巨厚复合顶煤大断面煤巷支护参数优化

Damage mechanism and optimum support parameters for coal roadway with a large cross-section and thick combined top-coal

针对在大断面、巨厚复合顶煤条件下巷道支护参数难以确定的问题,通过采用钻孔窥视法和FEPG软件数值模拟方法对不连沟煤矿的巨厚复合顶煤特大断面全煤大巷进行锚杆(索)支护参数优化,提出在巨厚复合顶煤特大断面全煤大巷中采用高强度、大刚度的长锚杆和长锚索的联合支护方法,并对其支护效果进行监测,研究结果表明:该支护系统很好地保证了复合顶煤大断面煤巷的安全,可靠性较高。

To overcome the abnormal difficulty in roadway maintenance under the conditions of large cross-section and thick combined top-coal,this study analyzes the separation process of combined top-coal layers in a large cross-section coal roadway.It concludes that the destruction forms of roadway with thick composite top-coal are mainly separating and buckling.The deformation and movement of combined top-coal occur between each layer.Without roof support,the destruction process is mainly in three stages including slip,layer separation,falling and slipping down.Support parameters of a coal roadway with a large cross-section and thick combined top-coal are optimized using the methods of drillhole peep and FEPG software.A high intensity,high stiffness long anchor and anchor rope combined support is proposed in this study.The support results monitored show that the support system demonstrates an excellent safety characteristics and high reliability.