Grouting for sealing of hard rock
To reduce the inflow of groundwater to underground facilities, rock joints are typically sealed with cement grout during the excavation of the underground facility. Since it is difficult to assess the penetration and properties of the rock joints, as well as their interconnection, it is also, as a consequence, difficult to assess how much cement grout that is needed to achieve a tunnel that is sufficiently watertight. In addition, there are also a number of parameters affecting the grouting technique that are equally difficult to determine, such as when to stop the injection and what pumping pressure or grout type to use, to achieve the best result. Our research on grouting aims to overcome these challenges, in order to improve the possibilities for cost-effective construction of tunnels with minimum environmental impact. We have carried out research on grouting in hard rock for several decades and we have a considerable experience within the field.