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AN EXPERIMENTAL STUDY OF THE INFLUENCE OF DYNAMIC PRESSURE ON IMPROVING GROUT PENETRABILITY
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.ORCID iD: 0000-0002-5394-3868
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.ORCID iD: 0000-0001-9615-4861
2015 (English)Report (Other academic)Alternative title
Effekten av varierande tryck på inträngningsförmågan hos injekteringsbruk. En experimentell studie (Swedish)
Abstract [en]

In order to increase the sealing efficiency in rock grouting, the fractures should be entirely grouted while the filtration of cement particles is an obstacle. By reducing the filtration, penetrability of grout will be increased resulting in a more reliable grouting. Some of the advantages of controlling filtration are decreas in time, costs and the environmental impacts of the projects. Increase in the safety margins of the projects during both the construction and the operation are also among the benefits of regulating the filtration.

Use of variable pressure for improving grout penetrability has been studied in both the lab and the field over the years. The focus of the previous investigations was mainly on application of high frequency oscillating pressure using artificial parallel plates without constrictions with openning sizes larger than 100 μm. The mechanism of improvement of grout penetrability was interpreted as reduction in viscosity due to the oscillation in all those studies. The missing parts of the resulted knowledge are the influences of different shapes of the variable pressure and the effects of low frequencies i.e. longer cycle periods to penetrate through micro fractures smaller than 100 μm with constrictions. Moreover, other mechanisms of improvement of grout penetrability might also be more efficient than reduction in viscosity due to the oscillation.

The focus of this study is therefore to investigat the influence of low frequency instantaneous variable pressure with different peak and rest periods on regulating the filtration. A pneumatic pressure control system has been thus employed using parallel plates with constrictions of 43 and 30 μm. The proposed mechanism of action was change of flow pattern due to the change in pressure and the corresponding velocity. Comparison of results of the variable and the constant pressures revealed the great impact of the examined variable pressure on improving grout penetrability.

Place, publisher, year, edition, pages
Stockholm, 2015. , p. 96
Series
BeFo Report ; 149
Keyword [en]
Penetrability, filtration, erosion, cement-based grout, variable/dynamic grouting
National Category
Geotechnical Engineering
Research subject
Civil and Architectural Engineering
Identifiers
URN: urn:nbn:se:kth:diva-217904ISRN: BEFO-R-149-SEOAI: oai:DiVA.org:kth-217904DiVA, id: diva2:1158290
Funder
Rock Engineering Research Foundation (BeFo)
Note

QC 20171218

Available from: 2017-11-19 Created: 2017-11-19 Last updated: 2017-12-18Bibliographically approved

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