Blast Effect in Prestressed Fractured Rock Massif at Driving of Mine Workings and Railway Tunnels
The article describes the mechanism of blast effect at driving of mine workings and railway tunnels in prestressed fractured rock massifs. Areas of blast effect are considered in the article. The area of flaws causes decreased stability of the massif within the envelope of the mine working. The area of blast residual stress causes rock slide within the envelope of the mine working and destruction of tunnel lining. It is necessary to use special technology or to drive mine workings and tunnels mechanically in order to reduce adverse effect of blasting