Test on high pressure gas expansion rock fragmentation in hard rock tunnel

In order to solve serious blasting vibration problem of the traditional drilling and blasting method for tunnel construction, a new type of rock fragmentation technology—high pressure gas expansion rock fragmentation technology is provided. The values of vibration velocity and effect of rock fragmentation received from field tests by high pressure gas expansion rock fragmentation technology are compared and analyzed with that of traditional drilling and blasting method. The results show that high pressure gas expansion rock fragmentation technology has smaller values of vibration velocity than the traditional drilling and blasting method at the time of construction. The results also prove that it is feasible to use this technology in tunnel projects and the problem of high vibration risk by traditional drilling and blasting method in the tunnel could be resolved through high pressure gas expansion rock fragmentation technology. The high pressure gas expansion rock fragmentation technology provides a new way for relevant engineering projects to break rocks.