Chapter
Jul 6, 2017
Soil Improvement Thanks to an Extra-Long Application of Directional Drilling
Authors: Giuseppe Di Salvo [email protected], Vittorio Manassero [email protected], Giuseppe Sichel [email protected], and Paolo Foppiani [email protected]Author Affiliations
Publication: Grouting 2017
Abstract
The paper deals with a soil improvement by grouting carried out through tubes à manchettes of extraordinary length, installed inside HDD boreholes. As part of the Warsaw Subway Line No. 2 project, two twin TBM tunnels were required to cross under historical buildings. In order to mitigate the risk of settlements, a preliminary soil improvement was designed. Due to the particular layout of the buildings, an extreme solution was conceived, designed and applied. Starting from the surface, boreholes from 210-m to 260-m long were drilled by HDD technology. Each tunnel was fitted at its crown with 24 grouting pipes around the outside of the tunnel section to be bored. Grouting was performed by selective and repeated procedure, injecting first a high penetrability cement-based grout and then a silicate-based chemical mixture.
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Grouting 2017
Pages: 92 - 103
Copyright
© 2017 American Society of Civil Engineers.
History
Published online: Jul 6, 2017
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Authors
Affiliations
Geotecnical Engineer, via Volturno 23, I-21100 Varese, Italy; formerly, Icotekne S.p.A. E-mail: [email protected]
Underground Consulting s.a.s, via Certosa 1/i; I-27010 San Genesio ed Uniti (Pavia), Italy; formerly, Icotekne S.p.A. E-mail: [email protected]
Geotech Solutions s.a.s, via Genova 1, I-29022 Bobbio (PC), Italy; formerly, Icotekne S.p.A. E-mail: [email protected]
Geotech Solutions s.a.s, via Genova 1, I-29022 Bobbio (PC), Italy; formerly, Icotekne S.p.A. E-mail: [email protected]
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