仙女岩隧道出口下穿油气管道降振控制爆破技术研究

发布时间：2018-06-20 11:38

本文选题：管道 + 振动速度峰值　；参考：《西南交通大学》2015年硕士论文

【摘要】：仙女岩隧道出口段附近有4条埋地输油(气)管道,并且穿越中广线输气管道。在隧道掘进爆破施工过程中,爆破产生的地震效应必会对附近管道,尤其是正上方输气管道造成损伤,甚至破坏。所以,下穿管道的隧道工程掘进爆破技术的研究对现场施工具有巨大意义,同时,进一步的丰富了爆破降振设计理论。本文以上述工程为背景,通过现场爆破试验测得管道上方地表处的振动强度,对其的进行分析发现,其并不符合萨道夫斯基公式。在对爆破振动影响因素以及隧道掘进爆破技术研究的基础上,提出了孔内分段装药的掏槽爆破降振技术方案,并通过有限元软件进行了掏槽孔连续装药和分段装药数值模拟。模拟结果表明掏槽孔分段装药相比于连续装药具有明显的降振效果,掌子面地表处水平X方向最大峰值振动速度的降低约44%,垂直Y方向最大峰值振动速度降低约44.3%,隧道轴线Z方向最大峰值振动速度降低约32.9%；掏槽孔分段装药爆破产生的两段波形在传播过程中出现波形叠加,最大峰值振动速度位置后移,其衰减成波动形式变化。另外,在掏槽孔分段装药的情况下,管道—土体接触处管道和土体的振动情况具有很大的差别,管道的振动速度和频率均大土体,其顶部最大峰值振动速度约为土体的1.21倍,中部最大峰值振动速度约为1.41倍,底部最大峰值振动速度约为1.39倍；同一时刻管道的Von-Mises应力的最大值出现在管道顶部,并且不同时刻的Von-Mises应力分布规律并不一样。结合现场施工情况,以数值模拟结果为基础,对仙女岩隧道进行上台阶掏槽孔分段装药爆破设计。在现场进行爆破设计方案的试验应用,管道正上方地表处的最大峰值振动速度为0.907 cm/s,在安全允许标准范围内,同时具有工程经济效益。以仙女岩隧道为背景,研究了掏槽孔不同分段装药参数的爆破振动情况。在药量相同的情况下,外侧装药小于内侧装药更有利于降低爆破振动；在距爆源较远处的振动峰值受到内装药量的影响。
[Abstract]:There are 4 buried oil (gas) pipelines near the exit of Xianyan Tunnel and pass through the gas pipeline of Zhongguang Line. In the process of tunneling blasting, the seismic effect caused by blasting will damage or even destroy the nearby pipeline, especially the gas pipeline directly above the tunnel. Therefore, the study of tunneling blasting technology of the undercut pipeline is of great significance to the field construction, at the same time, it further enriches the design theory of blasting vibration reduction. In this paper, the vibration intensity of the surface above the pipeline is measured by field blasting test under the above engineering background. The analysis shows that it does not accord with the Sardovician formula. On the basis of the research on the influence factors of blasting vibration and tunneling blasting technology, this paper puts forward the technical scheme of reducing vibration by cutting blasting of segmented charge in hole, and carries out numerical simulation of continuous charge and segmented charge in cut hole by finite element software. The simulation results show that the segmented charge in the cut hole has obvious vibration reduction effect compared with the continuous charge. The maximum peak vibration velocity of horizontal X direction is decreased about 44%, the maximum peak vibration velocity of vertical Y direction is decreased about 44.3%, the maximum peak vibration velocity of tunnel axis Z direction is reduced about 32.9%. In the process of propagation, the waveform of two sections produced by the blasting of the cut hole is superimposed, the position of the maximum peak vibration velocity is moved backward, and its attenuation changes into the fluctuation form. In addition, the vibration of pipeline and soil at the contact between pipeline and soil is very different in the case of segmented charge in cut hole. The vibration velocity and frequency of pipeline are both large, and the maximum peak vibration velocity at the top is about 1.21 times of that of soil. The maximum peak vibration velocity in the middle part is about 1.41 times and the maximum peak vibration velocity in the bottom is about 1.39 times, and the maximum Von-Mises stress appears at the top of the pipeline at the same time, and the Von-Mises stress distribution law is not the same at different times. Based on the results of numerical simulation, the blasting design of segmental charge in the upper step cut hole of Xianyuan tunnel is carried out. The maximum peak vibration velocity of the pipeline directly above the surface is 0.907 cm / s, which is within the safety allowable standard and has the engineering economic benefit at the same time. In this paper, the blasting vibration of different sectional charge parameters in the cut hole is studied with the background of Xianyan tunnel. In the case of the same amount of charge, the lateral charge is less than the inner charge, and the vibration peak at a distance from the source of the explosion is affected by the quantity of the inner charge.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.6

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