摘要
针对高压输电铁塔爆破振动安全控制标准不明确,难以指导施工的难题,以某在建高速公路隧道工程为依托,设计单循环200 kg工业炸药量级隧道爆破掘进孔网参数,开展临近高压铁塔塔基质点爆破振动现场监测,对振动信号进行统计分析,研究了隧道爆破施工对临近高压铁塔的振动响应特征及振动信号的衰减规律。结果表明:随着爆心距的减小,塔基质点振动峰值合速度呈增大趋势,振动能量集中频带向低频方向发展,振动频率受隧道围岩裂隙发育程度的影响较明显;竖直方向的振速峰值均大于水平方向的振速峰值,要重点关注塔基竖向振动危害,防止塔基面介质的沉降;采用多段别延期起爆网路,严格控制低段别雷管的最大起爆药量,可有效削弱爆破振动对高压铁塔的危害效应。通过数据拟合,得出了本工程条件下隧道爆破质点振动传播衰减公式。本隧道工程将高压铁塔处的爆破振动速度控制在1.0 cm/s以内,确保铁塔安全运营,因此建议电力主管部门和制法机关适当放宽电力设施周边爆破作业的管控范围。
The safety control standard of blasting vibration of high-voltage transmission tower is still not clear,which makes it difficult to guide the construction.Based on a highway tunnel under construction,this paper designs the blast hole network parameters for a tunnel with 200 kg explosive per round.The blast vibration signals are monitored near the tower foundation and statistically analyzed to study the bibration response characteristics of the high voltage tower and the attenuation law of the vibration signals.The results show that with the decrease of the distance to the blast source,the vector peak particle velocity of the tower foundation increases.The frequency band of vibration energy concentration tends to low frequency and the vibration frequency is obviously affected by the development degree of cracks in surrounding rock.The peak values of vibration velocity in the vertical direction are greater than those in the horizontal direction,so the vertical vibration damage of the foundation should be paid more attention to prevent any settlement of the medium.By adopting multi-delay initiation network and strictly controlling the maximum charge for lower delays,the damage effect of blasting vibration on the high voltage tower can be effectively weakened.Through data fitting,the attenuation formula of blast vibration in for this project is obtained.In this tunnel project,the blasting vibration velocity at the tower is controlled within 1.0 cm/s to ensure the safe operation of the high voltage transmission tower.Therefore,it is suggested that the competent authority of electric power and the law-making authority appropriately relax the control scope of blasting operations around the power facilities.
作者
伍岳
贾永胜
黄小武
刘昌邦
周祥磊
徐华建
刘芳
WU Yue;JIA Yong-sheng;HUANG Xiao-wu;LIU Chang-bang;ZHOU Xiang-lei;XU Hua-jian;LIU Fang(State Key Laboratory of Precision Blasting,Jianghan University,Wuhan 430056,China;Wuhan Explosions&Blasting Co.,Ltd.,Wuhan 430056,China;SINOSTEEL Wuhan Safety&Environmental Protect Research Institute Co Ltd.,Wuhan 430081,China)
出处
《爆破》
CSCD
北大核心
2022年第3期165-171,198,共8页
Blasting
基金
湖北省自科基金重点项目(创新群体2020CFA043)
湖北省重点研发计划项目(2020BCA084)。
关键词
隧道开挖
高压铁塔
爆破振动
振动监测
tunnel excavation
high-voltage tower
blasting vibration
vibration monitoring
