DOWNLOAD previous article 1. article - 2011/1next article Daniele Peila, Luca Borio and Sebastiano Pelizza

The behaviour of a two-component back-filling grout used in a tunnel-boring machine


The instantaneous filling of the annulus that is created behind the segment lining at the end of the tail during the TBM advance is an operation of paramount importance. Its main goal is to minimize the surface settlements due to any over-excavation generated by the passage of the TBM. To correctly achieve the goals, a simultaneous back-filling system and the injected material should satisfy the technical, operational and performance characteristics. A two-component system injection for the back-filling is progressively substituting the use of traditional mortars. In this paper different systems of back-filling grout and in particular the two-component system are analyzed and the results of laboratory tests are presented and discussed.


tunneling, mechanized tunneling, segment lining, settlements, back-fill grouting