Study on blasting vibration of the bottomplate of Jiaohuayu tunnel
WU Yu
LIU Dianshu
XIE Feng
ZHANG Zhenyuan
YUAN Da
Abstract：In order to analyse blasting vibration of bottomplate of tunnel floor,sensors were installed in different position to monitor vibration velocity of step blasting excavation engineering of Jiao huayu tunnel.The velocity was analyzed by the method of nonlinear regression.The results show that cutting hole blasting vibration is greater than that of the auxiliary hole and peripheral hole.The fitting parameters K and α of cutting hole in vertical direction,horizontal radial and shear velocity is larger than other holes.The vertical velocity is the biggest among the three directions.The α value of three components of the velocity is similar in the same type of holes.The influence of the frequency on the dosage and distance is analyzed.It is conclude that with the increase of the charge weight,the high frequency components of the blasting vibration are relatively rich.The peaks of the spectral curve are less and mainly concentrated at the low frequency.The frequency of attenuates is faster.When the distance increases,the peaks of spectral curve decreases and the frequency bandwidth become narrow.The curve mainly concentrates in the low frequency region.The relative amplitude peaks on each spectral curve move closer to the low frequency.
Keywords：tunnel blastingvibration lawfitting parametersfrequency attenuation
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 138-144 )