Experiance from low-pH grouting at 400 m depth in the Äspö HRL expansion Project
2013 (English)Conference paper, Presentation (Refereed)
This paper presents experiences from the conducted grouting works regarding low-pH grout, grouting equipment, control and quality assurance which were acquired during the Äspö HRL expansion project. Companion papers describe the strategy for geoscientific investigations and modelling (Morosini and Hultgren, 2013) and the grouting strategy using the observational method (Olofsson et al., 2013a). Äspö HRL was expanded during 2012 in order to create new experimental sites as well as to develop and verify SKBs methods for tunnel construction. One of the objectives for the Äspö expansion project was to apply a full-scale industrialized test with low-pH grouting material. During complementary grouting in the fans intersecting water bearing fractures plastic plugs of grout were pushed out of the grouting boreholes due to hydraulic connections between holes and slow shear strength development in the low-pH grout. Grouting each fan in two steps and extended time for hardening during the excavation cycle proved to be the most efficient measures to handle the problems related to the slow hardening process of the low-pH grout.
Place, publisher, year, edition, pages
IdentifiersURN: urn:nbn:se:ltu:diva-37525Local ID: b96fd1db-9a84-4810-ab71-b2b6f59a9b3bOAI: oai:DiVA.org:ltu-37525DiVA: diva2:1011023
Nordic Grouting Symposium : 13/11/2013
Upprättat; 2013; 20160513 (henitt)2016-10-032016-10-03