Ground movements, interaction with existing structures and mitigation measures Compensation grouting: Mechanisms determining the shape of the grout body

It will be described what mechanism is responsible for a fracture in sand and how the grout properties and injection pressure determine the filter cake and what the influence is of the filter cake on the fracture behaviour. The thickness of the filter cake gives a minimum width of the fracture and using the cavity expansion theory, it is possible to relate the width of the fracture with the injection pressure. The combination of these results leads to a formula that relates the shape of the fracture to the grout properties and the sand parameters.