摘要
针对下穿既有环城公路隧道爆破产生的振动效应,同时考虑隧道上方公路车辆载荷耦合作用,运用LS-DYNA分别对设置减振孔和未设减振孔两种工况下的隧道爆破进行数值模拟,对比分析对公路的缓冲减振效应。模拟结合实测结果表明:减振孔可使应力大幅波动的时间延后且持续时间缩短,降低应力波和地震波的叠加效应;在减振孔周边,最大减振率约为41.7%,水平方向减振率明显高于垂直方向减振率;公路路面的最大减振率发生在中部,约为19.1%;设置减振孔使公路振速大幅波动的持续时间减少了50%。
Aiming at the vibration effect caused by the tunnel blasting under the existing ring road,and considering the coupling effect of the vehicle load above the tunnel,LS-DYNA was used to numerically simulate the tunnel blasting under two working conditions of with or without vibration damping holes.And then,compare and analyze the vibration reduction on the ring road.The results show that damping holes can delay the time and shorten the duration of stress wave and reduce the superposition effect of stress wave and seismic wave.The maximum vibration reduction rate around the vibration damping holes is about 41.7%,and the reduction rate in the horizontal direction is significantly higher than that in the vertical direction.The maximum reduction rate of the ring road occurs in the middle of the road surface,which is about 19.1%.The duration of large fluctuation of highway vibration speed can be reduced by 50%by setting damping holes.
作者
赵立财
ZHAO Licai(Department of Civil and Construction Engineering,National Taiwan University of Science and Technology,Taiwan Taipei,106;Third Engineering Co.Ltd.,China Railway 19th Bureau Group,Liaoning Shenyang,110136)
出处
《爆破器材》
CAS
CSCD
北大核心
2022年第3期50-56,共7页
Explosive Materials
基金
辽宁省“兴辽英才计划”青年拔尖人才资助项目(XLYC2007146)。
关键词
隧道爆破
车辆载荷
下穿公路
缓冲减振
数值模拟
tunnel blasting
vehicle load
under the highway
vibration reduction
numerical simulation