[1]石伟民,何方,陈士海,等.新建隧道下穿既有铁路结构爆破振动影响分区及减震优化[J].华侨大学学报(自然科学版),2021,42(6):764-771.[doi:10.11830/ISSN.1000-5013.202011032]
　SHI Weimin,HE Fang,CHEN Shihai,et al.Blasting Vibration Influence Zone and Damping Optimization of New Tunnel Under Existing Railway Structure[J].Journal of Huaqiao University(Natural Science),2021,42(6):764-771.[doi:10.11830/ISSN.1000-5013.202011032]
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新建隧道下穿既有铁路结构爆破振动影响分区及减震优化()
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《华侨大学学报（自然科学版）》[ISSN:1000-5013/CN:35-1079/N]

卷:
第42卷
期数:
2021年第6期
页码:
764-771
栏目:
出版日期:
2021-11-12

文章信息/Info

Title:
Blasting Vibration Influence Zone and Damping Optimization of New Tunnel Under Existing Railway Structure
文章编号:
1000-5013(2021)06-0764-08
作者:
石伟民1;  何方2;  陈士海1;  揭海荣2;  李海波3
1. 华侨大学 土木工程学院, 福建 厦门 361021;2. 中铁二十四局集团福建铁路建设有限公司, 福建 福州 350013;3. 中国科学院 武汉岩土力学研究所, 湖北 武汉 430071
Author(s):
SHI Weimin1;  HE Fang2;  CHEN Shihai1;  JIE Hairong2;  LI Haibo3
1. College of Civil Engineering, Huaqiao University, Xiamen 361021, China; 2. China Railway 24th Bureau Group Fujian Railway Construction Limited Company, Fuzhou 350013, China; 3. Wuhan Institute of Geotechnical Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
关键词:
爆破振动;  振动分区;  数值模拟;  参数优化
Keywords:
blasting vibration;  vibration zone;  numerical simulation;  parameter optimization
分类号:
TD235
DOI:
10.11830/ISSN.1000-5013.202011032
文献标志码:
A
摘要:
以厦门轨道3号线区间隧道下穿既有铁路为工程背景,通过现场爆破振动监测数据,引入比例距离(R^-)拟合振动衰减曲线,探究新建隧道下穿既有铁路结构的振动响应规律.通过数值模拟计算隔振空孔爆破、单孔单响与分段延时起爆对铁路结构的减震作用.试验结果表明:当0<R^-<13.73时为爆破振动影响近区,当13.73≤R^-≤28.45时为爆破振动影响中区,当R^->28.45时为爆破振动影响远区,且振动影响近区振速衰减最快,中区衰减过渡,远区趋于衰减平缓;增设隔振空孔不仅可以减震,还能扩大分区影响范围,提升作业效率;相比单孔单响起爆,分段延时间隔起爆能显著降低波形叠加效应,达到减震作用.
Abstract:
Taking the tunnel of Xiamen Railway Line 3 under the existing railway as the engineering background, through the field blasting vibration monitoring data, the proportional distance(R^-)is introduced to fit the vibration attenuation curve, the vibration response is investigated when a new tunnel is built under the existing railway. Numerical simulation is used to calculate the vibration damping effect of vibration isolation hole blasting, single hole with single detonation and piecewise delayed detonation on railway structure. The test results show that, when 0<R^-<13.73, it is the near zone affected by blasting vibration, when 13.73≤R^-≤28.45, it is the middle zone affected by blasting vibration, and when R^->28.45, it is the far zone affected by blasting vibration. The vibration speed reduces fastest in the near zone affected by blasting vibration, slows in the middle zone, and flats in the far zone; the addition of vibration isolation holes not only reduces the vibration, but also expands the area of influence and improves the work efficiency. Compared with a single hole with single detonation, the detonation of the segmented delay interval can significantly reduce the waveform superimposition effect and achieve the effect of shock absorption.

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备注/Memo

备注/Memo:
收稿日期: 2020-11-14
通信作者: 陈士海(1964-),男, 教授,博士,博士生导师,主要从事岩土工程的研究.E-mail:cshblast@163.com.
基金项目: 国家自然科学基金资助项目(51974136); 福建省厦门市高校产学研项目(3502Z20203045)http://www.hdxb.hqu.edu.cn
更新日期/Last Update: 2021-11-20