Study on key techniques used for the shield tunnel of the Lanzhou metro crossing below the Yellow River

被引：0
作者：
机构：
[1] Shaanxi Provincial Key Laboratory for Highway Bridge & Tunnel, Chang'an University, Xi'an
[2] Urban Transit & Architecture Design Department of China Railway First Survey & Design Institute Group Co., Ltd., Xi'an
来源：
| 2015年 / Editorial By Modern Tunnelling Technology, China卷 / 52期
关键词：
Erosion; Longitudinal rigidity; Sandy cobble ground; Seismic stability; Shield tunnel; The Yellow River;
D O I：
10.13807/j.cnki.mtt.2015.06.004
中图分类号：
学科分类号：
摘要：
The shield tunnel section of Lanzhou metro line 1, which crosses below the Yellow River, is located in water-rich sandy cobble ground and therefore faces many technical problems. First, in order to satisfy the design requirements of the tunnel profile, the maximum erosion line is calculated with consideration of the influence of the existing piers at the tunnel site and based on various maximum erosion depth components. Then, after analyzing tunnel longitudinal settlement laws by a modified equivalent continuous model, it is determined that the longitudinal rigidity of the tunnel has a small effect on the longitudinal strain, and increasing the connection stiffness between segment rings has a small effect on deformation control. Although the tunnels crossing below the Yellow River are subjected to different erosion conditions, they have the same longitudinal settlement laws, and the differential settlement is mainly concentrated in the transition zone of the riverbed. Based on the analysis of the internal force of a lining under seismic effects, it is determined that the lining structure is subjected to a compression load with little eccentricity, and the seismic stability of the tunnel meets the relative requirements. Finally, the rationality of double-sealing devices for the segment joint and single-layer lining is verified by calculations. © 2015, Editorial Office of Modern Tunnelling Technology". All right reserved."
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页码：20 / 27
页数：7
相关论文
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