Pressurized injection grouting can be an effective way of increasing strength and decreasing permeability of loose coarse grained soils. Grouting is typically performed using a TAM (tube-a-manchette) where a small diameter pipe is inserted into the ground and grout is pumped through the pipe, which flows out of small diameter holes in the pipe. A 1-way membrane of sorts is used to prevent grout from flowing back into the TAM pipe. This can be used for stabilizing and preventing water inflow for tunnels constructed in loose soils, and for underpinning or stabilization of existing foundations in loose soils.
A recent LinkedIn article explains how recent advancements in TAM pipe grouting allows for pressure grouting in even fine grained sands, which improves the range of subsurface conditions in which this ground improvement method can be applied. – Mike Batten, DTC Civil Geotechnical Instructor
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