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Effects of water table on ground-borne vibration screening effectiveness by using open trenches

机译：水桌对采用开放式沟渠对地面振动筛选效果的影响

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摘要

The seasonal variations in groundwater table would significantly change the dynamic responses of the ground and the screening performances of wave barriers. This paper develops a two-dimensional finite element model based on COMSOL to describe the propagation of waves in a layered ground with open trenches. This layered ground is modelled as a dry layer resting on a saturated half-space. The influence of the moving groundwater table on isolation efficiency of barriers is then investigated, considering the infiltrated water in trenches. The effects of soil hydraulic properties and geometrical parameters of the trench are also analyzed respectively. Results show that a low value of the permeability coefficient of saturated half-space may have a significantly detrimental effect on the screening performance due to the low frequency behaviors of the medium. Placing a trench in vibration-strengthening (weakening) zones results in a better (worse) isolation effect, and with a critical water table (H-w,H-c), increasing trench depth and width can hardly achieve a satisfactory screening efficiency (75% reduction) due to the occurrence of resonance in the dry layer. In addition, a multiple trench isolation system is simulated in the condition of high water levels and its shielding performance is compared to the single trench barrier. A triple trench barrier is found to be a preferred alternative because it can achieve a much better screening efficiency. Specially for H-w,H-c, a multiple trench barrier can effectively eliminate the adverse effect of the resonance and achieve more than 75% reduction of ground vibration.
机译：地下水位的季节变化会显着改变地面的动态响应和波屏障的筛选性能。本文开发了一种基于COMSOL的二维有限元模型，以描述具有开放沟槽的层状地面的波动。该层状地面被建模为干燥层，搁置在饱和的半空间上。将移动地下水表对沟槽中渗透水的影响进行了对屏障的隔离效率的影响。还分别分析了沟槽的土壤液压性能和几何参数的影响。结果表明，由于介质的低频行为，饱和半空间的渗透系数的低值可能对筛选性能具有显着的影响。将沟槽放在振动强化（弱化）区域导致更好（更差）的隔离效果，并且具有临界水位（HW，HC），沟槽深度和宽度的增加可能几乎不能达到令人满意的筛选效率（减少75％）由于干燥层中的共振发生。另外，在高水位的条件下模拟多沟槽隔离系统，并且将其屏蔽性能与单个沟槽屏障进行比较。发现三沟屏障是一个首选的替代方案，因为它可以实现更好的筛选效率。特别是对于H-W，H-C，多沟槽屏障可以有效地消除共振的不利影响，并达到地面振动的减少超过75％。

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  • 来源
    《Soil Dynamics and Earthquake Engineering》 |2020年第4期|106031.1-106031.11|共11页
  • 作者

    Feng Shi-Jin; Li Jian-Ping; Zhang Xiao-Lei; Chen Zhang-Long; Li Yi-Cheng;

  • 作者单位

    Tongji Univ Dept Geotech Engn Minist Educ Key Lab Geotech & Underground Engn Shanghai 200092 Peoples R China;

    Tongji Univ Dept Geotech Engn Minist Educ Key Lab Geotech & Underground Engn Shanghai 200092 Peoples R China;

    Tongji Univ Dept Geotech Engn Minist Educ Key Lab Geotech & Underground Engn Shanghai 200092 Peoples R China;

    Tongji Univ Dept Geotech Engn Minist Educ Key Lab Geotech & Underground Engn Shanghai 200092 Peoples R China;

    Tongji Univ Dept Geotech Engn Minist Educ Key Lab Geotech & Underground Engn Shanghai 200092 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Groundwater level; Wave propagation; Open trench; Vibration isolation; COMSOL;

    机译：地下水位;波传播;开放式沟槽;振动隔离;COMSOL;

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