Seepage Behavior of Mud Slurry on Soil around Pipe in Using Pipe Jacking

Hideki SHIMADA and Kikuo MATSUI

J. fo MMIJ, Vol.113, No.9, p.669-676 (1997)

Basically, the pipe jacking system involving the pushing or thrusting of the drivage machine through concrete pipes ahead of jacks. The method utilizes the mud slurry which is formed around the pipes for stability of surrounding soil. However, it is not well understood the behavior of the soil and mud slurry around the pipes. From this point of view, this paper discusses the seepage behavior of the mud slurry on soil around the pipes by means of laboratory tests and 2-D Eulerian-Lagragian analysis. The results of this research are summarized as follows ;

1) It can be applied to the seepage behavior of the mud slurry by using 2-D Eulerian-Lagragian analysis.

2) Large slurry permeation zone tends to form thick mud screen around the pipe.

3) The mud screen between the soil and the pipe is easily formed by high density mud slurry and high slurry pressure.

4) Once the mud screen was formed, the thickness of the mud screen increased gradually because it behaves like a filter paper under pressure.

5) Thick mud screen prevents the mud slurry from permeating into the soil.

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