正弦荷载和列车荷载下地铁环境振动减振措施数值模拟研究  

Numerical simulation research on metro environmental vibration and vibrationreduction measures under sinusoidal load and train load

作　　者：李旭东 马笑遇 叶海坪 俞波 刘德声 袁宗浩 LI Xudong;MA Xiaoyu;YE Haiping;YU Bo;LIU Desheng;YUAN Zonghao(Hangzhou Metro Development Co.,Ltd.,Hangzhou 310021,China;Hangzhou Xiyu Real Estate Co.,Ltd.,Hangzhou 310024,China;Hongrun Construction Group Co.,Ltd.,Hangzhou 310000,China;College ofCivil Engineering,Zhejiang University of Technology,Hangzhou 310023,China)

机构地区：[1]杭州地铁开发有限公司,浙江杭州310021 [2]杭州西誉置业有限公司,浙江杭州310024 [3]宏润建设集团股份有限公司,浙江杭州310000 [4]浙江工业大学土木工程学院,浙江杭州310023

出　　处：《浙江工业大学学报》2022年第3期309-317,共9页Journal of Zhejiang University of Technology

摘　　要：对地铁列车运行引起的环境振动以及减振措施进行研究,首先,应用ABAQUS数值分析软件,建立有限元-无限元隧道-土耦合模型;然后,在模型中采用单位正弦荷载进行激励,分析地表不同位置的振动加速度幅值;最后,比较了地铁隧道空沟及填充沟在不同列车荷载激振频率、隔振沟沟深、距离和填充材料等情况下的隔振效果。模拟实验结果表明:空沟的深度对隔振效果的影响很大,深度越深隔振效果越好;对于高频荷载,振动在土体衰减变快,空沟到振源的距离对隔振效果的影响不大;对于低频荷载,空沟到振源的距离增加后隔振效果明显;填充沟的填充材料刚度是影响隔振效果的关键因素,隔振材料刚度越小,其隔振性能越好。同时对实际地铁荷载进行分析,利用实测钢轨加速度获得轮轨间动力作用力,将其施加至有限元模型中,从时域和频域两个角度对比分析了填充沟的减振效果,验证了填充沟减振措施在实际工程中的适用性。In order to study the environmental vibration caused by subway and the vibration reduction measures,a finite element-infinite element tunnel-soil coupling model is established by ABAQUS.In this model,a harmonic vertical vibration source is considered and the amplitude of vibration acceleration at different locations on the ground surface is analyzed.Finally,the vibration isolation effects of an empty trench and an in-filled trench near the subway tunnel under different load frequencies,trench depths,trench distances from the source and filling materials are investigated.The results show that the depth of the empty trench has great influence on the vibration isolation effect.The deeper the depth is,the better the isolation effect is.For low-frequency loads,the isolation effect becomes better as the distance between the empty trench and the vibration source increases.However,as the load frequency increases,the vibration attenuation in the soil becomes faster and therefore the influence of empty trench distance on the vibration isolation effect becomes less obvious.For the infilled trench,the material stiffness is a key factor that affects the effect of vibration isolation.The smaller the material stiffness is,the better the isolation performance is.For real train loadings,the rail acceleration is recorded and the dynamic interaction forces between the train and the track are then calculated from a back analysis,which is input into the FEM model.The feasibility of infilled trenches as an effective vibration mitigation method is confirmed through numerical simulations in both frequency and time domain.

关 键 词：地铁振动 ABAQUS 有限元 空沟 填充沟 

分 类 号：TU435[建筑科学—岩土工程]