The injection method is a geotechnical technique for ground improvement and sealing. A liquid binder — typically cement suspension, synthetic resin, or water glass — is injected under controlled pressure through boreholes into the ground. The injection fills voids, consolidates loose soils, and seals water-permeable layers.
Various methods are distinguished: pressure grouting injects into existing voids, high-pressure injection (jet grouting) creates cement columns in the soil through cutting jets, and low-pressure injection penetrates capillarily into pore spaces. The choice of method depends on soil type, groundwater conditions, and structural requirements.
Typical applications include pre-injection in tunnel construction, dam sealing, underpinning of existing buildings, and repair of cracked concrete structures. Modern injection systems operate under computer control with precise pressure and volume monitoring.