Soil improvement process using jet grouting which provides high grouting material savings

摘要

The invention finds application in the field of soil improvement and particularly relates to the process known in the art as "jet grouting". Particularly, with this process, in suitable soils part of the column volume is formed in a Water-Jet (WJ) step, using 2 soil eroding fluids, air and water, and the rest of the volume is formed using cement grout jacketed in air as a soil eroding fluid to be pumped through the same nozzle in the Grout-Jet (GJ) step; these steps are both carried out in the nozzle descending stage. The slurry created during the WJ step is displaced by the backfill (rich in grouting material) during the GJ step.