巷道掘进扰动效应影响因素研究

Research on influencing factors of excavation disturbance

深部开采条件下,后掘巷道对先掘巷道掘进扰动影响较大。针对巷道围岩强度、水平距离、垂直距离等影响巷道掘进扰动效应的因素,采用数值模拟和现场实测等手段进行研究。结果表明:岩体内摩擦角和内聚力的增加能够有效削弱巷道间的扰动效应,而抗拉强度对于掘进扰动几乎没有影响;5倍硐径间距以上时,相较于巷道间垂直距离,水平距离的增加能够显著减弱巷道间的掘进扰动效应;水平距离增加对掘进扰动的削弱效应在竖直方向上分布不同,当先掘巷道位于后掘巷道上方时,水平距离的增加能够更为有效地减弱掘进扰动影响。在此基础上提出巷道群围岩控制的最优空间关系确定方法,对工程实践具有一定的指导意义。

In deep mining, the excavation disturbance is large. Such factors of excavation disturbance as strength of surrounding rock of roadway, horizontal distance, vertical distance have been discussed in this paper, adopting monitoring and numerical simulation results. The result indicates that the increase of the rock internal friction angle and cohesion can weaken disturbance effect of the roadway, while tensile strength is almost not affected to the excavation disturbance; in the roadways when the distance exceed 5 times of theirs diameter condition, compared to vertical distance, the increase of the horizontal distance can significantly weaken the excavation disturbance of soft rock roadways; In vertical direction, The distribution of the excavation disturbance effect is different accordingly. When early roadway is located above the later roadway, increase in the horizontal distance can weaken the excavation disturbance effectively. On this basis, the determination method is proposed for optimal spatial relationship of roadways, which has certain significance on engineering practice.