Research on the Slurry for Long‐Distance Large‐Diameter Pipe Jacking in Expansive Soil

Yang, Xian; Liu, Yang; Yang, Chao

doi:10.1155/2018/9040471

Cited by 9 publications

(9 citation statements)

References 15 publications

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“…Zhou et al [28] simulated the influence of grouting on jacking force and surface settlement in silt areas and concluded that reasonable control of slurry parameters can effectively reduce friction and control surface settlement. Yang et al [29] also obtained that if the mud performance can be improved, the jacking force in pipe jacking construction can be reduced and the jacking force can be predicted accurately. Sun et al [30] adopted the field monitoring method to analyze the key parameters in the pipe jacking construction of double line underground pedestrian passage and presented geoenvironmental impacts of the rectangular pipe jacking technology.…”

Section: Numerical Simulationmentioning

confidence: 99%

Measurement and Analysis of Settlement Induced by Rectangular Pipe Jacking in Silt Stratum

Tang

Sheng-cai

Zhu

2021

Advances in Materials Science and Engineering

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The large-scale rectangular pipe jacking technology has attracted more and more attention in the construction of urban underground pipe galleries, especially the problem of prediction and control of the surface settlement. Taking the pipe gallery project of Chengbei Road in Suzhou as an example, the settlement values of three groups of monitoring sections under the conditions of natural settlement and synchronous grouting are monitored, and the measured settlement values are compared with Peck formula and random medium theory. The results show that the Peck formula is more accurate in predicting the natural settlement within 1.5 times the pipe jacking width, while the stochastic medium theory is more accurate in predicting the settlement beyond the width. By comparing the field test and theory, the suggestions on the prediction of ground settlement of rectangular pipe jacking of large scale are put forward. The results of this study provide a basis for subsequent related research work and engineering applications.

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Section: Numerical Simulationmentioning

confidence: 99%

Measurement and Analysis of Settlement Induced by Rectangular Pipe Jacking in Silt Stratum

Tang

Sheng-cai

Zhu

2021

Advances in Materials Science and Engineering

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“…Friction resistance is the main component of jacking force. Application of lubricant such as bentonite slurry in pipe jacking (that is, the so-called "slurry pipe jacking") is essential to reduce the friction resistance and therefore the jacking force [3,4]. However, it does make it more complex for the calculation or prediction of friction resistance due to the change in contact conditions between the pipe and soil.…”

Section: Introductionmentioning

confidence: 99%

Calculation of Friction Force for Slurry Pipe Jacking considering Soil‐Slurry‐Pipe Interaction

Peng

Yang

et al. 2020

Advances in Civil Engineering

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This paper aims to provide a new approach to predict the friction resistance of slurry pipe jacking. Friction force usually constitutes the main component of jacking force. It can be 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. Firstly, by making some reasonable assumptions, the analytical formula of the effective friction coefficient is obtained, in which the critical quantity of contact (contact angle or width) is calculated by using the Persson contact model. Then, the analytical formula of normal force of circular pipeline is derived, which needs to determine the vertical soil pressure. To allow for a better prediction, three typical silo models are introduced and compared. Finally, a method for calculating the friction resistance of slurry pipe jacking is established. The main difference from the existing method is that this method takes into full consideration the influence of lubrication, soil properties (such as internal friction angle, cohesion, and void ratio), and design parameters (such as buried depth, overcut, and pipe diameter). By using reasonable silo models, the predicted results are in good agreement with the measured values collected from 10 in situ cases, which proves that the new approach can provide accuracy prediction of friction resistance for slurry pipe jacking with various soil conditions, and it may help for better future design and less construction costs.

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“…The main component of the jacking force is due to frictional resistance. Application of a lubricant such as bentonite slurry in pipe jacking (so-called 'slurry pipe jacking') is essential to reduce the friction resistance and, therefore, the jacking force [3,[10][11][12][13]. However, the use of slurry makes it more complex to calculate or predict the friction resistance because of the change in contact conditions between the pipe and soil and lubricant slurry.…”

Section: Introductionmentioning

confidence: 99%

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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Research on the Slurry for Long‐Distance Large‐Diameter Pipe Jacking in Expansive Soil

Cited by 9 publications

References 15 publications

Measurement and Analysis of Settlement Induced by Rectangular Pipe Jacking in Silt Stratum

Measurement and Analysis of Settlement Induced by Rectangular Pipe Jacking in Silt Stratum

Calculation of Friction Force for Slurry Pipe Jacking considering Soil‐Slurry‐Pipe Interaction

Prediction of Friction Resistance for Slurry Pipe Jacking

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