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Probabilistic stability analysis of embankments founded on clay
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. , xviii, 74 p.
Series
Trita-JOB PHD, ISSN 1650-9501 ; 1018
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:kth:diva-122886OAI: oai:DiVA.org:kth-122886DiVA: diva2:623900
Public defence
2013-06-04, Sal B1, Brinellvägen 23, Brinellvägen 23, KTH, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

QC 20130529

Available from: 2013-05-29 Created: 2013-05-29 Last updated: 2013-05-29Bibliographically approved
List of papers
1. Hydraulic Conductivity and Coefficient of Consolidation of Two Sulphide Clays in Sweden
Open this publication in new window or tab >>Hydraulic Conductivity and Coefficient of Consolidation of Two Sulphide Clays in Sweden
2012 (English)In: Geotechnical and Geological Engineering, ISSN 0960-3182, E-ISSN 1573-1529, Vol. 30, no 1, 173-186 p.Article in journal (Refereed) Published
Abstract [en]

The variation and anisotropy in hydraulic conductivity and the coefficient of consolidation was investigated for two Swedish sulphide clays. A series of constant rate of strain oedometer tests was performed on samples trimmed in the vertical and horizontal direction. A methodology to evaluate the horizontal coefficients of consolidation c h via the horizontal hydraulic conductivity k h and the vertical compression modulus M v is proposed. Laboratory evaluations of c h are also compared with determinations of c h from in situ piezometer measurements in vertically drained sulphide clay. Furthermore, the validity of the empirical correlation between hydraulic conductivity change index C k and initial void ratio e 0, C k = 0.5e 0 (Tavenas et al. in Can Geotech J 20(4):645-660, 1983b), was investigated for the sulphide clays. The results from the investigation show large ranges in measured hydraulic conductivities and coefficients of consolidation. However, the results indicate that the correlation C k = 0.5e 0 is valid. The anisotropy in hydraulic conductivity and the coefficient of consolidation of the sulphide clays tested seems to be small. For design purposes, multiple tests for assessment of hydraulic conductivity and the coefficient of consolidation should be made, and a partial factor of safety, depending on the requisite level of safety and the spatial variability of the parameters, should be introduced. For design purposes in this type of clay, k h = k v and c h = c v are suggested.

Place, publisher, year, edition, pages
Springer, 2012
Keyword
Anisotropy, Coefficient of consolidation, CRS test, Hydraulic conductivity, Prefabricated vertical drain, Sulphide clay
National Category
Geotechnical Engineering
Identifiers
urn:nbn:se:kth:diva-25823 (URN)10.1007/s10706-011-9459-0 (DOI)2-s2.0-84155180932 (Scopus ID)
Note
QC 20120618Available from: 2010-11-01 Created: 2010-11-01 Last updated: 2017-12-12Bibliographically approved
2. Stability for a high embankment founded on sulphide clay
Open this publication in new window or tab >>Stability for a high embankment founded on sulphide clay
2013 (English)In: Proceedings of the Institution of Civil Engeneers: Geotechnical Engineering, ISSN 1353-2618, E-ISSN 1751-8563, Vol. 166, no 1, 31-48 p.Article in journal (Refereed) Published
Abstract [en]

During staged construction of embankments on clay foundations, the undrained shear strength s(u) increases due to consolidation during the construction process. The increase is usually related to the pre-consolidation pressure sigma'(p) by way of the ratio s(u)/sigma'(p) and is important when assessing the stability of an embankment. Properties controlling the increase are usually associated with various unknowns that can be difficult to predict before construction. A case involving a large embankment built on vertically drained sulfide clay is presented. Empirical knowledge and experience of similar constructions on sulfide clay were limited, therefore there were uncertainties of the soil-drain interaction and how the soil would behave under the embankment load. A trial embankment was built to gather knowledge and experience of this particular soil and the observational method was adopted. The study presents how embankment stability was predicted at design stage and controlled during construction. It highlights the importance and usefulness of obtaining measurement data from different types of measurements. Laboratory tests and a large number of in situ tests at different stages during construction were performed to assess s(u)/sigma'(p) ratios in the sulfide clay. The mean s(u)/sigma'(p) ratio was estimated by means of statistical analysis to 0.25 for a large stress interval.

Keyword
embankments, field testing & monitoring, geotechnical engineering
National Category
Civil Engineering Geotechnical Engineering
Identifiers
urn:nbn:se:kth:diva-25824 (URN)10.1680/geng.9.00080 (DOI)000313738500005 ()2-s2.0-84878074873 (Scopus ID)
Note

QC 20130213

Available from: 2010-11-01 Created: 2010-11-01 Last updated: 2017-12-12Bibliographically approved
3. Extended multivariate approach for uncertainty reduction in the assessment of undrained shear strength in clays
Open this publication in new window or tab >>Extended multivariate approach for uncertainty reduction in the assessment of undrained shear strength in clays
2014 (English)In: Canadian geotechnical journal (Print), ISSN 0008-3674, E-ISSN 1208-6010, Vol. 51, no 3, 231-245 p.Article in journal (Refereed) Published
Abstract [en]

Important features of the multivariate approach are discussed, and an extension to this approach is proposed whereby the total uncertainty in site investigation methods due to spatial averaging is assessed prior to its adoption. Results from a site investigation of spatially averaged values of undrained shear strength (S-u) and the corresponding coefficient of variation (COVSu) in Veda sulphide clay were used as a practical illustration of the extended multivariate approach and provide a basis for discussion. The inherent variability and scales of fluctuation for different methods are presented. The study shows the usefulness of the extended multivariate approach for the evaluation of representative values of S-u and COVSu based on results from different methods. It is also a way of implicitly reducing the transformation errors that arise when a property is derived from measurement results. Nevertheless, considerable care must be taken as a much lower COV for one method will have a significant impact on the results.

Keyword
sulphide clay, undrained shear strength, embankments, statistical analysis, uncertainty, multivariate approach
National Category
Geotechnical Engineering
Identifiers
urn:nbn:se:kth:diva-122884 (URN)10.1139/cgj-2012-0176 (DOI)000332536500001 ()2-s2.0-84895521715 (Scopus ID)
Note

QC 20140422

Available from: 2013-05-29 Created: 2013-05-29 Last updated: 2017-12-06Bibliographically approved
4. Multivariate stability assessment during staged construction
Open this publication in new window or tab >>Multivariate stability assessment during staged construction
2016 (English)In: Canadian geotechnical journal (Print), ISSN 0008-3674, E-ISSN 1208-6010, Vol. 53, no 4, 603-618 p.Article in journal (Refereed) Published
Abstract [en]

For staging the construction of embankments on soft clay, an important aspect in deterministic or probabilistic stability analyses is the assessment of the representative average values and associated uncertainties for the undrained shear strength as the height of the embankment is sequentially increased. Assessments made prior to construction can be verified by performing observations during the construction phase. All relevant available information should be incorporated into an analysis to increase the level of confidence and the objectivity of the assessment. To this end, we apply an extended multivariate approach to assess the undrained shear strength using different indirect measurement methods during the staged construction of the Veda embankment (Sweden). This multivariate approach implies that uncertainties associated with the assessments are reduced, and objectively weighted averages are obtained. The resulting implications on the calculated deterministic safety factors and the probabilistically retrieved reliability indices of the embankment are thoroughly discussed in this work.

National Category
Geotechnical Engineering
Identifiers
urn:nbn:se:kth:diva-122885 (URN)10.1139/cgj-2015-0037 (DOI)000375936300004 ()2-s2.0-84962030390 (Scopus ID)
Note

QC 20160516

Available from: 2013-05-29 Created: 2013-05-29 Last updated: 2017-12-06Bibliographically approved
5. Aspects on the modelling of smear zones around vertical drains
Open this publication in new window or tab >>Aspects on the modelling of smear zones around vertical drains
2013 (English)In: Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris 2013, 2013, 2965-2968 p.Conference paper, Published paper (Refereed)
Abstract [en]

The analytical design of vertical drains in soft clay requires knowledge of the coefficient of consolidation and also of the disturbance effects induced during the installation of the drains. Several analytical models describing the disturbance effects in different ways are proposed in the literature. The earliest and simplest models describe the disturbance effect in terms of concentric cylinders around a drain where a reduced and constant permeability is assumed, while more recent models attempt to describe the disturbance more realistically via more complex mathematical formulations. Although these new models describe the real in situ behaviour more realistically than the early ones, they may not always be suitable for practical use as many of the required variables are difficult to assess by standard investigation methods. This study investigates and discusses the difference between some of the available models and evaluates the influences on the results of the variables incorporated in the models.

Keyword
Vertical Drains, Design, Modelling
National Category
Geotechnical Engineering
Identifiers
urn:nbn:se:kth:diva-122889 (URN)
Conference
International Conference on Soil Mechanics and Geotechnical Engineering, Paris, 2-6 September 2013
Note

QC 20140626

Available from: 2013-05-29 Created: 2013-05-29 Last updated: 2014-06-26Bibliographically approved

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