Tunnel Cutting Charge Design Method Based on Composite Calculation of Porous Differential Blasting Vibration

Abstract

The invention discloses a tunnel slotting dose design method based on porous millisecond blasting vibration synthesized calculation. The tunnel slotting dose design method is suitable for city shallow-buried tunnel low vibration accurately-controlled blasting. The tunnel slotting dose design method based on the porous millisecond blasting vibration synthesized calculation includes the steps that single hole single free surface site blasting with different doses is performed, corresponding vibration data are measured, and the dose range is tentatively decided; a dose vibration curvilinear function is fitted; the delayed range of all sections of a sample detonator is actually tested; forming time t<s> of a second free face is determined, and t<s> is compared with the delayed range of all sections of the detonator to determine the number N of blasting sections for hole-by-hole slotting; the optimal algorithm is designed, and with the single hole fitting vibration curve as a vibration source and with 1ms as millisecond interval increment, all possible synthesized vibration curves of the delayed range of all sections are calculated through an MATLAB program during N section hole-by-holeslotting blasting; and the maximum dose with the peak vibration speed unexceeding the standard is found from a time frame before the second free face is formed and is used as slotting dose. Comparedwith a traditional method, the maximum blasting dose and a blasting footage can be acquired on the premise of safe vibration speed unexceeding the standard.

Description

Technical field [0001] The invention relates to a method for determining the single-hole charge for tunnel cut blasting, which is mainly suitable for ensuring low vibration speed indicators and the determination of the single-hole charge for tunnel cut blasting in an urban environment. Background technique [0002] In recent years, the blasting vibration speed index of urban tunnels has become stricter. The key to blasting vibration control is the control of the charge. Reducing the single-stage charge can reduce the blasting vibration, but reducing the charge will reduce the tunnel's circular footage and construction efficiency. Therefore, if the construction efficiency is to be ensured while meeting the requirements of controlling the vibration speed, it is necessary to accurately calculate the best single-stage charge that can be used in blasting. [0003] In tunnel blasting, cutting hole blasting requires a large amount of clamping, and the maximum vibration velocity mainly o...

AI Technical Summary

Problems solved by technology

[0009] The method of the present invention is aimed at the requirements of tunnel blasting vibration velocity control, overcomes the shortcomings of the traditional Sadovsky formula method, which is inaccurate in calculation and does not consider the superposition of vibration velocity, and proposes a method for calculating the formation of the second free surface in tunnel cutting blasting. The method of the maximum single-hole charge dose under the front safety control vibration velocity

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