Analytical solution of soil deformation caused by vertical pipe jacking construction considering grouting pressure

Area of Science:

• Geotechnical Engineering
• Civil Engineering
• Soil Mechanics

Background:

• Vertical pipe jacking is an emerging shaft construction method.
• This technique significantly impacts surrounding soil deformation.
• Understanding these deformations is crucial for infrastructure stability.

Purpose of the Study:

• To develop a comprehensive analytical model for soil deformation caused by vertical pipe jacking.
• To quantify the influence of various factors on soil deformation.
• To identify the dominant factors contributing to settlement and displacement.

Main Methods:

• Integration of Mindlin's solution and analogous stochastic medium theory.
• Derivation of analytical solutions for multi-factor soil deformation.
• Analysis of factors including grouting pressure, jacking thrust, frictional forces, and ground loss.

Main Results:

• The overall soil displacement trend is settlement, peaking around 0.5 times the pipeline diameter from the centerline.
• Ground loss is identified as the dominant factor influencing both vertical settlement and horizontal displacement.
• Other factors like grouting pressure and friction have minor effects on overall soil deformation.

Conclusions:

• A comprehensive formula for calculating multi-factor soil deformation was derived.
• Ground loss is the most critical factor affecting soil deformation during vertical pipe jacking.
• Burial depth and jacking distance also influence deformation patterns, requiring consideration in design and execution.