填充沟对地铁运营引起地基振动隔振效果研究  

Vibration-isolation effectiveness of in-filled trench on ground vibration induced by subway operation

作　　者：蔡袁强[1,2] 江乾明 曹志刚[1] 袁宗浩 楼佳悦 张盈哲 CAI Yuan-qiang;JIANG Qian-ming;CAO Zhi-gang;YUAN Zong-hao;LOU Jia-yue;ZHANG Ying-zhe(Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China;Institute of Geotechnical Engineering,Zhejiang University of Technology,Hangzhou 310014,China;Zhejiang Huayun Electric Power Engineering Design&Consultation Co.,Ltd.,Hangzhou 310014,China)

机构地区：[1]浙江大学滨海和城市岩土工程研究中心,浙江杭州310058 [2]浙江工业大学岩土工程研究所,浙江杭州310014 [3]浙江华云电力工程设计咨询有限公司,浙江杭州310014

出　　处：《岩土工程学报》2020年第8期1384-1392,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家重点研发计划项目(2016YFC0800200);国家自然科学基金项目(51778571,51708503);省属高校基本科研业务费项目(科技类)RF-A2019014。

摘　　要：为分析填充沟对地铁运营引起的地基振动隔振效果,建立了地铁列车–轨道结构–衬砌–地基–填充沟2.5维有限元分析模型。列车荷载模拟为一组符合列车轴载空间分布的常荷载,钢轨和浮置板简化为无限长Euler梁,衬砌与地基模拟为均质弹性体。理论模型通过钢轨与衬砌仰拱处、以及衬砌与地基处应力和位移连续条件进行耦合。混凝土填充沟模拟为地基中异质体,填充沟与地基交界面通过共用节点法处理,并在波数域中进行求解,最后通过快速Fourier逆变换(IFFT)进行波数展开获得三维时域–空间域内的地基动力响应。计算分析了填充沟在不同列车速度、填充沟沟深、沟宽与隧道埋深等情况下的隔振效果。研究表明,填充沟隔振效果随沟深增加而显著改善,但隔振效果改善速率在填充沟超过一定深度后变缓;随着填充沟距地铁距离增加,沟前隔振效果减弱,而沟后隔振效果改善。随着列车速度增加,填充沟隔振效果变好。In order to analyze the isolation effectiveness of in-filled trench to the ground vibration caused by subway operation,a coupling model,which is divided into five parts including moving train,track structure,lining,ground and in-filled trench,is established.The train load is simulated by a set of constant loads consistent with the spatial distribution of train axles.The rails and floating plates are simplified as the infinite Euler beams.The lining and ground are simulated as the homogeneous elastic media.The theoretical model is coupled by the continuous conditions for the stresses and displacements between the rail and the lining invert and those between the lining and the ground.The concrete in-filled trench is modelled as the heterogeneous medium in the ground.The interface between the in-filled trench and the ground is treated by the common node method and solved in the wave number domain.Finally,the three-dimensional dynamic response in the time-space domain is obtained by the fast inverse Fourier transform(IFFT).The vibration-isolation effectiveness of the filled trench under different train speeds,in-filled trench depths,trench widths and tunnel depths is calculated and analyzed.The results show that its vibration-isolation effectiveness is improved with the increase of the in-filled trench depth,but when the depth of the in-filled trench exceeds a certain depth,the improvement rate of the vibration-isolation effectiveness slows down.With the increase of the distance between the in-filled trench and the subway,the isolation effectiveness decreases in the area before the in-filled trench and increases in the area after the in-filled trench.With the increase of train speed,the vibration-isolation effectiveness becomes better.

关 键 词：填充沟 地铁荷载 2.5维有限元 隔振效果 移动荷载 

分 类 号：TU435[建筑科学—岩土工程]