基于声波测试原理的爆破荷载对地铁隧道围岩扰动研究

基于声波测试原理，利用RSM-SY5（T）非金属声波检测仪对广州地铁隧道围岩在爆破荷载作用下产生的扰动进行现场试验。研究结果表明:非光面爆破方案爆破后，隧道围岩的松动圈范围约0.6～0.7 m，光面爆破方案爆破后，围岩的松动圈范围约0.3～0.5 m；岩体声波速度随着深度的增加而增加，达到某一深度后趋于平稳；岩体波速在平稳深度存在小范围的波动现象，说明岩体本身存在着不良地质结构，对波速产生了影响；炮孔装药结构和装药量对围岩的扰动程度具有一定的影响，空气间隔装药能明显降低扰动程度，装药量越大对围岩扰动程度越大。

Study on the Disturbance of the Surrounding Rock of Metro Tunnel by Blasting Load Based on Sonic Wave Testing Principle

The field test of disturbance of the surrounding rock of Guangzhou metro tunnel under blasting load is carried out by RSM-SY5 (T) non-metal acoustic detector based on the principle of sonic wave testing. The study shows that the range of loose circle of tunnel surrounding rock is about 0.6~0.7 m after non-smooth blasting, and after smooth blasting, the loose circle range of surrounding rock is about 0.3~0.5 m. The acoustic velocity of rock mass increases with depth and it tends to be stable after reaching a certain depth. The wave velocity of rock mass has a small range of fluctuation at a steady depth, indicating that the rock body has a bad geological structure, which has an effect on the wave velocity. The structure of blasting hole loading and the amount of loading have some influence on the disturbance degree of the surrounding rock and the air interval loading can significantly reduce the disturbance degree and the larger the loading quantity is, the greater the disturbance degree of the surrounding rock.