Permeation Grouting is a soil consolidation technique in which a fluid mixture (typically cement- or resin-based) is injected at low pressure to permeate the voids in the ground without altering its structure. It is used to improve strength and reduce the permeability of granular soils such as sands and gravels. Comprehensive laboratory analysis, including geomechanical characterisation of materials before and after injection using the same techniques and materials as those employed on site, enables more accurate preliminary design and precise calibration during field implementation.