Model tests on compensation grouting

摘要

Compensation grouting or fracture grouting has been successfully applied in several projects to compensate for surface settlements induced by for example tunnelling. Fracture grouting is planned to compensate possible settlements of buildings in Amsterdam during the construction of the tunnels for the North/South Metro Line. Fracture grouting uses hydraulic fracturing to get a heave that can compensate the settlement. Hydraulic fracturing of competent material is studied in the oil industry where it is used successfully to enhance the capacity of oil wells. Hydraulic fracturing can also be an unwanted phenomenon in tunnelling or horizontal drilling when high pressures can cause a blowout that starts with a hydraulic fracture.