The success of a grouting in the underground works inevitably involves the execution of a trial plot which allows the various project stakeholders to understand the specificities of grouting that should be made. The aim of this work is to relate the experience that is a sheet of trial plot, performed prior to actual works. In addition, this work presents the (teachings of works), through the analysis and interpretation of results. These results confirmed some doubts reported before (the starting the trial plot). Indeed, this plot allowed an optimization of the grouting project adopting the traditional grouting method that has proven the most effective technique (compared to the methods in the original project): On the one hand, the analysis of the real evolution of injections and the evolution of penetrability showed weak grout absorptions. On the other hand, the geo-mechanical behaviour of the injected rock showed no instability or breakdown of the rock.


The ground improvement work, through grouting is increasingly performed in underground works. The adoption of this type of treatment comes down to its various applications, but also to its adaptation to all the situations that may be encountered before, during and even after the excavation works. The flexibility in the application of grouting work is still faced with difficulties to master the injection project, which depends on several factors, including those related to the type of ground, the injection parameters, and means of implementation. This complexity and the lack of reference point lead to the establishment of trial plots before starting the real work.

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