Performance of Tunnel Feet-Lock Pipe (TFP) in Sharing Vertical Foundation Load

During the tunnel construction in soft ground, the insufficient bearing capacity of tunnel foundation usually causes a series of settlement problems. Tunnel feet-lock pipe (TFP) has been widely used to take the vertical load acting at the foundation of a tunnel foot. However, the detailed bearing pe...

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Bibliographic Details
Published inKSCE journal of civil engineering Vol. 25; no. 3; pp. 1086 - 1094
Main Authors Chen, Lijun, Chen, Jianxun, Li, Yao, Luo, Yanbin, Mu, Yongjun, Hu, Taotao, Wang, Chuanwu
Format Journal Article
LanguageEnglish
Published Seoul Korean Society of Civil Engineers 01.03.2021
Springer Nature B.V
대한토목학회
Subjects
Bearing capacity
Civil Engineering
Engineering
Feet
Geotechnical Engineering & Applied Earth Sciences
Industrial Pollution Prevention
Mathematical analysis
Performance evaluation
Pipes
Quantitative research
Soft ground
Subgrade reaction
Tunnel construction
Tunnel Engineering
Tunnels
Vertical loads
토목공학
Tunnel engineering
Soft ground
Tunnel feet-lock pipe
Vertical load
Steel rib
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Summary:During the tunnel construction in soft ground, the insufficient bearing capacity of tunnel foundation usually causes a series of settlement problems. Tunnel feet-lock pipe (TFP) has been widely used to take the vertical load acting at the foundation of a tunnel foot. However, the detailed bearing performance of TFP is still not clear, and there is a lack of quantitative research. In this paper, a simple analytical approach is adopted to evaluate the performance of the TFP, and the main parameters affecting the supporting performance of the TFP are analyzed. The results show that the ϕ 42– ϕ 140 TFP with the angle of 10° can take 3.8%–40.4% of vertical load. TFP has an effective length of 1.7 m–2.8 m, which is related to the relative stiffness between the TFP and the stratum. With the increase of the installation angle, the TFP shares more vertical load. This trend is more obvious when the angle of the TFP is greater than 20°. If the proportion coefficient of the subgrade reaction coefficient is doubled, the vertical load shared by the TFP can be increased by 34%–38%. For every 10 cm increase in overbreak behind the steel rib, the vertical load shared by TFP is reduced by 16%.
ISSN:1226-7988
1976-3808
DOI:10.1007/s12205-021-1017-6