为了降低爆破振动有害效应，探究爆破振动对地下管道的影响，需基于管道破坏的应变准则，建立爆破振动质点峰值速度与管道破坏的对应关系。首先利用TC-4850N爆破振动测试仪、DH3820静态应变测试系统在大龙经济开发区高铁城棚户区山地场平工程进行爆破现场试验；然后对获得不同爆心距、不同最大段装药量时管道地表振动峰值速度及相应管道轴向、环向应变，进行拟合分析，结果表明合成峰值振速与地下管道轴向、环向应变呈指数函数关系；最后结合该场地条件下爆破振动衰减规律及管道最大容许应变，预测出试验条件下管道所能承受的地表最大峰值振速及此爆破条件下管道爆破施工安全距离。分析表明，燃气管道50m范围内禁止爆破施工的规定有待改进，应根据实际情况分析预测地下管道安全距离。
Abstract
To explore the influence of blasting vibration on underground pipelines, the peak particle velocity used as criterion of blasting vibration and the strain used as criterion of underground pipeline affected by vibration. Using TC-4850N blasting vibration measurer and DH3820 static strain test system to monitor in the blasting construction of a project. They were measured surface vibration signal and the axial and circumferential strain of the pipe. Fitting analysis of peak particle velocity and pipeline strain showed that exponential relationship between blasting vibration peak particle velocity and axial and circumferential strain of corresponding underground pipelines. The fitting relationship combined with the attenuation law of blasting vibration to predict that the maximum ground peak velocity which the pipeline can support, which was 20.37cm/s, the safe distance was 25.25m. Thus it needs to be improved that prohibit blasting in the range of 50m and forecast the safe distance of underground pipeline according to the actual situation.
关键词
爆破振动 /
峰值振速 /
应变 /
拟合分析 /
安全判据
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Key words
Blasting vibration /
Peak particle velocity /
Strain /
Fitting analysis /
Safety criterion
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