围岩松动圈理论在巷道锚杆支护中的应用

Application of surrounding rock loosing-circle theory in roadway bolt support

利用矿式超声波测试仪 ,测出围岩松动圈 ,进而选择合适的锚杆种类 ,以取得最佳技术 。

Measuring the loosing_circle with supersonical surveying instrument,and choicing suitable kind of bolts so as to obtain optimum technology and economical result are introduced.