盾构施工过程诱发振动振源特性

发布时间：2018-02-13 17:40

本文关键词： 砂卵石地层盾构施工振动识别频谱特性　出处：《北京工业大学学报》2014年12期 　论文类型：期刊论文

【摘要】：以北京地铁某线区间盾构隧道为背景,结合现场调查和初步实测,识别出盾构施工诱发振动的主要振源为刀盘与地层相互作用、渣土/管片运输车辆、盾构内部设备引起的振动.通过现场实测与数值模拟分别对振源的特性展开研究,结果表明:刀盘掘进诱发振动频带较宽,主频主要集中于20~90 Hz;后配套车信号振动幅值较小,幅值较大的频带带宽为0~20 Hz;运输车由于临时轨道均直接与隧道结构接触并相互作用,使得中高频未得到衰减,幅值较大频率主要集中于70~90 Hz,振动传至地表后主频衰减至20 Hz以下,振动影响范围主要为隧道中线15 m范围内.研究结果对北京、成都、沈阳等砂卵石地层盾构施工所诱发振动具有借鉴作用.
[Abstract]:Based on the background of shield tunneling in a certain section of Beijing Metro, combined with field investigation and preliminary measurement, it is recognized that the main vibration source of shield construction vibration is the interaction between cutter head and stratum, and the residual soil / segment transport vehicle. Vibration caused by internal equipment of shield machine. The characteristics of vibration source are studied by field measurement and numerical simulation respectively. The results show that the frequency band of vibration induced by cutter head driving is wider, the main frequency is mainly concentrated at 2090 Hz, and the amplitude of vibration of rear matching car signal is small. The bandwidth of the larger amplitude is 0 ~ 20 Hz. Because the temporary track is directly in contact with the tunnel structure and interacts with the tunnel structure, the medium and high frequency is not attenuated. The larger amplitude frequency is mainly concentrated in 70 ~ 90 Hz, the main frequency attenuates below 20 Hz after the vibration is transmitted to the surface, and the vibration influence range is mainly within 15 m range of the tunnel midline. The results of the study are applied to Beijing, Chengdu, China, China, China, China, China, China, China, China, China. The vibration induced by shield construction in Shenyang and other sand and gravel strata is useful for reference.
【作者单位】：北京工业大学建筑工程学院;中建三局人防与地下空间设计院;北京市轨道交通建设管理有限公司;
【基金】：国家自然科学基金资助项目(51038009)
【分类号】：U455.43

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