地铁荷载引起的盾构隧道及土层长期沉降研究  

Long-term Settlement of Shield Tunnel in Soft Clay Due to Vehicle Vibration

作　　者：张冬梅[1,2] 李钰[2] 

机构地区：[1]同济大学岩土及地下工程教育部重点实验室,上海200092 [2]同济大学地下建筑与工程系,上海200092

出　　处：《防灾减灾工程学报》2015年第5期563-567,共5页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51278379);国家基础研究计划"973项目"(2011CB013800)资助

摘　　要：在软土地区,投入运营的地铁盾构隧道会因各种原因产生长期沉降,构成影响隧道结构和运营安全的关键问题,而地铁荷载被认为是影响隧道长期沉降的重要因素之一。基于此,以上海地铁一号线为例,采用有限差分软件FLAC3D建立土层-隧道-道床的三维模型,采用人工数定激励函数来模拟地铁列车荷载,通过编写FISH语言施加动载,在不考虑及考虑地下水影响两种工况下,分别进行动力计算及动力流-固耦合计算,最后结合经验拟合模型计算出长期沉降量,分析了列车荷载对隧道及周围软土长期沉降的影响规律。In soft soils,the long-term settlement of shield tunnel induced by various factors has been a major threat to the tunnel safety.The vehicle vibration is one of the key factors inducing the long-term settlement of shield tunnel.In this paper,the effect of vehicle vibration coupled with underground water was studied using the finite difference software（FDM）FLAC.The vehicle dynamic load was simulated by Artificial Numbered Excitation Function and implemented by using FISH language（an embedded language of FLAC）.The dynamic calculation and dynamic flow-solid coupling calculation were conducted combined with the empirical method,respectively,to sort out the impact of train load from underground water.The impact of underground water on the long-term behavior of shield tunnel was highlighted.The long-term settlements of shield tunnel and ground caused by the vehicle vibration increased more significantly in the first 10 years of operation.The existing of underground water could increase the long-term settlement slightly.

关 键 词：盾构隧道 列车荷载 长期沉降 数值模拟 

分 类 号：O353.1[理学—流体力学] TU81[理学—力学]