某大型露天砂石矿山爆破振动对燃气管道的影响研究

Study on Influence of Blasting Vibration on Gas Pipeline in a Large Open-pit Sand Mine

针对某大型露天砂石矿山拟扩界提产的工程背景,采用了TC4850型测振仪和L20-N型爆破振动记录仪,对现场爆破振动速度和振动频率进行实测。通过回归分析方法,研究得到了矿山燃气管道方向的爆破振动衰减规律。通过对比相关规范及类似工程案例,提出了爆破振动对燃气管道危害性的判别方法。分析表明,矿山按照设计要求进行爆破作业时,产生的爆破地震效应对矿界260 m处已有市政燃气管道的影响在允许范围之内,爆破振动速度和爆破振动加速度均小于安全允许值,研究成果为类似工程提供了参考。

In view of the engineering background of the proposed expansion and production increase of a large open-pit sand and gravel mine,the TC4850 vibrometer and L20-N blasting vibration recorder were used to measure the blasting vibration velocity and vibration frequency on site.Through the regression analy-sis method,the attenuation law of blasting vibration in the direction of mine gas pipeline is obtained.By com-paring the relevant specifications and similar engineering cases,a method for judging the harmfulness of blasting vibration to gas pipelines is proposed.The analysis shows that when the mine carries out the blasting operation according to the design requirements,the influence of the blasting seismic effect on the existing municipal gas pipeline at 260 m of the mine boundary is within the allowable range,and the blasting vibra-tion velocity and blasting vibration acceleration are less than the safety allowable value.The research results provide a reference for similar projects.