基于单孔爆破的节理裂隙减振模型试验研究

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (7) : 255-261.

论文

基于单孔爆破的节理裂隙减振模型试验研究

潘长春，徐颖，宗琦

作者信息 +

Tests for vibration reduction model of joint fracture based on single-hole blasting

PAN Changchun,XU Ying,ZONG Qi

Author information +

文章历史 +

摘要

在复杂环境的城市地下工程进行爆破开挖，对青岛地铁控制爆破振动危害提出了极高标准。文中主要基于考虑富含天然裂隙岩石地质条件下，通过模型试验研究了岩体裂隙对爆破振动波传播规律的影响。试验结果表明，岩体裂隙的存在阻碍了爆破振动波的传播，明显降低了爆破振动效应，当提高装药量时，爆破振动效应就越强且趋势变快，爆破振动频率也越靠近建筑物固有频率。当裂隙深度发育越深时，爆破振动效应就越弱，可裂隙深度过大，降低爆破振动效应程度并不明显；同时裂隙深度的发育，对各向爆破振动频率影响趋势基本一致，表现出波动性极小。波形频谱表明单孔爆破试验中爆破振动信号波形简单，振动峰值和频率单一。

Abstract

Higher standards were proposed for Qingdao subway controlled blasting vibration possible hazards,in order to do blasting excavation for urban underground engineering under complex environ ment.The propagating laws of blasting vibration waves under rich fractured rock geological conditions were studied using the model tests.The test results indicated that the presence of rock fractures hinders the propagating of blasting vibration waves,the blasting vibration effect is reduced significantly; when explosive charge increases,the blast vibration effect is stronger,its trends becomes faster and the blasting vibration frequency is closer to the building natural frequency; the deeper the growth of fractukes’ depth,the weaker the blasting vibration effect; if the depth of fractures is too big,the reduction of the blasting vibration effect is not obvious; the growth of the fracture’s depth has a basically same effect with a very small fluctuation on the blasting vibration frequencies in all directions.The waveform spectrum analysis showed that the single-hole blasting signals have a simple waveform and their vibration peak and frequency are single.

导出引用

潘长春，徐颖，宗琦. 基于单孔爆破的节理裂隙减振模型试验研究[J]. 振动与冲击, 2017, 36(7): 255-261

PAN Changchun,XU Ying,ZONG Qi. Tests for vibration reduction model of joint fracture based on single-hole blasting[J]. Journal of Vibration and Shock, 2017, 36(7): 255-261

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