧顶高度3.4 m，为大断面巷道。在确定巷道断面形状和尺寸的基础上，对巷道进行支护设计，并结合现场监测和数值模拟方法，确定了锚-网-索支护方案。工程实践表明：该方法能够有效的控制巷道周围煤岩的变形，支护效果好，两帮和顶板的位移得到了有效的控制，巷道变形短期内即趋于平稳。且支护成本大大降低，支护采用锚杆锚索，减少了支护所用时间。该支护方法具有较高的应用价值，应积极推广应用于生产。

Support Design and Analysis of Large Section Roadway in Extremely Thick Coal Seam

For roadway driven in extremely thick coal seam，there are all coal seam around surrounding rock.In order to further study the deformation and failure characteristics of coal mass in extremely thick coal seam，to determine the effective support forms and parameters and ensure the safety in production，a roadway at Nanyangpo No.5 coal seam is chosen as a research object.It is a large section roadway with cross section form of circular arch 4.3 m wide and roof 3.4 m high.On the basis of determination of the roadway shape and size，roadway supporting design is made.Combining with the field monitoring and numerical simulation，an anchor-mesh-cable support is proposed.Engineering practice shows that：this method can effectively control the deformation of coal rocks around the roadway with good supporting effect.The two-side and roof displacements of roadway have been effectively controlled.The roadway deformation is leveled off in the short term.As well，the supporting cost is greatly reduced and the support period is reduced with anchor rod and anchor cable.This support method owns a high practical value and should be actively popularized in production.