| 爆破冲击波在台阶法隧道内的传播特性研究* |
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| 引用本文： | 廖杭,方晓峰,吴震,李梦可,余涛,方勇.爆破冲击波在台阶法隧道内的传播特性研究*[J].中国安全生产科学技术,2023,19(3):101-107. |
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| 作者姓名： | 廖杭 方晓峰 吴震 李梦可 余涛 方勇 |
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| 作者单位： | （1.西南交通大学 土木工程学院，四川 成都 610031；2.广东交通实业投资有限公司，广东 广州 510623;3.四川省铁路建设有限公司，四川 成都 610041） |
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| 基金项目： | * 基金项目: 国家自然科学基金项目（52078428）；四川省杰出青年基金项目（2020JDJQ0032） |
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| 摘 要： | 为了解决目前隧道施工过程中掌子面开挖爆破产生的冲击波容易造成工程灾害的问题，基于宁攀高速胜利隧道台阶法开挖的实际情况，采用动力分析软件ANSYS/LS-DYNA及现场测试的方法研究冲击波在隧道上下台阶区段的传播规律。研究结果表明:初始冲击波传播至下台阶断面时先扩散至中上区域，与拱顶及侧壁碰撞反射后再传播至下部区域；冲击波在下台阶段0~10 m范围内，经多次反射叠加形成提升幅度约30%的第2次超压峰值；冲击波由上台阶较小断面进入下台阶较大断面传播时，超压衰减速度相对加快，过渡界面前后10 m范围内衰减系数由1.01%最高提升至1.05%。现场实测数据与数值模拟结果在上下台阶段得到的波形传播规律基本一致，验证数值模拟的可靠性。研究结果可为实际工程中爆破冲击波在变截面隧道中的控制措施提供参考。
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| 关 键 词： | 公路隧道 冲击波 台阶法 传播规律 现场测试 |
Study on propagation characteristics of blasting shock wave in tunnelwith step method |
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| LIAO Hang,FANG Xiaofeng,WU Zhen,LI Mengke,YU Tao,FANG Yong.Study on propagation characteristics of blasting shock wave in tunnelwith step method[J].Journal of Safety Science and Technology,2023,19(3):101-107. |
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| Authors: | LIAO Hang FANG Xiaofeng WU Zhen LI Mengke YU Tao FANG Yong |
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| Affiliation: | (1.School of Civil Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China;2.Guangzhou Communications Investment Industry Co.,Ltd.,Guangzhou Guangdong 510623,China;3.Sichuan Railway Construction Co.,Ltd.,Chengdu Sichuan 610041,China) |
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| Abstract: | In order to solve the problem that the shock wave generated by the excavation blasting of the tunnel face is easy to cause engineering disasters during the current tunnel construction process,based on the actual situation of the step excavation of the Shengli Tunnel of Ningpan Expressway,the dynamic analysis software ANSYS/LS-DYNA and the field test method were adopted to study the propagation law of the shock wave in the upper and lower steps of the tunnel.The results showed that when the initial shock wave propagated to the lower step section,it first diffused to the upper-middle region,and then collided with the vault and sidewall,and finally propagated to the lower region,but the overpressure at the arch foot was higher than that at other positions of the wall due to its ‘horn’ structure.In the range of 0~10 m of lower step section,the shock wave formed a secondary overpressure peak with an increase of about 30% after multiple reflections.When the shock wave propagated from the smaller section of the upper step to the larger section of the lower step,the overpressure attenuation speed was relatively accelerated,and the attenuation coefficient in the range of 10 m before and after the transition interface increased from 1.01% to 1.05%.The waveform propagation law of field measured data and numerical simulation results on the upper and lower steps was basically consistent,which verified the reliability of numerical simulation.The research results can provide reference for the control measures of blasting shock wave in variable cross-section tunnel in practical engineering. |
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| Keywords: | Highway tunnels shock wave step method propagation law field testing |
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