A construction method of micro-differential networking outside the hole for vibration-reducing blasting of underground excavation tunnels

Abstract

The invention discloses an out-of-hole micro-differential networking construction method for vibration-reducing blasting of underground excavation tunnels. The method includes arranging in-hole detonators and out-of-hole detonators according to blasthole parameters and networking parameters, and any adjacent two segments in the plurality of segments are connected in series through an out-of-hole detonator, and each segment includes a plurality of A blasthole and a plurality of in-hole detonators, each of the plurality of blastholes is connected to the first end of one of the plurality of in-hole detonators, and each segment includes a plurality of holes The second end of each inner detonator in the inner detonator is connected in parallel through an outer detonator. The invention solves the problem of unstable blasting in the construction method of micro-differential networking in the hole and the construction method of simultaneous micro-differential networking inside and outside the hole.

Description

technical field [0001] The invention relates to the field of blasting construction of underground excavation tunnels by a mining method, in particular to an out-of-hole differential networking construction method for vibration reduction blasting of undercut tunnels. Background technique [0002] At this stage, the urban subway underground tunnel is typical. The surrounding environment of the underground excavation and blasting project is becoming more and more complex, and blasting safety risks such as blasting vibration are paid more and more attention. Vibration reduction blasting is also a fundamental factor restricting the construction progress and construction safety. In the underground excavation and blasting environment, it is very necessary to study the vibration reduction blasting construction. [0003] In the prior art, the traditional mining method tunnel smooth blasting method generally adopts the in-hole differential method, and the smooth blasting method is use...

AI Technical Summary

Problems solved by technology

[0006] When dealing with vibration-reducing blasting, the disadvantage of the limited number of conventional non-electric millisecond detonators is more prominent. In order to control the vibration velocity, it is necessary to reduce the amount of single-stage priming charge correspondingly, and the reduction of single-stage priming charge will lead to poor single-stage blasting effect. One-time blasting is often difficult to meet the construction requirements, and it needs to be solved by multiple blasting methods. If the hole differential network construction method is adopted, the debris generated by the previous blasting will affect the subsequent blasting line, and the blasting stability is poor. At the same time, the construction method of differential network, the construction process is extremely complicated, and the problem of poor blasting stability still exists, which has a negative impact on factors such as safety, construction period and benefit.

[0007] Aiming at the problem of unstable blasting in the construction method of micro-differential network in the hole and the simultaneous micro-differential network construction method inside and outside the hole in the existing technology, no effective solution has been proposed so far.

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