ABSTRACT
The paper will describe the Hubertus Tunnel case more in detail, since this is one of the very few cases where fractures in relatively homogeneous sand at 11 m depth and 5 m below the waterline could be studied and describes the principle and results of calculation models that are developed to describe various parts of the grouting process. Possible causes of the differences between the field test and the model tests are: 1) the preconditioning has an influence. 2) the in-homogeneities in ‘real’ soil serve as a trigger for the start of the process. 3) The installation of the TAMs (TAM stand for Tube-a-Manchette, a tube with injection openings covered by a rubber Manchette through which the grout can be injected) which causes unloading of the soil has an influence. In this paper we will elaborate the 3rd possibility and mention some aspects of the 2nd. The first possibility is not dealt with in this paper.
