地铁隧道电子雷管爆破降振技术及爆破参数优化

发布时间：2018-06-04 13:39

本文选题：地铁隧道 + 爆破振动控制　；参考：《科学技术与工程》2017年27期

【摘要】：以北京地铁隧道16号线施工为工程背景,采用电子雷管爆破技术,研究了不同炮孔布置方式及隧道上方土体较厚时爆破振动波的传播规律。研究结果表明:采用三排掏槽孔爆破可以有效地降低爆破振动,并提高单次进尺。隧道埋深较大时,爆破主频较低,信号内小于20 Hz的低频能量比例较大。采用电子雷管微差爆破很难提高爆破远区的振动主频,因此必须减小爆破药量和单次进尺以控制振动强度。距隧道掌子面25~30 m范围内有建筑物时,必须采用小爆破进尺,单孔装药量最大不超过1.2 kg。当建筑物在30 m以外时,可以适当增加爆破进尺。研究成果可为类似工程提供有益的参考。
[Abstract]:Taking the construction of Beijing Metro Tunnel Line 16 as the engineering background, the propagation of blasting vibration wave in different hole layout and thick soil above the tunnel was studied by means of electronic detonator blasting technology. The results show that the vibration of the blasting can be reduced effectively by using the three-row cut hole blasting, and the single advance rule can be improved. When the buried depth of the tunnel is larger, the main frequency of blasting is lower and the ratio of low frequency energy less than 20 Hz in the signal is larger. It is difficult to increase the main frequency of vibration in the far area of blasting by using electronic detonator millisecond blasting, so it is necessary to reduce the blasting charge and single ruler to control the vibration intensity. When there is a building within 25m from the tunnel face, a small blasting rule must be adopted, and the maximum charge quantity of a single hole is not more than 1.2 kg. When the building is beyond 30 m, the blasting advance can be increased appropriately. The research results can provide useful reference for similar projects.
【作者单位】：延安市禾草沟煤业有限公司;中冶建筑研究总院有限公司;中国矿业大学(北京);
【分类号】：U231.3;U455.6

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