双孔微差及长柱药包爆破振动数值模拟研究

发布时间：2018-12-08 10:13

【摘要】：为进一步讨论双孔微差爆破及柱状药包爆破振动新特性,通过在空腔内壁施加等效爆源荷载方法,建立药包爆破振动LS-dyna数值模拟模型,分别对双孔微差爆破和长柱状药包爆破振动进行分析。通过控制加载时间模拟不同延时间隔下的微差爆破过程,同时建立不同长度的加载组元来表示柱状装药的药包长度,进而研究药包长度对爆破振动的影响。数值模拟结果与相应的理论计算结果具有较好的一致性。结果表明:微差爆破质点峰值速度与距离整体呈现负相关,但在衰减过程中出现局部的增大现象,增大的幅值和区间与延时间隔有关,间隔时间越长,局部放大效应距离爆源越远,放大幅值越小。对长柱药包的模拟结果则表明:对于介质中某一点,当药包长度达到特定值后,质点峰值速度将不随着药包长度的增长而增大,这表明传统的通过药量来衡量爆破振动幅值的计算方法具有一定局限性。这些成果对爆破振动预测及爆破施工设计具有一定指导意义。
[Abstract]:In order to further discuss the new vibration characteristics of double-hole millisecond blasting and cylindrical charge blasting, the LS-dyna numerical simulation model of blasting vibration was established by applying equivalent blasting source load to the inner wall of the cavity. The vibration of double hole millisecond blasting and long column charge blasting were analyzed respectively. The millisecond blasting process at different delay intervals is simulated by controlling the loading time, and the loading components of different lengths are established to express the charge length of the cylindrical charge, and the effect of the charge length on the blasting vibration is studied. The numerical simulation results are in good agreement with the corresponding theoretical results. The results show that the peak velocity of millisecond blasting is negatively correlated with the whole distance, but there is a local increase in the attenuation process. The amplitude and interval of the increase are related to the delay interval, and the longer the interval is, the longer the interval is. The further the local amplification effect is from the explosion source, the smaller the amplification amplitude is. The simulation results of the long column cartridge show that when the charge length reaches a certain value, the particle peak velocity does not increase with the increase of the charge length. This indicates that the traditional calculation method to measure the amplitude of blasting vibration by the amount of charge has certain limitations. These results have certain guiding significance for blasting vibration prediction and blasting construction design.
【作者单位】：华侨大学土木工程学院;
【基金】：国家自然科学基金(11672112) 高等学校博士学科点专项科研基金(20113718110002) 爆炸冲击防灾减灾国家重点实验室开放课题(DPMEIKF201307) 华侨大学科研基金项目(13BS402)
【分类号】：TB41

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