典型地质条件深部岩巷锚杆长度的选择

Selection of bolt length in deep rock roadway under typical geological conditions

运用Flac 3d软件进行数值模拟,以淮北矿区许疃煤矿3238底抽巷为实例,模拟现场巷道的支护情况,当围岩巷道地质条件为砂岩时,观察围岩稳定性与锚杆长度之间的变量关系,当围岩锚杆长度由l=2400 mm减少到l=2000 mm,观察巷道围岩支护的变形情况,得出符合工程背景的合理支护形式。

This paper adopts Flac 3 d software for numerical simulation and takes the 3238 bottom pumping roadway in Xutuan Coal Mine,Huaibei Mining area as an example to simulate the supporting of site roadway.When the geology of surrounding rock of roadway is sandstone,I observe the variable relationship between the stability of surrounding rock and the bolt length.When the surrounding rock bolt length reduces from 2400 mm to 2000 mm,I observe the deformation of roadway surrounding rock supporting and conclude the reasonable supporting form in accordance with the engineering background.