凹形地貌水下爆破减振技术研究  

Research on vibration damping technology of underwater blasting in concave landform

作　　者：王明俊 王雨峰 杨飞 李泉 WANG Ming-jun;WANG Yu-feng;YANG Fei;LI Quan(Guangzhou Downtown District Transportation Project Management Center,Guangzhou 510030,China;Scho ol of Civil and Transportation Engineering,Guangdong University of Technology,Guangzhou 510006,China;Guangzhou Blasting Engineering Co.,Ltd.,Guangzhou 510030,China)

机构地区：[1]广州市中心区交通项目管理中心,广州510030 [2]广东工业大学土木与交通工程学院,广州510006 [3]广州爆破工程有限责任公司,广州510030

出　　处：《工程爆破》2024年第4期131-141,共11页Engineering Blasting

基　　金：国家自然科学基金资助项目(12072079)。

摘　　要：为深入探究凹形地貌水下爆破时减振孔的不同参数对地表震动所产生的影响,结合广州的某一沉管隧道基槽开挖工程,借助LS-DYNA对水下钻孔爆破展开模拟计算。着重研究了在凹形地貌水下钻孔爆破进程中,减振孔的位置、排数、深度以及距离对于河岸地表的质点峰值振速PPV(Peak Particle Velocity)和减振率的影响状况。研究结果表明,河岸地表振动是水击波和地震波协同作用的结果,水击波对河岸震动起主导作用;减振孔布置在爆源附近基本没有减振效果,布置在监测点周围时减振率为26.6%,被动隔离比主动隔离更适合凹形地貌水下爆破;地表测点的PPV随着减振孔排数的增大呈减小趋势;增加减振孔的深度能够显著提高减振率,但提升效果有限,建议工程上采用浅孔多排布置方式;减振率随着减振孔离河岸的距离的增加先增大后减少,减振孔距离河岸2.5 m时,减振效果最好。In order to deeply investigate the influence of different parameters of damping holes on the surface vibration in the case of underwater blasting in concave terrain,this paper is related to an immersed tube tunnel trench excavation project in Guangzhou,and simulation calculations are carried out with the help of LS-DYNA for underwater drilling and blasting.The influence of the location,number of rows,depth and distance of the damping holes on the Peak Particle Velocity(PPV)and damping rate of the plasmas on the surface of the river bank during underwater drilling and blasting in concave terrain is emphasized.The results show that the surface vibration of the riverbank is the result of the synergistic effect of water shock waves and seismic waves,water shock waves on the riverbank vibration plays a dominant role;vibration damping holes arranged in the vicinity of the source of the explosion basically has no vibration damping effect,the vibration damping rate of 26.6%when arranged around the monitoring point,passive isolation is more suitable for concave geomorphology than the active isolation of the underwater blasting;the PPV of the surface measurement points with the increase in the number of rows of vibration damping holes is a trend of reduction;increase the depth of damping The depth of the hole can significantly improve the vibration damping rate,but the enhancement effect is limited,and it is recommended that the project use shallow holes in multiple rows;vibration damping rate increases and then decreases with the increase in the distance of the damping hole from the river bank,and the damping effect is best when the damping hole is 2.5 m from the river bank.

关 键 词：沉管隧道 减振 数值模拟 水下钻孔爆破 

分 类 号：TD235.1[矿业工程—矿井建设]