邻近隧道爆破施工对既有高铁隧道的振动安全分析

发布时间：2018-06-04 14:40

本文选题：高速铁路 + 隧道　；参考：《华东交通大学》2017年硕士论文

【摘要】：新建隧道邻近既有高铁隧道进行爆破施工时,炸药爆炸产生的爆破振动波可能会引起既有高铁隧道衬砌结构和周围围岩的破坏,对既有高铁隧道的安全运营造成影响。因此,为了保证既有高速铁路隧道的安全运营,有必要对此类工程进行研究。本文结合福铁路闽赣段金山顶隧道救援隧道爆破施工工程实例,主要做了以下工作:首先对近接平行隧道爆破施工的振动理论、爆破振动监测及控制技术进行了研究总结,并结合现场调研,制定了合理的爆破振动监测方案;然后依据动力弹性理论,结合现场爆破振动监测得到的振动速度与动应变数据,通过线性拟合得到动应变与振动速度的关系公式,基于隧道混凝土衬砌动拉应力容许标准,确定了适用于金山顶高铁隧道的爆破安全允许振动速度控制标准,采用萨道夫斯基经验衰减公式对爆破振动速度监测数据进行回归分析,得到了适用于金山顶高铁隧道的爆破振动衰减经验公式,对爆破振动波形图进行了时域分析和频谱分析,确定了爆破振动波的主频域和主频分布;其次根据爆破振动监测数据综合分析结果,发现按照现有救援隧道爆破方案施工会对既有隧道结构造成危害,因此提出了控制爆破振动的措施对现有爆破方案进行了优化;最后运用数值模拟手段,采用有限元软件midas GTS NX研究新建隧道爆破施工对既有高铁隧道的动力响应,分析了既有隧道衬砌结构的振动速度、加速度、应力分布规律,并通过振动速度和应力的大小对优化后的爆破方案进行安全评估,判断新建救援隧道爆破施工时既有高铁隧道衬砌结构的安全性,以保证救援隧道的成功修建和金山顶高铁隧道的安全运营。研究成果可为类似隧道爆破施工工程提供参考。
[Abstract]:The blasting vibration wave caused by explosive explosion may cause damage to lining structure and surrounding rock of existing high-speed railway tunnel when blasting construction is carried out in the vicinity of existing high-speed railway tunnel, which will affect the safe operation of existing high-speed railway tunnel. Therefore, in order to ensure the safe operation of the existing high-speed railway tunnel, it is necessary to study this kind of project. In this paper, combined with the blasting engineering example of Jinshan Tunnel in Fuzhou Railway, the main works are as follows: firstly, the vibration theory, blasting vibration monitoring and control technology of adjacent parallel tunnel blasting are studied and summarized. Based on the field investigation and investigation, a reasonable blasting vibration monitoring scheme is established, and then according to the dynamic elasticity theory, the vibration velocity and dynamic strain data obtained from the on-site blasting vibration monitoring are combined. The relationship between dynamic strain and vibration velocity is obtained by linear fitting. Based on the allowable criterion of dynamic tensile stress of concrete lining of tunnel, the blasting safety allowable vibration speed control standard for Jinshan high-speed railway tunnel is determined. The empirical attenuation formula of blasting vibration is obtained by means of regression analysis of blasting vibration velocity monitoring data by means of Sadolski's empirical attenuation formula, and the time-domain and spectral analysis of the wave chart of blasting vibration is carried out. The main frequency domain and main frequency distribution of blasting vibration wave are determined. Secondly, according to the comprehensive analysis results of blasting vibration monitoring data, it is found that the construction of the existing rescue tunnel blasting scheme will cause harm to the existing tunnel structure. Therefore, the measures of controlling blasting vibration are put forward to optimize the existing blasting schemes. Finally, the dynamic response of new tunnel blasting to existing high-speed railway tunnel is studied by means of numerical simulation and finite element software midas GTS NX. The vibration velocity, acceleration and stress distribution of the existing tunnel lining structure are analyzed, and the safety evaluation of the optimized blasting scheme is carried out through the vibration velocity and the magnitude of the stress. In order to ensure the successful construction of rescue tunnel and the safe operation of Jinshan high-speed railway tunnel, the safety of lining structure of existing high-speed railway tunnel during blasting construction of newly built rescue tunnel is judged. The research results can provide reference for similar tunnel blasting construction engineering.
【学位授予单位】：华东交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.6

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