Prediction of Friction Resistance for Slurry Pipe Jacking

Abstract

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.

Special Issue on “Buildings and Structures under Extreme Loads”

“…In particular, [14] deals with the determination of Young modulus in bored piles, while [15] presents an investigation on the horizontal axis deviation of a small radius Tunnel Boring Machine (TBM). In this context, it is important to also mention the study in [16], and reporting on the friction resistance for slurry pipe jacking. Finally, an interesting analysis on the effects of derailment and post-derailment of trains is presented in [17], with the support of full-scale testing.…”

Comparative research on the pipe-soil frictional resistances of circular and rectangular pipe sections during trenchless pipe jacking

“…(2) How to effectively reduce the pipe-soil frictional resistance during pipe jacking process? At present, the common practice is to inject thixotropic mud into the gap between the outer wall of pipe sections and the formation, so that the slurry jacket is formed around the outer wall of pipe sections to achieve the effect of lubrication and friction reduction [ 1 – 5 , 9 – 12 , 16 ].…”

“…Ma proposed a new pipe-soil contact model for rectangular pipe-jacking for friction force prediction under the lubricant applied condition, and a numerical simulation was conducted using the finite element method to verify the proposed model [ 10 ]. Ye provided a new approach to predict the friction resistance of slurry pipe jacking, the influence of buried depth, overcut, and pipe diameter on the friction resistance and lubrication efficiency were analyzed [ 16 ]. Kong discussed the frictional resistance of rectangular pipe jacking under the pipe-slurry-soil contact state by using theoretical calculation, field monitoring and FLAC 3D numerical simulation, the research results are in good agreement with the actual situation [ 21 ].…”

“…Currently, the main estimation methods of jacking force include theoretical analysis, experimental test, theoretical calculation equations, empirical estimation equations, and field monitoring, etc. However, each estimation method has its own applicable conditions and limitations, it is difficult to provide a general guidance for pipe jacking engineering practice [1][2][3][4][5][10][11][12][13][14][15][16][17][18][19]. (2) How to effectively reduce the pipe-soil frictional resistance during pipe jacking process?…”

Orthogonal Design and Microstructure Mechanism Analysis of Novel Bentonite Polymer Slurry in Pipe Jacking

“…In pipe jacking engineering, the synchronous grouting method is extensively employed in the construction of municipal and river-crossing pipeline engineering all over the world. It is also called slurry pipe jacking [ 1 , 2 , 3 , 4 ]. The pipeline segments are lifted smoothly and effectively thanks to the thixotropy properties of the synchronous grouting slurry.…”