Method for preventing vibration of smooth blasting in tunnel

Abstract

The invention relates to a method for preventing vibration of smooth blasting in a tunnel. The method comprises the following step of drilling a plurality of shock absorbing holes and a plurality of shock absorbing grooves in a spaced manner in a smooth blasting area in the tunnel, wherein each shock absorbing hole is located between twoadjacent peripheral holes and each shock absorbing groove islocated between two adjacentperipheral holes; furthermore, the shock absorbing holes are formed in the sides, far away from the earth surface, of the peripheral holes, the connecting distance betweeneverytwo adjacent peripheral holes is L, the vertical distance of connecting lines between the shock absorbing hole and the two corresponding adjacentperipheral holes is S which is equal to 0.4L; andeach shock absorbing holeis located inthe midperpendicular of a connecting line of the two corresponding peripheral holes. According to the method, construction on the earth surface is avoided and theshock absorbing effect is good. By forming the shock absorbing holes and the shock absorbing grooves in a spaced fit manner, part of energy generated byexplosive after exploding is absorbed by the shock absorbing holes and the shock absorbing grooves in peripheral hole blasting, so that the upward propagated energy can be reduced, and vibration and damage tothe earth surface are reduced.

Description

technical field [0001] The invention belongs to the technical field of blasting engineering, and in particular relates to a method for protecting smooth surface blasting vibration in a tunnel. Background technique [0002] Blasting vibration is a major hazard caused by blasting construction. Compared with blasting hazards such as flying stones, shock waves, and dust, it is unavoidable and has a wide range of influence. Its main hazards are surface buildings and so on. With the development of urban traffic at the present stage, it is more common for urban subway tunnels to pass under buildings, especially buildings with high vibration requirements such as schools and hospitals. For the vibration reduction methods and technologies of blasting micro vibration The need is imminent. Peripheral holes are blastholes located in the outermost circle when tunnel blasting is performed. In tunnel smooth blasting, the main blasting area and the light blasting area are detonated twice. ...

AI Technical Summary

Problems solved by technology

Although the above method can solve the hazards of blasting vibration caused by blasting construction, since the vibration-damping trenches and multiple rows of vibration-damping holes need to be set on the ground surface instead of in the tunnel, the complexity of the traffic conditions on the ground surface and the buildings will affect the vibration reduction. Trench construction creates uncertainty

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