Calculation method of the earth pressure for parallel pipe jacking with small spacing

YANG Xian; XIAO Yu-feng; LI Yong-suo; CHEN Juan

doi:10.13374/j.issn2095-9389.2021.03.17.002

Volume 43 Issue 10

Oct. 2021

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YANG Xian, XIAO Yu-feng, LI Yong-suo, CHEN Juan. Calculation method of the earth pressure for parallel pipe jacking with small spacing[J]. Chinese Journal of Engineering, 2021, 43(10): 1376-1384. doi: 10.13374/j.issn2095-9389.2021.03.17.002

Citation:

YANG Xian, XIAO Yu-feng, LI Yong-suo, CHEN Juan. Calculation method of the earth pressure for parallel pipe jacking with small spacing[J]. Chinese Journal of Engineering, 2021, 43(10): 1376-1384. doi: 10.13374/j.issn2095-9389.2021.03.17.002

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Calculation method of the earth pressure for parallel pipe jacking with small spacing

doi: 10.13374/j.issn2095-9389.2021.03.17.002

1.
College of Resources, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
2.
School of Municipal and Geomatics Engineering, Hunan City University, Yiyang 413000, China
3.
School of Information and Electrical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China

More Information

Corresponding author: E-mail: chenjuan@hnust.edu.cn
Received Date: 2021-03-17
Available Online: 2021-06-18
Publish Date: 2021-10-12

Abstract

Abstract

With the increase in the urban underground buildings and the limitation of underground space, there are increasing double-line or even multi-line pipe jacking projects with small spacing. In the process of pipe jacking with small spacing, due to the influence of pipe-pipe interaction, the earth pressure distribution around the pipes changes greatly, which leads to difficulties in the load determination, structure calculation, and jacking force prediction and control. Combined with the back analysis of numerical simulation, based on Terzaghi’s theory of consolidation and limit equilibrium theory, the soil loosening line and the retaining line of the existing pipe are assumed, and a new calculation method of vertical earth pressure on the vault of parallel pipe jacking with small spacing is established. The effects of soil shear strength, pipe diameter, and pipe spacing on the earth pressure are analyzed, and the calculated earth pressure on the vault of the new pipe is compared with those calculated by the soil column theory and Terzaghi’s theory without considering the influence of the existing pipe. The results show that the vertical earth pressure of the new pipe jacking vault increases with the increase in the soil shear strength, but the earth pressure on both sides of the new pipe jacking decreases. When the shear strength is large, the earth pressure on the vault calculated by this method is smaller than that calculated by Terzaghi’s theory. When the shear strength is small, the earth pressure on the vault calculated by this method is larger than that calculated by Terzaghi’s theory. When the buried depth of the pipe increases, the earth pressure on the vault of the new pipe jacking increases, but compared with the soil column theory and Terzaghi’s theory, the earth pressure increment is smaller. With the increase of the spacing between the two pipes, the earth pressure on the vault of the new pipe jacking arch increases.
- pipe jacking with small spacing,
- pipe?pipe interaction,
- earth pressure,
- Terzaghi’s earth pressure theory,
- limit equilibrium theory

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References(28)

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