Model Test Study on Metro Shield Construction Undercrossing Existing Open-Cut Tunnel

被引：0
|
作者：
Liu Y. [1 ]
Cao Y. [1 ]
Wu X. [2 ]
Fan H. [1 ]
Zhou Y. [3 ]
Song Y. [1 ]
Lin J. [2 ]
机构：
[1] School of Civil Engineering, Shijiazhuang Tiedao University, Hebei, Shijiazhuang
[2] Department of Urban Transportation, China Railway Design Corporation, Tianjin
[3] China Railway Siyuan Survey and Design Group Co., Ltd.,, Zhejiang Branch, Zhejiang, Hangzhou
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2024年 / 45卷 / 01期
关键词：
Buried depth; Model test; Settlement law; Shield tunnel construction for metro; Undercrossing existing tunnel;
D O I：
10.3969/j.issn.1001-4632.2024.01.11
中图分类号：
学科分类号：
摘要：
In order to investigate the influencing laws of shield construction on the structure and stratum deformation of the existing tunnels, this paper took the proposed Shijiazhuang Metro Line 5 undercrossing the existing six-line tunnel of Beijing-Shijiazhuang Expressway as the engineering background, formulated the stratum and structure model test materials based on the geometric similarity ratio, and designed the test monitoring system. The construction process of shield tunnel undercrossing the existing six-line tunnel at different depths was experimentally simulated using a small shield tunneling machine with the diameter of 1, 200 mm. The settlement and deformation laws of the existing six-line tunnel and the soil layer during the undercrossing process was also analyzed. The results show that the settlement of the stratum decreases with the increase of the distance between the bottom strata of the existing tunnel and the shield tunnel vault. The influence range of shield construction on the stratum is about 1.5 times of the tunnel diameter, and the significant impact area is 1 time of the tunnel diameter. With the increase of the burial depth, the settlement of the stratum below the structure caused by the shield construction decreases. The maximum difference in settlement when the distance from the shield tunnel vault is 1 and 1.5 times of the tunnel diameter is 31.25%. The existing six-line tunnel and the stratum underneath the structure are decoupled, and the settlement of the stratum in the stage of the shield tail decoupling is greater than 80%. © 2024 Chinese Academy of Railway Sciences. All rights reserved.
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页码：110 / 121
页数：11
相关论文
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