A Design Method of Tunnel Blasting Parameters Based on Digital Electronic Detonator Initiation

Abstract

The invention provides a tunnel blasting parameter design method based on digital electronic detonator initiation. The method is particularly suitable for tunnel blasting with high safety vibration speed control requirements; the method is based on the initiation characteristics of the digital electronic detonator; actual blasting vibration attenuation characteristics are fully considered; under the combined action of various parameters such as different dosages, different hole numbers and different millisecond time, a vibration synthesis curve is solved by utilizing a vibration wave synthesistheory and a calculation program; a set of complete method for designing blasting parameters such as the maximum single-hole explosive quantity, the optimal inter-hole millisecond time, the millisecond time between the adjacent holes of the cut holes and the adjacent holes of the auxiliary cut holes, the auxiliary hole explosive quantity and the optimal millisecond time is provided; therefore, the performance advantages of the digital electronic detonator can be exerted to the maximum extent, and meanwhile efficient footage and vibration control are achieved. Efficient footage and vibration control can be achieved at the same time in urban tunnel blasting.

Description

technical field [0001] The invention relates to a blasting parameter design method, which is mainly aimed at the tunnel blasting excavation project using digital electronic detonator to detonate. Background technique [0002] The application of digital electronic detonator is a major progress in engineering blasting, and it represents the development direction of blasting technology. Compared with ordinary detonators, the delay accuracy of digital electronic detonators is increased by more than 10 times, and the number of initiation stages is increased by hundreds of times. The use of digital electronic detonators in tunnel excavation can significantly reduce blasting vibration. In the past ten years, the use of digital electronic detonators in tunnels, especially urban tunnels, has been increasing, and most of them have achieved good blasting and vibration reduction effects. [0003] Although the performance indicators of digital detonators are very advanced, their charact...

AI Technical Summary

Problems solved by technology

Take the key parameters of tunnel blasting design, the amount of primary charge and the delay time difference (most of the other parameters can be deduced accordingly): the former is still calculated according to the Saxalloy formula, and the calculation results are highly discrete and often inconsistent with the actual situation; for The time delay design method between holes is divided into two categories: one is determined based on engineering experience combined with field tests, and this method needs to be adjusted several times according to specific projects, which is relatively cumbersome and not universally applicable; Periodic misphase vibration reduction calculation method simplifies the vibration waveform to a cosine wave with damping, but the actual blasting vibration waveform is not strictly a periodic wave, and the complex variability of underground rock mass leads to random blasting vibration waves, and its applicability To be further verified

Moreover, the above methods are all aimed at the study of the characteristics of a single parameter. The parameters of tunnel millisecond blasting affect each other, and there are complex coupling relationships among differential time, single-hole charge, blasting hole number and vibration velocity superposition, and considering multi-parameter interaction Design methods that affect the

[0004] Some scholars have calculated the synthesis of differential blasting vibration based on the vibration waveform of single-hole blasting in the field, and based on this, they have designed the method of blasting parameters. However, the delay error of ordinary detonators is large. Some research documents have measured the delay range of sample detonators before blasting. The data calculates the possible synthetic vibration combinations within the range of the differential delay, and designs the dose in the most unfavorable situation. However, because the delay of the stage is fixed, the delay time cannot actually be designed; and when calculating the dose, only all possible delays can be taken. The minimum amount of explosives is used to ensure safety, but it is still not suitable for precise control of blasting with digital detonators

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