Study On The Effect Of Blasting Vibration On Roof Stability Of Underground Construction

In all the factors that affect the roof stability, blasting vibration is a very important one. The research based on the blasting vibration test and the roof's internal sound wave test in No.6301 underground stope of Tong Lu Shan mine in DaYe, HuBei, through the devices of modern science, adopted the correct test method based on actual circumstance on the spot, closely contacted the regulation of underground attenuation of vibration with the change of the speed of acoustic and how the joints and fissures developed, after analyzing and researching the test results, revealed the regulation that blasting vibration how to influence on the stability of the roof of the underground construction. Put forward to the measures how to lower the influence of blasting vibration on the roof stability. The main points are:(1) Testified the characteristic that the regulation of blasting vibration of upper is different from that of underground.(2) Based on the technology of acoustic measurement, this paper comparatively ascertained the internal joints' and fissures" location of roof rock mass, and the rough configuration of the structural homogeneity.(3) synthetically analyzed the influence of the maximum PPV, average PPV and the last time of blasting vibration on the sound wave speed inside the rock mass of the stope roof.(4) Established the evaluation criterion of dynamic stress ratio of blasting vibration based on controlling development of joints and fissures in the roof rock mass of underground construction, which expanded criterion to sightless damnification inside of the rock mass. From quondam criterion for visible damnification(5) According to the evaluation criterion of dynamic stress ratio ofcontrolling the vibration endanger in development of joints and fissures in the underground construction roof, put forward a new calculating method to calculate biggest maximum quantity of sectional charge (rational quantity of charge) in exploder design of underground construction. (6) From the view of developing the astigmatic ability of the roof underground construction, this article briefly discussed the mechanics and functions of support and reinforces to control the roof stability.