砂卵石地层盾构施工诱发振动环境影响试验研究

发布时间：2018-06-14 19:03

本文选题：砂卵石地层 + 盾构施工　；参考：《振动与冲击》2015年16期

【摘要】：针对北京西部地区砂卵石地层埋深浅、粒径大、分布广,盾构施工产生的振动易传至地表对环境产生影响等,对北京地铁某区间进行现场振动测试。通过埋设地层、地面及隧道内测点进行时间-空间同步监测,获取测试区间盾构每环掘进时的振动数据,分析振动频域特性及空间衰减规律,并对地表振动环境影响进行评价。研究表明,砂卵石地层盾构施工振动主要为刀盘刀具切割土体产生的振动,机械振动及运输车辆产生的振动对地表影响较小。刀盘附近振动主频分布于30 Hz以上,而横断面地表远离刀盘40 m处衰减至20 Hz以下。测点振幅大小与刀盘、测点间相对位置有关,地表振幅大小依次为刀盘前方测点、刀盘两侧测点、刀盘后方测点,刀盘处地表振级达80 d B,远离刀盘20~30 m时衰减至60 d B以下。
[Abstract]:In view of the shallow buried depth, large particle size and wide distribution of sand and pebble strata in western Beijing, vibration caused by shield construction is easily transmitted to the surface of the earth to affect the environment, and so on. The field vibration test is carried out on a certain section of Beijing subway. In this paper, the time-space synchronous monitoring of ground, ground and tunnel is carried out, the vibration data of each ring of shield tunneling in test section are obtained, the characteristics of vibration frequency domain and the law of spatial attenuation are analyzed, and the environmental impact of surface vibration is evaluated. The results show that the vibration of shield tunneling in sand and gravel strata is mainly caused by cutting soil with cutter, and the mechanical vibration and the vibration produced by transportation vehicles have little influence on the surface of the earth. The main frequency of vibration near the cutter head is above 30 Hz, and the cross section surface attenuates below 20 Hz from 40 m away from the cutter head. The amplitude of the measuring point is related to the relative position of the cutter head and the measuring point. The amplitude of the ground surface is in turn the measuring point in front of the cutter head, the measuring point on the two sides of the cutter head, the measuring point behind the cutter head, the surface vibration level at the cutter head is 80 dB, and the vibration level at the cutter head is below 60 dB when it is 2030m away from the cutter head.
【作者单位】：北京工业大学城市与工程安全减灾教育部重点试验室;中建三局人防与地下空间设计院;
【基金】：国家自然科技基金项目(41272337) 北京市自然科学基金重点项目(8111001)资助
【分类号】：U455.43

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