巷道掘进中是否发生岩石冒落事故取决于周围岩体的稳定性。巷道四周岩体的状态取决于地质特性和进行凿岩爆破时对巷道周围岩体的破坏程度。巷道周围的密集裂隙区宽度可能达到3米。随着开采工作的延深,以及为采用自行式设备而扩大巷道断面,地压增大,从而会降低巷道周围岩体的稳定性,注定会发生冒落事故。在同样的条件下用优质凿岩爆破法控制巷道周边是提高地下工程安全性的方向之一。研究表明,增加周边孔数量,减少其装 Whether or not a rock fall accident occurred in tunneling depends on the stability of the surrounding rock mass. The state of the rock mass around the roadway depends on the geological characteristics and the degree of damage to the rock mass around the tunnel during the rock blasting. Intensive crack zone around the roadway may reach a width of 3 meters. With the deepening of the mining work and the expansion of the roadway section for the use of self-propelled equipment, the ground pressure will increase, thus reducing the stability of the rock mass surrounding the roadway and will surely cause a fall accident. Under the same conditions, controlling the perimeter of roadway with high quality blasting is one of the directions to improve the safety of underground engineering. Research shows that increasing the number of perimeter holes reduces their loading