摘要
随着现代工业对环境稳定性和设备精度要求的不断提高,研究瞬时竖向冲击荷载作用下基础振动的传播规律以及减振隔振措施,对于保障设备的稳定运行和环境的舒适度具有重要意义。基于某大型精密实验室的地基基础工程设计,开展了有、无橡胶减振层的基础响应模型试验,并建立了三维有限元模型。研究结果表明,在基础底部设置橡胶减振层可以显著减小地基土的加速度以及基础和基坑的位移。对比橡胶、沥青和砂砾石3种减振层材料发现,橡胶减振层在减小振动响应方面效果最佳。增加减振层厚度能够降低地基土加速度峰值以及基础和基坑位移峰值,其中位移的减小效果随减振层厚度的增加而逐渐减弱。综合考虑减振效果和经济成本,宜选择0.9~1.2 m厚的橡胶减振层。
As modern industry demands greater environmental stability and equipment precision,studying the propagation of foundation vibration under instantaneous vertical impact loads and investigating vibration reduction and isolation measures are crucial for ensuring equipment operation stability and environmental comfort.Based on the foundation design of a large precision laboratory,model tests foundation response with and without rubber vibration isolation layers were carried out,and a 3D finite element model was established.Results show that a rubber isolation layer at the foundation base significantly reduces subgrade soil acceleration and the displacement of the foundation and foundation pit.Among rubber,asphalt,and gravel isolation materials,rubber is most effective in reducing vibration responses.Increasing the isolation layer thickness lowers peak subgrade soil acceleration and peak displacement of the foundation and foundation pit,but the displacement reduction effect diminishes with greater thickness.By balancing vibration reduction effectiveness and economic cost,it is found that a rubber damping layer thickness of 0.9 to 1.2 meters is optimal.
作者
毛卉敏
谢忠球
张新胜
卜晋熙
MAO Hui-min;XIE Zhong-qiu;ZHANG Xin-sheng;BU Jin-xi(School of Civil Engineering,Central South University of Forestry and Technology,Changsha 410004,China)
出处
《河南城建学院学报》
2025年第4期43-49,77,共8页
Journal of Henan University of Urban Construction
基金
湖南省研究生科研创新项目(CX20240691)
中南林业科技大学研究生科研创新基金(2024CX02098)。
关键词
瞬时竖向冲击荷载
设备基础
减振层
动力响应
instantaneous vertical impact load
equipment foundation
vibration isolation layer
dynamic response
