摘要
借助有限差分软件FLAC3D,依托太原地铁2号线双塔西街—大南门站下穿迎泽湖区段盾构隧道工程,基于流-固耦合理论分别建立5,10,20,30 m湖水深度下该区段隧道流-固耦合三维计算模型,对比分析4种湖水深度下盾构隧道开挖过程中地表的沉降量、围岩渗透性和管片内力分布。结果表明:盾构隧道地表沉降量及水平位移随湖水深度的增大而增大;各工况下隧道周围的孔隙水压力随着盾构隧道的开挖而显著减小,水力坡降在隧道拱顶、拱腰两侧明显增大,致使隧道拱顶、拱腰两侧极易发生涌水事故;流-固耦合作用下,盾构管片内力与水头压力呈正相关性,盾构隧道管片配筋设计中应考虑上覆水体水头压力对其产生的显著影响。
With the help of finite difference software FLAC3D,relying on the shield tunnel project of Yingze Lake section under the Shuangta West Street-Dananmen Station of Line 2 of Taiyuan Metro,based on fluid-solid coupling theory,the water depths of 5 m,10 m,20 m and 30 m were established respectively,the three-dimensional calculation model of fluid-structure coupling of section tunnels was used to compare and analyze the ground settlement values,pore water pressure distribution of surrounding rocks and the stress of the segments after the excavation of the shield tunnel at four lake depths.The results of the study show that,the surface settlement and horizontal displacement of the lake bottom increase with the depth of the lake;the pore water pressure around the tunnel decreases significantly with the excavation of the shield tunnel under various operating conditions;the hydraulic slope falls on the top of the tunnel arch,the sides of the arch sill are significantly increased,making the tunnel vault and the sides of the arch sill prone to water inrush accidents;the internal force of the segment under the fluid-solid coupling effect is positively related to the water depth,the size of the overlying water depth should be considered in the design.
作者
郤保平
陈路海
董赟盛
XI Baoping;CHEN Luhai;DONG Yunsheng(College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Key Laboratory of Insitu Property Improving Mining of Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China;Jinan Urban Construction Group,Jinan 250000,China)
出处
《太原理工大学学报》
CAS
北大核心
2020年第5期634-640,共7页
Journal of Taiyuan University of Technology
基金
国家自然科学基金资助项目(51874207)
山西省自然科学基金资助项目(201701D121131)。
关键词
流-固耦合
水下隧道
盾构隧道
施工扰动
地表沉降
渗流规律
内力分布
fluid-solid coupling
underwater tunnel
shield tunnel
disturbance of construction
surface subsidence
seepage law
the internal force distribution
