众所周知,工作面端头的支护必须完成三项任务:当必须拆出工作面出口处的巷道拱形支架的一部分构件时,应能稳定支架其余部分;必须防止围岩冒顶和片帮;防止倾斜煤层中的顶、底板移动。通过井下观察,巷道围岩中的松裂岩体可分成两类:裂缝岩体(图1左)及裂纹岩体(图1右)。 It is well-known that the support of face ends must fulfill three tasks: stabilizing the rest of the bracket when it is necessary to disassemble a part of the arched support of the roadway at the exit of the work surface; Tilt the top of the seam, the floor moves. Through downhole observation, the loose rock mass in the surrounding rock of the tunnel can be divided into two types: the fractured rock mass (Figure 1, left) and the cracked rock mass (Figure 1, right).