摘要
针对新建引水隧洞爆破施工对临近隧道振动的影响,以深圳市石岩北引水隧洞工程为依托,运用MIDAS GTS NX有限元软件建立爆破振动模型,对邻近隧道峰值振速变化规律进行研究。结果表明:爆破峰值振速与单段最大炸药量呈线性正相关,与爆源和测点的距离呈反相关,并受到爆破区域岩性的影响。在最不利工况下,爆破施工引起的峰值振速为6.73 cm/s,大于振动预警值2 cm/s,小于规范安全要求7 cm/s。引水隧洞爆破开挖还会产生空洞效应,在掌子面前后3~4倍洞径范围内较为明显。根据数值模拟结果,在实际工程中应减小单段炸药量并采取毫秒微差错峰手段控制爆破,现场振动检测显示,临近隧道测点峰值振速为1.91 cm/s,小于规范预警值,达到安全标准,工程减振措施取得了良好的效果。
For the impact of blasting construction of new diversion tunnels on the vibration of adjacent tunnels,the blasting vibration model was established using MIDAS GTS NX finite element software based on Shenzhen Shiyan North Water Diversion Tunnel,to study the change law of peak vibration velocity of adjacent tunnels.The results indicate that the peak vibration velocity of blasting is positively correlated with the maximum amount of explosives in a single section,negatively correlated with the distance between the blast source and measuring point,and influenced by the rock type in the blasting area.Under the most unfavorable conditions,the peak vibration velocity caused by blasting construction is 6.73 cm/s,which is larger than the vibration warning value of 2 cm/s and smaller than the safety requirement of specification of 7 cm/s.Blasting excavation of diversion tunnel will also produce cavity effect,which is obvious within the range of 3~4 times diameter before and after the tunnel face.Based on numerical simulation results,the amount of explosives in a single section is reduced and millisecond micro-delay blasting is used to control the explosion in actual engineering.On-site vibration detection shows that the peak vibration velocity of the adjacent tunnel measuring point is 1.91 cm/s,which is lower than the specified warning value and meets safety standards.The vibration reduction measures taken in the project have achieved good results.
作者
杨景峰
冀玉豪
康兰方
梁斌
耿弈
YANG Jing-feng;JI Yu-hao;KANG Lan-fang;LIANG Bin;GENG Yi(CCCC-SHEC Forth Engineering Co.,Ltd.,Luoyang 471013,China;School of Civil Engineering,Henan University of Science&Technology,Luoyang 471000,China)
出处
《河南城建学院学报》
CAS
2023年第2期1-8,共8页
Journal of Henan University of Urban Construction
基金
国家自然科学基金项目(U1604135)
中交第二公路工程局有限公司重点科技研发项目(2020-5-20)
河南省科技厅产学研合作项目(2015HNCXY011)。
关键词
引水隧洞
爆破开挖
振动速度
减振措施
diversion tunnel
blasting excavation
vibration velocity
vibration reduction measures
