基于松动圈理论的破碎岩体锚杆支护参数确定及应用

锚杆支护计算理论的选取直接影响巷道围岩支护效果。针对锦丰金矿巷道围岩破碎条件,进行巷道围岩松动圈测试;根据松动圈测试结果确定选用组合拱理论为锦丰金矿锚杆支护计算理论,计算确定锦丰金矿巷道支护参数;并进行现场支护试验,同步监测锚杆受力情况,最终确定锦丰金矿巷道支护最优参数为:锚杆间距1.2m,锚杆排距1.2m,锚杆长度2.4m。工程应用结果表明:通过松动圈大小确定锚杆支护计算理论,可以使选取的支护理论更贴近矿山实际,对其他矿山的锚杆支护参数设计具有指导意义。

Determination and application of the bolt support parameters for broken rock mass based on loose circle theory

The selection of bolt support theory directly influences the surrounding rock support effect.Since the surrounding rocks are broken in Jinfeng Gold Mine,the loose circle test was carried out.According to the test results,the build-up arch theory was decided to be the bolt support calculation theory for Jinfeng Gold Mine,the roadway support parameter in Jinfeng Gold Mine are decided by calculation,field support test was carried out,the bolt stress conditions were monitored simultaneously and the optimum roadway support parameters in Jinfeng Gold Mine were decided as follows:the interval of bolts is 1.2 m,the row interval is 1.2 m,the bolt length is 2.4 m.Engineering practice shows that the determination of bolt support calculation theory by loose circle size can make the selected support theory more practical to the mine,and has guiding significance for the bolt support parameter design in other countries.