EFFECT OF BLASTING ON STRESS STATE IN THE ROCK AROUND THE TUNNEL
Keywords:nổ mìn, mô đun biến dạng, trạng thái ứng suất, độ bền, kết cấu chống
Build tunnel in hard rock, usually using the drill-blasting method to break the tunnel stone. After blasting and shoveling, the gaps will receive gaps within the boundaries as required by the design. The rock mass surrounding the tunnel outside the boundary is not destroyed, but the crack is generated, the Stick force C and the frictional internal angle φ of the rock mass decreases, so that the strength of the rock decreases as compared to before the explosion mine. The level of rock durability is dependent on the blasting technology. This article examines the change of rock deformation due to blasting, which examines the impact of blasting on the stresses in the rock around the tunnel.