空气间隔装药周边眼爆破精细化数值模拟  

The refined numerical simulation for the periphery hole blasting with air-deck charge

作　　者：关振长[1] 周宇轩 吕春波 吕荔炫 GUAN Zhenchang;ZHOU Yuxuan;Lü Chunbo;Lü Lixuan(College of Civil Engineering,Fuzhou University,Fuzhou 350116,Fujian,China;Fuzhou Planning&Design Research Institute Group Co.,Ltd.,Fuzhou 350108,Fujian,China)

机构地区：[1]福州大学土木工程学院,福建福州350116 [2]福州市规划设计研究院集团有限公司,福建福州350108

出　　处：《隧道与地下工程灾害防治》2022年第4期11-19,共9页Hazard Control in Tunnelling and Underground Engineering

基　　金：国家自然科学基金资助项目(51678155);福建省自然科学基金资助项目(2021J01599)。

摘　　要：为探讨空气间隔装药周边眼爆破的等效爆破荷载,在LS-DYNA平台上建立空气间隔装药的双孔周边眼模型,对其爆破瞬态过程展开流固耦合的精细化模拟。装药段炮眼周边岩体受爆炸应力冲击作用而粉碎,随后两股爆炸应力叠加产生的合成拉应力促使主裂缝沿炮眼连心线萌生并最终贯通;炮眼连心线上各测点的压力-时程曲线大致呈三角形,且各测点压力峰值随爆源距离迅速衰减。空气段炮眼周边不存在粉碎区,合成拉应力仍可促使主裂缝萌生并贯通;炮眼连心线上各测点的压力时程曲线呈现多峰形态,其压力峰值相较于装药段大幅降低,持时明显增长。将真实爆破荷载峰值沿炮眼连心线方向平均化为等效爆破荷载峰值,形成阶梯型等效爆破荷载。该等效爆破荷载既体现了真实爆破荷载的主要特征,又做出了充分简化,可为后续远场振动效应的数值模拟分析提供基础支撑。To clarify the equivalent blasting load for the periphery hole with air-deck charge,the refined numerical model for two contour holes with air-deck charge was established on the LS-DYNA platform,and the instantaneous blasting process was carefully simulated through fluid-solid coupling algorithm.As for the charge section,the surrounding rock were crushed immediately due to the intensive blasting pressure,while the tensile stress due to the superstition of two blasting pressures produced the main crack along centerline.The pressure time-histories along centerline were triangle-shaped,and the peak value attenuated sharply with blasting distance.As for the air section,no crush zone appeared surrounding the hole,while the superimposed tensile stress could still produce the main crack along centerline.Comparing to the charge section,the pressure time-histories along centerline were characterized by multi-peaks,while the peak value decreased substantially and the duration increased notably.The peaks of real blasting load were averaged along centerline,which yielded the equivalent blasting load with ladder-type.The equivalent blasting load reflected the main features of real blasting load in a simplified way,which could provide some technical supports for the further numerical simulation about far-field vibration.

关 键 词：空气间隔装药 周边眼 精细化数值模拟 压力-时程曲线 等效爆破荷载 

分 类 号：TD235[矿业工程—矿井建设] U45[建筑科学—桥梁与隧道工程]