Development of compensation grouting modelling and control system

Modelling compensation grouting operations is necessary to make an efficient design of compensation work, where decisions are needed for grout spacing, injection volume and injection rate. Simulation of grouting operation within the framework of tunnel construction analysis requires some idealisation because of the difference in scale of each process. In this study, numerical modelling of a single grout injection process was performed and the issue of soil consolidation affecting the efficiency of compensation grouting is addressed. New modelling software, which can simulate and analyse tunnel excavation and compensation grouting operations, has been developed. This modelling software is part of the new compensation grouting control system, which assists the set-up of a compensation grouting scheme during the tunnelling design stage. It is also used during the construction stage to refine the predefined grouting scheme on the basis of the daily information collected on the site.