三峡大学学报（自然科学版）2025，Vol.47Issue(4)：53-63,11.DOI:10.13393/j.cnki.issn.1672-948X.2025.04.008
上软下硬富水地层临近既有线叠线隧道盾构始发变形数值模拟研究
Numerical Simulation Study on the Initiation Deformation of Stacked Shield in Upper Soft and Lower Hard Formations
摘要
Abstract
To verify the influence of the initiation of the new stacked shield in the soft and hard water-rich strata on the surface settlement of the end and the deformation of the adjacent tunnel segments,a three-dimensional finite element numerical model was established in this paper based on the starting end of Gangzicun Station of Nanjing Metro Line 6,and the surface settlement under four different reinforcement conditions,namely the non-reinforcement of the starting end,the grouting reinforcement of the sleeve valve pipe,the reinforcement of the triaxial mixing pile and the artificial freezing of the three-axis mixing pile,was simulated and analyzed.The simulation results show that the surface settlement reinforced by sleeve valve tube is the smallest,and the method is reasonable and feasible through actual measurement.By changing the reinforcement range of the sleeve valve tube,the horizontal and vertical clear distance between the existing line and the new stacked line,and the vertical clear distance of the new stacked line,the sensitivity analysis of the new stacked line under different working conditions was carried out.The results show that the grouting reinforcement width of the sleeve valve pipe should be more than 2 m on both sides of the tunnel arch waist.When the lower limit of the reinforcement depth of the sleeve valve pipe is 0.5D(the diameter of the tunnel)at the bottom of the tunnel and considering the surface settlement and the deformation of the downline tunnel,the upper limit of the reinforcement should be more than 0.6D at the top of the upper line tunnel,the vertical net distance of the new stacked line should be controlled at 0.3D～1.2D,and the horizontal net distance between the existing line and the new stacked line should be more than 0.6D.However,when the buried depth of the new stacked line tunnel remains unchanged,changing the vertical net distance between the existing line and the new stacked line has little effect on the deformation of the existing line segment.关键词
盾构始发/叠线隧道/数值模拟/袖阀管注浆/临近既有隧道Key words
shield starting/stacked tunnels/numerical simulation/sleeve valve pipe grouting/adjacent to existing tunnels分类
土木建筑引用本文复制引用
杨平,于游,朱俊,王加辉,何云..上软下硬富水地层临近既有线叠线隧道盾构始发变形数值模拟研究[J].三峡大学学报（自然科学版）,2025,47(4):53-63,11.基金项目
国家自然科学基金项目(42101127) （42101127）
