Tunnel Excavation Blasting Method Using Detonator Short Time Difference and Hole Vibration Reduction Technology Comprehensively

Abstract

The invention discloses a tunneling blasting method comprehensively utilizing the detonator short time difference and an empty hole vibration reduction technique. The center line of a tunnel face of ablasted tunnel serves as the boundary, and the blasted area is divided into a left region and a right region, wherein the left region and the right region are symmetrical to each other; the two sidesof the center line are provided with a plurality of slotting holes, auxiliary holes and peripheral holes correspondingly, wherein the slotting holes, the auxiliary holes and the peripheral holes aresymmetrical to one another, a vibration reduction hole linear array is arranged on the ground between the blasted area and a building, and in the implementation process, the same row of holes are blasted hole by hole in a symmetrical and delayed manner. Hole-by-hole sequential blasting is performed through electronic detonators, and targeted to different types of blastholes, through the setting ofthe optimal delay time of the electronic detonators, vibration waves transferred to the ground interfere with one another and are counteracted partially; and meanwhile, vibration reduction holes of optimized design are formed on the ground, and 50% of blasting vibration can be effectively lowered. Through the combined measure, the blasting effect of a constructed smooth surface can be guaranteed,the defect that traditional smooth surface blasting is large in vibration can also be overcome, and finally influences on the surface buildings are reduced.

Description

technical field [0001] The invention belongs to the technical field of blasting, and in particular relates to a tunnel blasting method capable of reducing ground blasting vibration, in particular to a tunnel excavation blasting method which comprehensively uses detonator short time difference and hollow hole vibration reduction technology. Background technique [0002] In the construction of tunnels and other underground operations in cities, due to the complex and changeable geological conditions, it is inevitable to encounter various rock conditions. If complete and hard rock conditions are encountered during tunnel excavation, due to the low efficiency and high cost of mechanical excavation, the drill and blast method with outstanding advantages such as high construction efficiency and fast construction progress is often used for construction. However, during the blasting construction process in the tunnel, there will be hazards such as noise, flying stones, poisonous gas...

AI Technical Summary

Problems solved by technology

However, during the blasting construction process in the tunnel, there will be hazards such as noise, flying stones, poisonous gas, dust and seismic waves. It evolves into a compressive stress wave that propagates along the rock-soil medium to the lining of nearby buildings, and the compressive stress wave will undergo complex diffraction, transmission and reflection phenomena at the lining of the building. At this time, if it is a building that is sensitive to vibration Due to the possibility of damage due to the action of compressive stress, shear stress and tensile stress, the seismic waves generated by blasting vibration will inevitably have adverse effects on surrounding buildings or facilities. How to overcome the impact of underground blasting on ground buildings as much as possible Impact becomes a technical problem

[0003] The application number is 201410710171.3 Chinese patent "tunnel smooth blasting method" discloses a tunnel smooth blasting method, including cutting, blasting, etc., in the case of meeting the half eye rate and footage, reducing the bottom plate holes, reducing costs and improving efficiency , but the blasting method does not involve reducing the blasting vibration

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