Chapter
Jul 6, 2017
Statistical Evaluation of Groutability Using Data from Hydraulic Tests and Fracture Mapping Case Studies from Sweden
Authors: Edward Runslätt [email protected], Johan Thörn, Ph.D. [email protected], Åsa Fransson [email protected], and Sara Kvartsberg [email protected]Author Affiliations
Publication: Grouting 2017
Abstract
Sweden has a long history of research within the field of rock fissure grouting in hard crystalline rock mass due to strict environmental requirements regarding allowable ground water draw down. These requirements normally implies that fractures down to aperture size between 50 to 100 µm needs to be sealed and within these ranges the size of the particles for cementitious grouting agents becomes a limiting factor. For a grouting design it is therefore of importance to consider the aperture size distribution of the rock mass in order to predict the groutability for both cementitious and non-cementitious grouting agents. Transmissivity data from hydraulic tests (water pressure tests) and number of fractures along a borehole can be assessed from core logging for further use as input for a statistical interpretation of fracture data to simulate an aperture size distribution. A methodology developed at Chalmers University of Technology in Gothenburg, Sweden, is proposed. The method is a statistical evaluation of groutability (SEG) and is based on the Pareto distribution. A computational design tool has been developed to simplify the use of the statistical evaluation and to make the research more accessible to end users, designers, in the grouting industry. The aim of this article is to present two case studies where the statistical interpretation of fracture data is performed by using the computational design tool and how the outcome can be of great use in finding a more accurate grouting design. The case studies include fracture data sets from two large infrastructure rock tunnel projects in Sweden; a road tunnel in Stockholm and a railroad tunnel in Gothenburg.
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© 2017 American Society of Civil Engineers.
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Published online: Jul 6, 2017
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Golder Associates AB, Division of Geotechnical Engineering, Stockholm, Sweden. E-mail: [email protected]
Chalmers Univ. of Technology, Division of GeoEngineering, Gothenburg, Sweden; Bergab, Gothenburg. E-mail: [email protected]
Professor, Chalmers Univ. of Technology, Division of GeoEngineering, Gothenburg, Sweden; Golder Associates AB, Gothenburg, Sweden. E-mail: [email protected]
Norconsult AB, Division of Rock and Hydrogeology, Gothenburg, Sweden. E-mail: [email protected]
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