Abstract:
Every tunnel project is unique, and different demands related to allowable water inflow reflect the planned use of the tunnel and its specific location. A tunnel that is tight enough for its purpose is the principal objective, since this caretakes the relations to functionality and surface structures and environment. The adverse consequences and risks of a tunnel with high water ingress in urban areas, in many cases overshadow aspects regarding construction time and costs. In the recent years there has been an advancement of grouting rigs and software for cement-based rock mass grouting in Scandinavia, that allows better control of the grouting process, but there is still a demand for a leap in the digitalization of grouting. Appropriate data logging on the grouting rigs, combined with tailored software to analyze the grouting progress and overall performance, increase the understanding of the grouting progress. Such technology will provide the necessary tools needed to quickly adapt the grouting to the site conditions and reduce construction time, costs, and unnecessary consumption of cement, thereby reducing the environmental impact. Research has indicated that hydraulic jacking of fractures during rock mass grouting is related to high consumption of grout and time, and identification of such events is considered to be an important tool to optimize the grouting progress. Many authors have presented different methods to indicate occurrences of hydraulic jacking by analyzing the grouting logs, but little research has been performed to verify these occurrences. Logic Grouting is a commercialization project where high resolution data logging and new methods for interpretation and verification will be fine-tuned, and eventually made available to the tunneling industry. Based on contributions from tunneling project owners, and contractors this tool will be designed to meet the practical demands at the tunneling site and to support office follow-up.