Fractures can be created in a layer of soil by means of injection. For this, injection tubes with fittings are inserted into the required soil layer. The injection fluid typically consists of a cement-based grout. The idea is to fill the fracture with a quick-gelling injection fluid as quickly as possible. That way, the fractures will be minimally compacted. By carrying this out in multiple phases, combined with adequate monitoring, the soil can be optimally compacted. This technique can also be used to compensate for subsidence of structures or soil.
Compensation grouting can be used to correct relaxation of the grain structure or subsidence. The grains of soils are tightly compacted by displacement of the soil. Subsequently, the ground level can be raised. This method can be used as a corrective measure for high-risk work that is sensitive to subsidence, such as: - settlement due to vibrations. - settlement due to passibg of a tunnel boring machines. - settlement due to leaks or major deformations.
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