Field test study on vibration reduction effect of blasting barrier hole during excavation of foundation pit
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1.Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization; Institute of Deep Earth Sciences and Green Energy; College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, Guangdong, P. R. China;2.China Railway 25th Bureau Group Co., Ltd. Shield Engineering Branch, Guangzhou 510600, P. R. China;3.Shenzhen Municipal Design and Research Institute, Shenzhen 518029, Guangdong, P. R. China;4.Changchun Guoxi Real Estate Co. Ltd, Changchun 130022, P. R. China

Clc Number:

TU751.9

Fund Project:

“Pearl River Talent Plan” Innovation and Entrepreneurship Team Project of Guangdong Province (No. 2019ZT08G315); National Natural Science Foundation of China (No. 52004163); Shenzhen Basic Research Foundation (Nos. JCYJ20210324093402006, JCYJ20220818095605012)

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    Abstract:

    In order to reduce the dynamic disturbance of adjacent structures caused by blasting construction of foundation pit by using blasting, field test to study the vibration reduction law of the blasting barrier holes was conducted relying on the blasting construction project of foundation pit of No. 1 comprehensive well of Shenzhen Metro Line 16. Based on monitoring of the ground vibration under different blasting barrier hole parameters, influence of blasting barrier hole on peak velocity and dominant frequency of particle vibration on the ground and the influence of parameters of blasting barrier hole on its vibration barrier effect were analyzed. It is found that when the diameter of the blasting barrier hole increases, the vibration isolation rate of vibration barrier hole (VIR) in horizontal radial and horizontal tangential directions increase first and then decrease, the VIR in vertical direction increases and the VIR based on resultant velocity increases. Furthermore the VIR decreases first and then tends to be stable with increase of the row spacing of the damping vibration barrier holes. In addition, when the proportion of water filling in the blasting barrier hole increases, the VIR in horizontal radial direction decreases, the VIR in horizontal tangential and vertical directions increase first and then decrease, and the VIR based on resultant velocity increases first and then decreases.

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吕岸霖,张凯,吴振宇,王建新,范佰通,彭琦,柴德华,王邦浩,朱建波.基坑爆破施工减振孔减振效应现场试验研究[J].土木与环境工程学报(中英文),2025,47(2):116~125

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History
  • Received:September 19,2022
  • Revised:
  • Adopted:
  • Online: March 10,2025
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