Tunnel Blasting Vibration Reduction via Wave Interference
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Solution Overview
Problem
Tunnel blasting in underground environments generates significant vibrations, which can damage surrounding rock masses and nearby buildings, despite the use of millisecond blasting technology.
Innovation Solution
The method involves dividing cutting holes into groups, conducting layout and test blasting, and calculating an interval t, where t=T/2, to superpose the peaks and troughs of vibration waves, thereby canceling out mutual vibrations during formal blasting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the charge of blast hole is increased to improve cutting effect, then the cutting efficiency is improved, but the blasting vibration increases which damages surrounding buildings
Solution Approach 1:
The cutting holes are divided into multiple groups (first group, second group, third group) that are detonated at different times. This segmentation of the blasting sequence allows the total charge to be distributed across time, maintaining cutting effectiveness while reducing peak vibration levels that would occur with simultaneous detonation of all holes.
Solution Approach 2:
The blasting operation employs periodic detonation of different hole groups with specific time intervals between them. This periodic action creates a controlled vibration pattern where subsequent blast waves can interfere destructively with previous ones, reducing overall vibration amplitude while maintaining the cumulative cutting effect.
2Object-affected harmful factors
If millisecond blasting technology is used to reduce blasting vibration, then the vibration control is improved, but the cutting effect deteriorates due to insufficient compensation space for collapsed rocks
Solution Approach 1:
The blasting sequence is segmented into distinct phases: first group cutting holes create initial fractures, then second and third groups follow with time intervals that allow rock collapse and space formation. This segmentation ensures sufficient compensation space is created progressively without requiring all holes to fire simultaneously, thus maintaining cutting effectiveness while controlling vibration.
Solution Approach 2:
The first group of cutting holes is detonated first to create preliminary fractures and opening in the rock mass. This preliminary action prepares the rock structure for subsequent blasting, allowing later groups to more effectively create compensation space and remove rock with reduced vibration levels.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces blasting vibrations, balances vibration levels, minimizes damage to surrounding structures, and enhances the reliability and efficiency of the blasting process.
Implementation Method 1
The use of the characteristics of the wave is used in the method for reducing blasting vibration of tunneling proposed by the present invention, to ensure that the interval t of two sections of blast holes is T/2, thereby superposing the peaks and troughs of the vibration wave, and further canceling out mutually.
Data Source
AI summary
A method for reducing blasting vibration of tunneling includes the steps of: dividing the cutting holes into several groups according to different cutting methods; conducting layout and test blasting on one group of cutting holes; testing blasting parameters for the layout and test blasting; calculating an interval t; conducting layout and test blasting on at least two groups of cutting holes again; testing blasting parameters for the layout and test blasting of each group for the second time; taking the minimum interval t of each group as the interval for formal blasting of the remaining groups of cutting holes. The use of the characteristics of the wave in the invention can superpose the peaks and troughs of the vibration wave, and further cancel out mutually; reduce the peaks of the blasting vibration and fill the troughs of the blasting vibration.