摘要
针对北京地铁某区段的浅埋复杂隧道掘进爆破振动进行现场试验研究,通过爆破振速的全程跟踪实测及数据分析,研究了掘进掌子面前后等距离处的地表振动特性。结果表明：已开挖的隧道形成的孔洞具有散射放大效应,致使掌子面后方地表处的最大波峰振速矢量总和是其前方等距离处的1.22~2.04倍;用ANSYS/LSDYNA软件进行数值模拟研究,模拟结果与实测的变化规律和特性吻合;在不改变炸药单耗及其他材料参数,仅改变隧道埋深及断面尺寸的状况下,通过数值计算分析得出,放大效应对埋深及断面尺寸的变化比较敏感,埋深越浅、断面尺寸越大,放大效应越显著。
Based on the experimental research of the blasting vibration effect on ground in complex shallow tunnel excavation in a section of Beijing subway,this paper studied the ground vibration characteristics at equal distances in the front and rear of tunneling blasting sources by whole course tracking and monitoring the blasting vibration velocity and analyzing the data.The results show that the opening formed by the excavated tunnel has a scattering and amplification effect and that the vector sum（PVS）of the peak ground vibration at the rear of working face is about1.22~2.04 times that at the front of equal distance.After the numerical simulation with ANSYS/LS-DYNA,it has been found that the simulated results are in great agreement with the field measured results in terms of changing law and characteristics.With the specific explosive charge and other material parameters fixed and only the buried depth and section size of tunnel changing,numerical calculations were made and the analyses show that the amplification effect,sensitive to tunnel depth and section size,is more notable when the tunnel depth is shallower and the section size is greater.
出处
《山东科技大学学报（自然科学版）》
CAS
2016年第1期79-85,共7页
Journal of Shandong University of Science and Technology(Natural Science)
关键词
城市地铁
浅埋隧道
地表振动
放大效应
数值模拟
隧道埋深
断面尺寸
city subway
shallow buried tunnel
surface vibration
amplification effect
numerical simulation
tunnel depth
section size
