地铁隧道下穿砖混结构建筑物爆破振动控制
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摘要
武汉地铁27号线纸地区间段为暗挖隧道,下穿3层砖混结构建筑物,埋深为16～26m。为了使地铁隧道安全地下穿砖混结构建筑物,通过减小最大单段药量、多分段和增加上下台阶的距离来优化爆破方案。将监测点沿着径向布置在地表,对爆破方案优化前与优化后测点所测的振动峰值速度和频率进行对比分析。结果表明:优化后的爆破振动峰值速度显著降低,频率明显增大,使建筑物更为安全;爆破方案优化后,当工作面位于建筑物外墙正下方时,振动峰值速度最大;从工作面后方到工作面前方,地表质点振动峰值速度先增大后减小,空洞效应和应力波的绕射现象明显,为类似工程的修建提供参考。
The metro section of Wuhan Subway Line 27 ranging from Zhifang to subway town is a subsurface tunnel which is underneath a three-story brick-concrete structure building with a buried depth of 16～26 meters. In order to make the subway tunnel safely underpass the brick-concrete structure, the blasting scheme was optimized by reducing the maximum single detonating charge, increasing the detonation sections, increasing the distance between the upper and lower steps. The monitoring points were arranged on the surface in the radial direction, and the comparison of the vibration peak velocity and frequency of the surface particles between pre-optimization and post-optimization of the blasting scheme was made. The results show that the blasting vibration velocity after optimization of the blasting scheme is significantly reduced, and the frequency is significantly increased, making the building more secure. After the blasting scheme is optimized, when the working surface is directly below the outer wall of the building, the blasting vibration velocity is the largest. From the back of the working face to the front of the working face, the blasting vibration velocity of the surface particles increase first and then decrease, and the hollow effect and the stress wave diffraction phenomenon are obvious. the study can provide reference for similar projects.
The metro section of Wuhan Subway Line 27 ranging from Zhifang to subway town is a subsurface tunnel which is underneath a three-story brick-concrete structure building with a buried depth of 16～26 meters. In order to make the subway tunnel safely underpass the brick-concrete structure, the blasting scheme was optimized by reducing the maximum single detonating charge, increasing the detonation sections, increasing the distance between the upper and lower steps. The monitoring points were arranged on the surface in the radial direction, and the comparison of the vibration peak velocity and frequency of the surface particles between pre-optimization and post-optimization of the blasting scheme was made. The results show that the blasting vibration velocity after optimization of the blasting scheme is significantly reduced, and the frequency is significantly increased, making the building more secure. After the blasting scheme is optimized, when the working surface is directly below the outer wall of the building, the blasting vibration velocity is the largest. From the back of the working face to the front of the working face, the blasting vibration velocity of the surface particles increase first and then decrease, and the hollow effect and the stress wave diffraction phenomenon are obvious. the study can provide reference for similar projects.
引文
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[16] 管晓明,傅洪贤,王梦恕,等.隧道爆破振动下砌体结构局部动力反应研究[J].现代隧道技术,2017,54(3):135-141.
[2] HB ZHAO,Y LONG,XH LI,et al.Experimental and numerical investigation of the effect of blast-induced vibration from adjacent tunnel on existing tunnel[J].Ksce Journal of Civil Engineering,2016,20 (1):431-439.
[3] U OZER.Environmental impacts of ground vibration induced by blasting at different rock units on the Kadikoy—Kartal metro tunnel[J].Engineering Geology,2008,100 (1):82-90.
[4] 宗琦,赵要才.砌体结构受爆破地震波作用破坏特征研究[J].安徽理工大学学报(自然科学版),2014,34(1):1-5.
[5] M YARI,R BAGHERPOUR,S JAMALI,et al.Development of a novel flyrock distance prediction model using BPNN for providing blasting operation safety[J].Neural Computing & Applications,2016,27 (3):1-8.
[6] 李地元,王涛.浅埋隧道爆破施工对地表建筑物安全的试验和数值分析[J].中国安全生产技术,2015,11(11):112-117.
[7] P YAN,Z ZHAO,W LU,et al.Mitigation of rock burst events by blasting techniques during deep-tunnel excavation[J].Engineering Geology,2015,188:126-136.
[8] 闫鸿浩,杨瑞,李晓杰,等.地铁隧道浅埋段下穿砖混结构房屋爆破振动控制研究[J].施工技术,2016(s1):422-427.
[9] 段宝福,朱应磊,吴圣智.复杂环境下浅埋隧道的爆破震动监测与控制技术[J].现代隧道技术,2013,50(3):142-146.
[10] R SHIRINABADI,E MOOSAVI.Twin tunnel behavior under static and dynamic loads of Shiraz metro,Iran[J].Journal of Mining Science,2016,52 (3):461-472.
[11] 陈贵,高文学,刘冬,等.浅埋隧道开挖爆破震动监测与控制技术[J].现代隧道技术,2014,51(5):193-198.
[12] 谢兴博,王希之,唐启超.城市复杂环境下浅埋地铁隧道掘进爆破[J].爆破,2014(3):91-95.
[13] 刘军,吴从师,高全臣.建筑结构对爆破震动的响应预测[J].爆炸与冲击,2000,20(4):333-337.
[14] 中华人民共和国国家标准编写组.爆破安全规程:GB6722-2014[S].北京:中国标准出版社,2015:42.
[15] 李夕兵,凌同华,张义平.爆破震动信号分析理论与技术[M].北京:科学出版社,2009:30-31.
[16] 管晓明,傅洪贤,王梦恕,等.隧道爆破振动下砌体结构局部动力反应研究[J].现代隧道技术,2017,54(3):135-141.