摘要
城市新建地铁隧道穿越引起既有隧道变形的规律是工程领域研究的热点。文章依托某新建盾构隧道近接下穿既有盾构隧道工程,对施工全过程的实测数据进行整理,结合数值模型计算结果,重点分析了新建左、右线依次穿越过程中既有双线隧道沉降变形规律,进一步对阶段受扰动土体稳定性进行分析。结果表明:(1)时间维度上,穿越过程中既有结构竖向变形趋势与施工阶段具有一一对应关系;(2)距离维度上,隧道结构变形随着距穿越中心距离减小而增大,规律与模拟结果一致;(3)根据既有隧道变形量及变形速率,穿越开始阶段可作为沉降控制的关键节点;(4)既有隧道穿越中心区域沉降量远小于模拟值,实际沉降变形实现重新分布,验证了施工关键节点控制的有效性和结论的准确性。
The deformation pattern of existing tunnels caused by the crossing construction of new urban rail proj⁃ects is a popular research topic in the engineering field.Based on a new shield tunnel passing under an existing one in close distance,this paper collates the actual measured data during the whole construction process.And in combi⁃nation with the calculation results of the numerical model,it mainly analyzes the settlement deformation pattern of the existing double-line tunnel during the crossing construction process of the new left and right line tunnel tubes in turn,and further analyzes the stability of the disturbed soils in each construction stage.The results show that:(1)from the time dimension,there is a one-to-one correspondence between the vertical deformation trend of the exist⁃ing structure and the construction stage during the crossing process;(2)from the distance dimension,the deforma⁃tion of the tunnel structure increases as the distance from the crossing center decreases,and the pattern is consistent with the simulation results;(3)based on the amount and rate of deformations in the existing tunnel,the start stage of the crossing construction can be taken as a key node for controlling the settlement;(4)the settlement of the center ar⁃ea crossing the existing tunnel is much smaller than the simulated value,with achieving the actual redistribution of the settlement deformation,which verifies the effectiveness of construction key node control and the accuracy of the conclusions.
作者
高利宏
GAO Lihong(Beijing Mass Transit Railway Operation Corporation Limited,Beijing 100044)
出处
《现代隧道技术》
CSCD
北大核心
2021年第4期194-202,共9页
Modern Tunnelling Technology
关键词
双线盾构隧道
近接下穿
沉降变形规律
施工控制
数值模拟
Double-line shield tunnel
Crossing under existing tunnel in close distance
Settlement deformation pattern
Construction control
Numerical simulation
