摘要
以新疆乌鲁木齐市地铁1号线东线隧道中营工-小西沟区间段为工程背景,对地铁浅埋隧道爆破振动进行了多次监测试验,发现地铁浅埋隧道地表掌子面前后16m监测范围内存在空洞效应现象,随着与掌子面距离由小变大,空洞效应现象出现先增强后减弱的趋势直至最后消失;运用LS-DYNA程序,采用拉格朗日算法和完全重启动相结合的方法对地铁浅埋隧道爆破振动进行数值模拟,也得出了地铁浅埋隧道地表掌子面前后存在空洞效应现象的结论,空洞效应现象存在的区域为掌子面两侧10m范围内,空洞效应现象在掌子面两侧6m处最为显著.通过将掏槽孔装药一次爆破调整为多分段爆破,减小了掏槽孔单段起爆药量,降低了掏槽孔爆破产生的地表振动效应.
This paper took the Zhongyinggong-Xiaoxigou segment of Xinjiang Urumqi Line1subway tunnel as the engineering background.By conducting several vibration monitoring tests on the subway tunnel surface it was found that hollow effect phenomenon existed in the monitoring range of16m before and behind the tunnel face of the shallow subway tunnel.As the measure points got further from the tunnel face,hollow effect phenomenon showed the tendency of going up first,declining later,and disappeared finally.In this paper,lagrange algorithm and complete restart were adopted to simulate the blasting of subway shallow tunnel using LS-DYNA program.It showed that hollow effect phenomenon existed in the range of10m before and behind the tunnel face of the shallow subway tunnel;this phenomenon was most significant at the point of6m before and behind the tunnel face.By changing the blasting of the cut hole charge into multi section blasting,the single-stage detonation dose and the surface vibration effect were reduced.It not only ensured the safety of subway construction but also effectively controlled the impact of tunnel blasting construction on surrounding buildings.
作者
石连松
高文学
王林台
SHI Lian-song;GAO Wen-xue;WANG Lin-tai(College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China;North China Institute of Aerospace Engineering,Langfang,Hebei 065000,China)
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2018年第12期1237-1243,共7页
Transactions of Beijing Institute of Technology
基金
国家自然科学基金资助项目(51678018)
关键词
地铁浅埋隧道
振动监测
空洞效应
数值模拟
subway shallow buried tunnel
vibration monitoring
hollow effect
numerical simulation
