A new model to predict soil pressure acting on deep burial jacked pipes

Hai-feng, Zhang; Zhang, Peng; Zhou, Wei; Dong, Shun; Ma, Baosong

doi:10.1016/j.tust.2016.09.005

Cited by 70 publications

(20 citation statements)

References 18 publications

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“…In pipe jacking, the linear factors to generate friction resistance are due to the weight of pipe (f W ), soil pressure (f s ), slurry pressure (f m ), pipe-soil cohesion (f sc ), and pipe-slurry cohesion (f mc ). Their equations can be expressed as [5,6,9,10,14,19,21,22,25,26].…”

Section: Overview Of the Existing Prediction Models Of Friction Resismentioning

confidence: 99%

“…Hypothesis 3. The excavated tunnel is unstable, the surrounding soil collapses and is in full contact with the whole area of the jacking pipes (see Figure 2c) [5,6,9,21,26].…”

Section: Hypothesismentioning

confidence: 99%

“…To calculate Equation 18, the vertical soil stress σ v has to be first determined. It is noted that at the present time, by far the most commonly used model for soil pressure calculation is Terzaghi's silo model (Equation (22)) [5,6,9,19,21,26]. According to Equation (22), the calculation of the vertical soil stress requires some physical parameters that may be determined with some accuracy, such as the height of cover h, the cohesion c s , and the unit weight of soil γ, but also some empirical parameters, such as b, δ, and K. The definition of these empirical parameters varies from one author to another.…”

Section: Calculation Of Friction Resistance For Slurry Pipe Jackingmentioning

confidence: 99%

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Prediction of Friction Resistance for Slurry Pipe Jacking

Peng

Zhou

et al. 2019

Applied Sciences

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Friction resistance usually constitutes one of the two main components for the calculation of required jacking force. This paper provides a new approach to predict the friction resistance of slurry pipe jacking. First, the existing prediction equations and their establishment methods and essential hypotheses used were carefully summarized and compared, providing good foundations for the establishment of the new model. It was found that the friction resistance can be uniformly calculated by multiplying an effective friction coefficient and the normal force acting on the external surface of the pipe. This effective friction coefficient is introduced to reflect the effect of contact state of pipe-soil-slurry, highly affected by the effect of lubrication and the interaction of pipe-soil-slurry. The critical quantity of pipe-soil contact angle (or width) involved may be calculated by Persson’s contact model. Then, the equation of normal force was rederived and determined, in which the vertical soil stress should be calculated by Terzaghi’s silo model with parameters proposed by the UK Pipe Jacking Association. Different from the existing prediction models, this new approach has taken into full consideration the effect of lubrication, soil properties (such as internal friction angle, cohesion, and void ratio), and design parameters (such as buried depth, overcut, and pipe diameter). In addition, four field cases and a numerical simulation case with various soils and design parameters were carefully selected to check out the capability of the new model. There was greater satisfaction with the measured data as compared to the existing models and the numerical simulation approach, indicating that the new approach not only has higher accuracy but is also more flexible and has a wider applicability. Finally, the influence of buried depth, overcut, and pipe diameter on the friction resistance and lubrication efficiency were analyzed, and the results can be helpful for the future design.

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Section: Overview Of the Existing Prediction Models Of Friction Resismentioning

confidence: 99%

“…Hypothesis 3. The excavated tunnel is unstable, the surrounding soil collapses and is in full contact with the whole area of the jacking pipes (see Figure 2c) [5,6,9,21,26].…”

Section: Hypothesismentioning

confidence: 99%

Section: Calculation Of Friction Resistance For Slurry Pipe Jackingmentioning

confidence: 99%

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Prediction of Friction Resistance for Slurry Pipe Jacking

Peng

Zhou

et al. 2019

Applied Sciences

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“…To calculate the soil load for sewage pipelines built using the pipe jacking method, Terzaghi's theory and it's modified versions are applied [21]. Vertical soil load Influence of Soil Deformation Caused by Mining on Sewage Pipelines Built Using The Pipe Jacking Method 149 p vs on the top of pipes is determined with the following dependence [3,8,17]: 3 calculate the soil load for sewage pipelines built using the pipe jacking method, Terzaghi's and it's modified versions are applied [21]. Vertical soil load vs p on the top of pipes is ined with the following dependence [3,8,17]:…”

Section: Influence Of Mining Soil Deformations On Sewage Pipelines Bumentioning

confidence: 99%

Influence of Soil Deformation Caused by Mining on Sewage Pipelines Built Using The Pipe Jacking Method

Kalisz

Zięba

2018

Studia Geotechnica Et Mechanica

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This paper discusses the issues associated with the influence of underground mining operations on sewage pipelines built using the pipe jacking method. At present, to build sewage pipelines, especially in urban areas and deep embedment, trenchless technologies are employed. Mainly in these technologies, pipes are jacked into a bored tunnel using hydraulic jacks. These methods are also applied in mining areas.The aim of this paper is to analyse the influence of ground deformation, caused by mining operations, on sewage pipelines built using the pipe jacking method. The type of pipelines discussed here is built with butted sections, which cannot compensate the influences of mining operations in pipe joints if horizontal compression occurs in the near-surface layer of soil. Pipelines embedded in trenches in the mining areas are secured against the influence of mining operations with expansion joints, which compensate for ground deformation. Hence, in the analysis of the influence of soil deformation caused by mining on sewage pipelines built using jacking method, special attention was paid to the performance of pipe joints. Pipelines of the type are subjected to additional loads and displacements, caused by soil deformations like horizontal strains, horizontal soil displacements and surface curvatures. We propose a way to consider the influence of mining operations on sewage pipelines built using the pipe jacking method.

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“…The stability of a shallow tunnel may be affected by variations in pressure that result from a rise in the groundwater level. However, the ground above a tunnel is usually assumed to be in a fully dried or fully saturated state in practical designs so that classical theories 1 can be applied to evaluate loosening earth pressures 2,3 . Although numerical methods can be used to investigate the detailed behavior of ground during tunneling, 4,5 they require many parameters, and those based on the mechanics of unsaturated soils have yet to be applied to tunneling problems.…”

Section: Introductionmentioning

confidence: 99%

A theory of loosening earth pressure above a shallow tunnel in unsaturated ground

Kikumoto

Cui

2020

Num Anal Meth Geomechanics

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A theory is proposed to evaluate the loosening earth pressure (vertical earth pressure after excavation) acting on a shallow tunnel in unsaturated ground with an arbitrary groundwater level. The theory is developed based on the limit equilibrium theory, combining soil-water characteristic curves, Mohr-Coulomb failure criteria, and effective stress for unsaturated soils. The proposed theory is applied to predict the vertical distribution of loosening earth pressure in unsaturated ground, which shows a significant difference from that in saturated ground. In unsaturated ground, suction contributes to the increase in effective loosening earth pressure and shear resistance. The remarkable effects of groundwater depth, soil type, and scale of overburden height and trapdoor width on loosening earth pressure are also revealed. Based on the soil-water characteristic curve, the degree of saturation decreases, which causes wet density to decrease and the total and effective loosening earth pressures to have contrary tendencies. Moreover, effective loosening earth pressures vary with soil type as the degree of saturation varies. The total loosening earth pressures are, however, very similar regardless of soil type, because wet density and shear resistance have similar tendencies. The proposed theory provides a valid model for loosening earth pressure in unsaturated ground that will be useful for shallow tunnel excavations. K E Y W O R D Slimit equilibrium theory, loosening earth pressure, modeling, shallow tunnel, unsaturated ground

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A new model to predict soil pressure acting on deep burial jacked pipes

Cited by 70 publications

References 18 publications

Prediction of Friction Resistance for Slurry Pipe Jacking

Prediction of Friction Resistance for Slurry Pipe Jacking

Influence of Soil Deformation Caused by Mining on Sewage Pipelines Built Using The Pipe Jacking Method

A theory of loosening earth pressure above a shallow tunnel in unsaturated ground

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