Dynamic response and safety control of civil air defense tunnel group during the whole process of underpass tunnel blasting excavation

IF 2.1 Q2 ENGINEERING, CIVIL International Journal of Protective Structures Pub Date : 2022-08-12 DOI:10.1177/20414196221119234
Fengjiao Yang, N. Jiang, Chuan-bo Zhou, Guopeng Lyu, Yingkang Yao
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引用次数: 2

Abstract

To ensure the safety and stability of adjacent underground structures is a key problem for the subway tunnel blasting construction. In this paper, there is a tunnel group (Sheshan civil air defense engineering) composed of several tunnel units right above a subway tunnel under blasting construction (Wuhan Metro Line 5). The vibration of the tunnel group induced by two blasting excavations of the subway tunnel was monitored. For further research, an effective 3D numerical model established by LS-DYNA, which was verified by field monitoring data, was used to analyze the dynamic response of the tunnel group in the whole process of the subway tunnel blasting. According to the numerical simulation results, the dynamic response characteristics of each tunnel unit were studied, and the most vulnerable area in each tunnel unit was determined. Then, the functional relationships between the maximum vibration velocities and the maximum tensile stresses of the vulnerable areas were established. Based on the maximum tensile stress criterion, the safety vibration velocity threshold of each vulnerable area was calculated using the relationship models. Furthermore, for convenient field monitoring during the subway construction, the safety vibration threshold at the floor of the tunnel group was also calculated. Lastly, to obtain the maximum charge per delay, five cut blasting with different charges were simulated. The maximum charge of the cut blasting in different stages of the subway tunnel blasting excavation was proposed. The research results of this paper have reference value for the blasting vibration safety control of similar tunnel excavation projects in the future.
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人防隧道群在地下通道隧道爆破开挖全过程中的动力响应及安全控制
确保相邻地下结构的安全稳定是地铁隧道爆破施工的关键问题。在武汉地铁5号线一条正在爆破施工的地铁隧道正上方,有一个由多个隧道单元组成的隧道群(佘山人防工程)。对地铁隧道两次爆破开挖引起的隧道群振动进行了监测。为了进一步研究,使用LS-DYNA建立的有效的三维数值模型,并通过现场监测数据验证,分析了隧道群在地铁隧道爆破全过程中的动力响应。根据数值模拟结果,对各隧道单元的动力响应特性进行了研究,确定了各隧道单元中最脆弱的区域。然后,建立了易损区最大振动速度与最大拉应力之间的函数关系。基于最大拉应力准则,利用关系模型计算了各易损区的安全振动速度阈值。此外,为了方便地铁施工过程中的现场监测,还计算了隧道群底板的安全振动阈值。最后,为了获得每次延迟的最大装药量,模拟了五次不同装药的切割爆破。提出了地铁隧道爆破开挖不同阶段路堑爆破的最大装药量。本文的研究成果对今后类似隧道开挖工程的爆破振动安全控制具有参考价值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
4.30
自引率
25.00%
发文量
48
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