基坑爆破开挖爆点位置与基坑高度对爆破振动影响研究
Influence of Blasting Point Position and Foundation Pit Height on Blasting Vibration during Foundation Pit Blasting Excavation
刘宽 1徐志豪 2汤渊 3沈俊 2包小华 2沈平欢 1欧阳3
作者信息
- 1. 上海隧道工程有限公司,上海市 200232
- 2. 深圳大学 土木与交通工程学院,广东 深圳 518060
- 3. 广东长正建设有限公司,广东 珠海 519000
- 折叠
摘要
针对基坑爆破振动预测不准确的问题,该文采用有限元模拟软件,深入研究基坑爆破开挖时爆点位置和基坑高度对振动的影响.首先,基于妈湾跨海隧道基坑爆破开挖工程进行数值模拟,验证模型的适用性;随后在保持爆心距不变的情况下,通过调整基坑爆破点到基坑边缘的距离和基坑的高度,研究这两个因素对地表振动的影响.研究结果表明:随着爆破点到基坑边缘的距离增加,相应距离测点的振动速度逐渐减小;基坑高度越高,相应距离测点的振动速度越大;基坑高度对地表振速的影响要大于爆点位置的影响.研究成果能为基坑爆破的振动预测提供一定参考,具有工程实际意义.
Abstract
In view of inaccurate vibration prediction of foundation pit blasting,the influence of blasting point position and foundation pit height on vibration during foundation pit blasting excavation was studied by using finite element simulation software.First,based on the foundation pit blasting excavation of the Mawan Cross-Sea Passage,a numerical simulation was carried out to verify the applicability of the model.Then,under unchanged blasting center distance,the distance from the blasting point to the edge of the foundation pit and the foundation pit height were changed respectively,and the influence of these two factors on surface vibration was studied.The results show that a greater distance from the blasting point to the edge of the foundation pit indicates a smaller vibration velocity of the corresponding distance measuring point.As the height of the foundation pit increases,the vibration velocity of the corresponding distance measuring point gets larger.The influence of foundation pit height on surface vibration velocity is greater than that of blasting point position.The research results can provide some reference for the vibration prediction of foundation pit blasting and have practical engineering significance.
关键词
基坑/爆破/振动/数值模拟/爆点位置/基坑高度Key words
foundation pit/blasting/vibration/numerical simulation/blasting point position/foundation pit height引用本文复制引用
基金项目
国家自然科学基金资助项目(52022060)
国家自然科学基金资助项目(52090084)
深圳市科技创新计划项目(JCYJ20190808112203700)
出版年
2024
国家科技期刊平台
NSTL
万方数据