Research on the Measures of Shield Closely Crossing Large Section Tunnel under Trunk Road

被引：0

作者：

Peng, Hua ^{[1
]}

Peng, Xu ^{[1
]}

Li, Ziehen ^{[1
]}

Xiao, Xiaoqi ^{[1
]}

Liu, Xiaolei ^{[1
]}

Ni, Anchen ^{[1
]}

Jiang, Hualong ^{[2
]}

机构：

[1] Beijing Jiaotong University, Beijing,100044, China

[2] China Railway 18th Bureau Group Municipal Engineering Co. Ltd, Tianjin,300222, China

来源：

Journal of Railway Engineering Society | 2023年 / 40卷 / 07期

关键词：

Concrete construction - Excavation - Grouting - Mortar - Roads and streets - Steel fibers - Subways - Tunnels;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Research purposes: For the problem of difficult deformation control in the project of crossing the existing large section tunnel under the city trunk road in the sensitive urban area, this paper takes the Beijing Metro Line 19 tunnel under the existing Line 1 under the city trunk road as the background, with such unfavorable factors like close crossing, tunnel second lining concrete without reinforcement, long construction age, crack disease, and hard and soft stratum. The project crossing adopts the combination of small guide hole grouting outside the hole, and aramid cloth and steel plate reinforcement inside the tunnel. At the same time, the project determines the best shield parameters for crossing through analytical calculations and test sections, and numerical analysis of the crossing measures is carried out before construction, which plays a guiding role in determining the crossing scheme and parameters. After construction, the feasibility of the control measures and the accuracy of the numerical calculation are verified by comparing and analyzing the monitoring results. Research conclusions: (1) The project adopts small guide hole excavation grouting reinforcement measures which can reduce the settlement, and meet the requirements of deformation control. (2) The structural reinforcement measures of steel plate + aramid cloth in the tunnel can effectively increase the stiffness of the existing subway tunnel and reduce the structural stress. (3) The optimal values of soil pressure and synchronous grouting pressure are 0. 08 ~0. 10 MPa and 0.20 ~0.24 MPa. (4) The deviation rate between numerical simulation and field monitoring results is not more than 15. 0%, which can effectively predict the influence of shield construction on the deformation of existing structures. (5) The research results can provide technical support for the design and construction of control measures for similar crossing projects. © 2023 Editorial Department of Journal of Railway Engineering Society. All rights reserved.

引用

页码：86 / 92