浅埋隧道开挖爆破震动监测与控制技术

发布时间：2018-05-10 07:08

本文选题：浅埋隧道 + 爆破开挖　；参考：《现代隧道技术》2014年05期

【摘要】：文章以怀长路改建工程西四渡河隧道工程爆破开挖为背景,对隧道工程开挖施工爆破地震的震动监测以及控制技术进行了研究。通过监测爆破引起的地表及结构的质点震动速度,研究了爆破地震波的传播规律并进行了频谱分析,最后提出了合理的控制技术。监测与分析结果表明:(1)质点爆破震动的速度大小与爆破单响最大药量以及测点位置到爆源中心距离密切相关;(2)下台阶在分左右两幅爆破掘进时,第一次爆破对岩石的夹制作用大、爆破震动响应较大、震动速度较高。由于第一次爆破给第二次爆破提供了新的临空面,使得爆破震动效应减小、震动速度减小;(3)爆破地震波质点震速主频的高频成分不丰富,震速主频主要分布在低频段;(4)明挖段处套拱上设置的通风窗口引起应力波的反射作用,爆破震动对钢筋混凝土套拱结构影响显著。
[Abstract]:Based on blasting excavation of Xisiduhe Tunnel Project of Huai long Road Reconstruction Project, the vibration monitoring and control technology of blasting earthquake in tunnel excavation construction are studied in this paper. By monitoring the velocity of particle vibration caused by blasting, the propagation law of blasting seismic wave is studied, and the spectrum analysis is carried out. At last, the reasonable control technology is put forward. The results of monitoring and analysis show that the velocity of blasting vibration of the particle is closely related to the maximum explosive quantity of single shot and the distance from the measuring point to the center of the blasting source. The first blasting has the advantages of large rock clamping, high vibration response and high vibration speed. Because the first blasting provides a new face for the second blasting, the blasting vibration effect is reduced, and the vibration velocity is reduced. The high frequency component of the main frequency of the blasting seismic wave velocity is not rich. The main frequency of seismic velocity is mainly distributed in the low frequency band. (4) the ventilation window on the arch in the open excavation section causes the reflection of stress wave, and the blasting vibration has a significant effect on the reinforced concrete arch structure.
【作者单位】：北京工业大学建筑工程学院;北京市道路工程质量监督站;
【分类号】：U455.6

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