Patent ID: 11920472
Assignee: CHINA RAILWAY ELEVENTH BUREAU GROUP CO., LTD
Field: Other special machines (Mechanical engineering)
Classification: CPC E  F | IPC E

Claim 0:
1. A millisecond time control method for excavation blasting of a tunnel, comprising:
step 1: acquiring physical and mechanical parameters of a rock on an excavation working surface of the tunnel, establishing a millisecond blasting model according to the physical and mechanical parameters, and designing four different dimensions of blasting parameters of explosive quantity, a hole number, an inter-hole millisecond, and an inter-row millisecond;
step 2: simulating, based on the millisecond blasting model, a blasting process of an explosive package in the tunnel using the blasting parameters, to obtain a blasting vibration curve;
step 3: obtaining single-hole blasting vibration waveforms of the tunnel, and solving a vibration synthesis curve according to the single-hole blasting vibration waveforms of the tunnel by using a vibration synthesis theory;
step 4: comparing the vibration synthesis curve with the blasting vibration curve to obtain a coupling relationship of the blasting parameters, comprising:
performing mode decomposition on the vibration synthesis curve and the blasting vibration curve; and
calculating information gains of decomposed vibration signals, and using the information gains as coupling coefficients to obtain a coupling relationship matrix; and

step 5: screening out a target blasting parameter set based on the blasting vibration curve of the step 2 and using a safety vibration velocity as a restraint condition, and determining a target group of a single-hole explosive quantity and the hole number according to a size of the excavation working surface of the tunnel and the target blasting parameter set;
obtaining a vibration synthesis curve corresponding to the target group of the single-hole explosive quantity and the hole number, and reconstructing the vibration synthesis curve corresponding to the target group of the single-hole explosive quantity and the hole number by using the coupling relationship matrix, to obtain a blasting fitting curve; and
analyzing, based on an interference vibration reduction theory with an effect subtraction in a half main waveform period, a blasting vibration attenuation law of different combinations of inter-hole milliseconds and inter-row milliseconds, to determine a target millisecond, and determining a control strategy for millisecond blasting based on the target millisecond.