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Characterization of strenght vaiability for reliability-based design of lime-cement columns
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. , xii, 29 p.
Series
TRITA-JOB. LIC, ISSN 1650-951X ; 2017
Keyword [en]
geotechnical engineering, deep mixing, strength variability
National Category
Civil Engineering Geotechnical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-98816OAI: oai:DiVA.org:kth-98816DiVA: diva2:539176
Presentation
2012-06-05, B1, KTH, Brinellvägen 23, Stockholm, 13:00
Opponent
Supervisors
Note

QC 20120703

Available from: 2012-07-03 Created: 2012-07-03 Last updated: 2014-06-18Bibliographically approved
List of papers
1. Strength variability in lime-cement columns based on CPT data
Open this publication in new window or tab >>Strength variability in lime-cement columns based on CPT data
2012 (English)In: Ground Improvement, ISSN 1365-781X, E-ISSN 1751-7621, Vol. 165, no 1, 15--30 p.Article in journal (Refereed) Published
Abstract [en]

Natural and improved soils have relatively high inherent property variability that should be taken into consideration in design. Investigations of the spatial variability in lime-cement columns are important since they provide a rational quantification of the variability parameters needed for a reliability-based design analysis of geotechnical systems. Statistical analyses are used to evaluate the spatial variability parameters, i.e. the mean, the variance, and the scale of fluctuation, which is the distance within which soil properties reveal strong correlation. This paper presents a field test, in which 30 CPT soundings were performed and analyzed statistically in order to address the spatial variability in a group of lime-cement columns, with respect to the cone tip resistance. The objective of this paper is to describe the statistical analyses and to make a contribution to the empirical knowledge about strength variability in a volume of lime-cement columns. Stationarity has been assessed, and the scale of fluctuation has been evaluated in the vertical and horizontal directions. Random field theory was used based on the sample autocorrelation function ACF. The scale of fluctuation was found to be within the range of 0.2-0.7 m and 2-3 m in the vertical and horizontal direction, respectively. A simple design consideration shows that the variance reduction factor has a major influence on the determination of the design value.

Keyword
ground improvement, deep mixing, lime-cement columns, statistical analyses, spatial variability, cone penetration test
National Category
Civil Engineering Geotechnical Engineering
Identifiers
urn:nbn:se:kth:diva-59086 (URN)10.1680/grim.2012.165.1.15 (DOI)2-s2.0-84858857990 (Scopus ID)
Note

QC 20150622

Available from: 2012-01-10 Created: 2012-01-10 Last updated: 2017-12-08Bibliographically approved
2. Variability of strength and deformation properties in lime-cement columns evaluated from CPT and KPS measurements
Open this publication in new window or tab >>Variability of strength and deformation properties in lime-cement columns evaluated from CPT and KPS measurements
2013 (English)In: Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards, ISSN 1749-9518, E-ISSN 1749-9526, Vol. 7, no 1, 21-36 p.Article in journal (Refereed) Published
Abstract [en]

The strength variability of soil improved by deep mixing with lime-cement columns is generally high. Eurocode 7 states that selection of characteristic values for geotechnical parameters shall take the variability of measured property values into account. This variability can be considered in the design by using reliability-based design. With reliability-based design, three statistical parameters are needed to evaluate the design value; mean, variance and scale of fluctuation. In this paper, the shear strength of soil improved by lime-cement columns was evaluated using two different penetration methods, the cone penetration test and the column penetration test. The strength was quantified statistically by the mean, variance and scale of fluctuation, while each test method was analyzed and discussed with a focus on its influence on the design value. Based on the analyses, the column penetration test is suggested as a test method for soil improved by lime-cement columns.

Keyword
ground improvement, deep mixing, lime-cement columns, CPT, column penetration test
National Category
Civil Engineering Geotechnical Engineering
Identifiers
urn:nbn:se:kth:diva-59088 (URN)10.1080/17499518.2013.763571 (DOI)2-s2.0-84874191684 (Scopus ID)
Note

QC 20140618. Tidigare titel: "Strength variability in lime-cement columns evaluated using CPT and KPS"

Available from: 2012-01-10 Created: 2012-01-10 Last updated: 2017-12-08Bibliographically approved
3. Comparing column penetration and total–sounding data for lime–cement columns
Open this publication in new window or tab >>Comparing column penetration and total–sounding data for lime–cement columns
2014 (English)In: Ground Improvement, ISSN 1365-781X, E-ISSN 1751-7621, Vol. 167, no 4, 249-259 p.Article in journal (Refereed) Published
Abstract [en]

In Sweden, the method commonly used for the quality control of lime–cement columns is the column penetration test. However, it is recommended for depths of no more than 8 m because the probe easily deviates from the column at greater depths. As an alternative to facilitate keeping the probe vertical, a centre hole is normally bored in the column using the total-sounding test method. The aim of this paper is to quantify the agreement between the two methods. If there is good agreement, it should be possible to use the less expensive and less time-consuming total-sounding test as a complement to the column penetration test. The analyses suggest good agreement between the methods, and it is therefore suggested that the total-sounding test be used as a complement to the column penetration test in evaluating the average strength properties of a group of medium- and high-strength lime–cement columns.

Place, publisher, year, edition, pages
Thomas Telford, 2014
Keyword
ground improvement, deep mixing, correlation, agreement, column penetration test, total-sounding test, rotary penetration test
National Category
Civil Engineering Geotechnical Engineering
Identifiers
urn:nbn:se:kth:diva-98814 (URN)10.1680/grim.12.00019 (DOI)2-s2.0-84912092226 (Scopus ID)
Note

QC 20150622

Available from: 2012-07-03 Created: 2012-07-03 Last updated: 2017-12-07Bibliographically approved

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