既有地铁车站地连墙爆破拆除施工振动分析
Vibration Analysis of Blasting Demolition Construction of Diaphragm Wall in Existing Subway Station
孙森 1张东明 1高志轩 2康飞 1周亚东2
作者信息
- 1. 中交一公局第八工程有限公司,天津 300170
- 2. 天津城建大学土木工程学院,天津 300384
- 折叠
摘要
盾构在掘进过程中遇到地连墙阻碍时,采用爆破拆除是一种高效的技术方法.因此,结合天津地铁7号线八里台站地连墙爆破拆除工程,采用数值模拟和现场监测的方法,对地铁车站以及周围建筑物的位移变化和振动传播规律进行了研究分析,即利用有限元软件MIDAS/GTS-NX建立三维模型并采用现场监测数据验证了模型的准确性.其结果为爆破振动速度在监测点处与模拟结果基本吻合,且均满足安全规范要求;爆破振动速度以炮孔为中心向四周迅速传播,达到峰值后逐渐衰减,10m之外的振动速度降至2cm/s左右.
Abstract
When the shield tunneling is hindered by the diaphragm wall,the blasting demolition construction is an efficient technical method.Based on the blasting project of Balitai Station of Tianjin Metro Line 7,the displacement change and vibration propagation law of the subway station and surrounding buildings are studied and analyzed by numerical simulation and field monitoring.MIDAS/GTS-NX finite element software is used to build a 3D model and the accuracy of the model is verified by on-site monitoring data.The result shows that blasting vibration velocity basically matches the simulation results at the monitoring points and both meet the safety specifications;The blasting vibration spreads rapidly outwards from the center of the blast holes.After reaching the peak,it gradually decays and the vibration velocity decreases to about 2 cm/s beyond 10 m.
关键词
地连墙/爆破拆除/数值模拟/振动分析Key words
diaphragm wall/blasting demolition/numerical simulation/vibration analysis引用本文复制引用
基金项目
天津市自然科学基金重点项目(18JCZDJC10010)
出版年
2024
国家科技期刊平台
NSTL
万方数据