摘要
针对地下通道穿越轨道交通施工易导致既有线路出现结构失稳问题,以某一地下隧道穿越既有轨道工程为对象,通过选取5个典型的施工节点来进行结构稳定性分析,利用有限元软件和工程实测值对比分析获得不同施工节点下隧道的变形位移参数,研究结果表明:随区间隧道开挖进行,地表沉降值和竖向位移不断增大;在上台阶开挖至线路正下方阶段,各测点沉降变化速率较快,占总位移量的70%。二衬施工完成后,产生竖向最大位移量,最大位移位于新建隧道左上既有车站底板中部。隧道开挖后,通过对线下土体进行注浆加固处理易使得既有线路站台整体上浮,在一定程度上有利于对后续结构整体的沉降控制,同时既有线路结构沉降集中在上导洞开挖段,当上导洞临时仰拱形成后,后续施工段对既有线的影响减小。
Aiming at the problem of structural instability of underground tunnel passing through rail transit,this paper takes an underground tunnel passing through the existing rail project as an example,analyzes the structural stability by selecting five typical construction nodes,and obtains different construction nodes by using finite element software and engineering measured value comparison analysis.The results show that the ground settlement and vertical displacement increase with the excavation of the tunnel,and the subsidence rate of each measuring point is faster,accounting for 70% of the total displacement when the upper step is excavated to the lower part of the line.The maximum displacement is located in the middle of the floor of the existing station on the left of the new tunnel.After the tunnel is excavated,it is easy to make the existing railway platform float as a whole through grouting reinforcement,which is beneficial to the settlement control of the follow-up structure to a certain extent.At the same time,the settlement of the existing railway structure is concentrated in the excavation section of the upper pilot tunnel,when the upper pilot tunnel is near.After the inverted arch is formed,the influence of the subsequent construction section on the existing line decreases.
作者
王申
WANG Shen(Zhengzhou Municipal Engineering Corporation,Zhengzhou,Henan 450000,China)
出处
《公路工程》
北大核心
2019年第1期161-165,共5页
Highway Engineering
关键词
地下隧道
深孔注浆
隧道沉降
underground tunnel
deep hole grouting
tunnel settlement
