Abstract
In this paper, areas of soil disturbed by pipe jack construction are categorized and analyzed in detail. Mechanisms of soil disturbance are discussed and patterns of soil deformation are studied using random medium theory. Lateral deformations in deep soil, pore water pressures, stratified settlement, and earth pressures are investigated using measurements from an electrical transmission pipeline project in China. The measurements show that soil layer movement can be predicted by monitoring changes in pore water pressure, and the amplitude of soil disturbance transverse to the pipeline is larger than that above the pipeline in this project. The distributions of stress components in the direction of, and vertical to, the pipeline axis are studied by numerical simulation. It shows that the closer to the pipeline axis, the greater the additional stress, the faster the attenuation speed, and the smaller the range of influence. Relationships of positive propulsion, friction, and stratum loss with longitudinal and transverse surface deformations are also discussed. The ground displacement is a coupling of the three factors to the action of the soil. The surface transverse subsidence with a main influence range of about ±4 D (D is outer diameter of pipe jacking). The findings from this study can be used as technical foundation and reference for the construction of similar projects.
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Abbreviations
- CX1 :
-
Number of oblique pipe
- D :
-
Outside diameter of pipe jacking
- dζdη :
-
Represents the unit body
- FC1 :
-
Number of stratified settlement
- H :
-
Depth from the center of the pipeline to the surface
- h :
-
Tunnel axis buried depth
- i :
-
Width coefficient of land subsidence tank
- K1 :
-
Number of pore water pressure
- L :
-
Tunnel axis to the settlement tank edge point distance
- n :
-
Ratio between the volume of output soil and actual excavation volume
- R :
-
Excavation radius of tunnel
- r :
-
The radius of the tunnel
- T1:
-
Number of earth pressure
- β :
-
Main influence angle of the surrounding rock
- η :
-
Percentage of soil loss
- θ :
-
Internal friction angle of the soil
- σ r :
-
The minimum principal stress
- σ θ :
-
The principal stress
- σ 0 :
-
The natural stress
- \(\overline \varphi \) :
-
Weighted average value of soil friction angle
- Ω :
-
Area of the excavation area of pipe jacking construction
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant Nos. 51778485 and 51608384), and the Scientific research project of Shanghai Science and Technology Commission (Grant No.19DZ 1201004).
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Ma, W., Wang, B., Wang, X. et al. Soil Layer Disturbance Caused by Pipe Jacking: Measurement and Simulation of a Case Study. KSCE J Civ Eng 25, 1467–1478 (2021). https://doi.org/10.1007/s12205-021-2262-4
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DOI: https://doi.org/10.1007/s12205-021-2262-4