倾斜基岩条件下铁路交通对桩周土体振动的影响

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL Geomechanics and Engineering Pub Date : 2021-01-01 DOI:10.12989/GAE.2021.24.2.143
Xuan Ding, Li-ming Qu, Jin-chuan Yang, Chenglong Wang
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引用次数: 1

摘要

轨道交通线路通常要经过许多地形复杂的山区。研究了倾斜基岩对列车诱发土体振动响应的影响。通过模型试验,对比分析了倾斜基岩和水平基岩条件下的振动衰减。建立三维数值模型进行参数分析。结果表明,在水平基岩条件下,不同方向的峰值速度基本相同,而在倾斜基岩条件下,峰值速度变化明显。倾斜基岩条件下的峰值速度值较大。峰值速度随深度先增大后减小,振动衰减曲线随深度呈二次抛物线趋势。地形条件对振动响应有显著影响,倾斜土面主要影响浅层土。基岩倾角对峰值速度和振动衰减的影响与地表方向有关。随着土层厚度的增加,峰值速度减小,达到桩长的173%时,基岩倾斜的影响可以忽略不计。
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Soil vibration induced by railway traffic around a pile under the inclined bedrock condition
Rail transit lines usually pass through many complicated topographies in mountain areas. The influence of inclined bedrock on the train-induced soil vibration response was investigated. Model tests were conducted to comparatively analyze the vibration attenuation under inclined bedrock and horizontal bedrock conditions. A three-dimension numerical model was built to make parameter analysis. The results show that under the horizontal bedrock condition, the peak velocity in different directions was almost the same, while it obviously changed under the inclined bedrock condition. Further, the peak velocity under inclined bedrock condition had a larger value. The peak velocity first increased and then decreased with depth, and the trend of the curve of vibration attenuation with depth presented as a quadratic parabola. The terrain conditions had a significant influence on the vibration responses, and the inclined soil surface mainly affected the shallow soil. The influence of the dip angle of bedrock on the peak velocity and vibration attenuation was related to the directions of the ground surface. As the soil thickness increased, the peak velocity decreased, and as it reached 173% of the embedded pile length, the influence of the inclined bedrock could be neglected.
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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