Assessment of using liquidity index for the approximation of undrained shear strength of clay tills in Scania
(2019) In Dissertations in Geology at Lund University GEOR02 20172Department of Geology
- Abstract
- Undrained shear strength is a crucial parameter of the clay-rich sediments commonly used in the design process of geotechnical structures and is determined by several tests. As a considerable part of these tests are cost- and time consuming, it is of interest to investigate the potential relationship with shear strength (cu) with alternative, easily measurable parameters, such as liquidity index (IL). In this study, several field and laboratory methods were applied to collect samples, analyse physical properties, and determine undrained shear strength of three clay tills of Stångby and Simrishamn in the province of Scania in southern Sweden. In total, 23 disturbed samplings, 13 cone penetration tests (CPT), and 11 vane shear tests (VST)... (More)
- Undrained shear strength is a crucial parameter of the clay-rich sediments commonly used in the design process of geotechnical structures and is determined by several tests. As a considerable part of these tests are cost- and time consuming, it is of interest to investigate the potential relationship with shear strength (cu) with alternative, easily measurable parameters, such as liquidity index (IL). In this study, several field and laboratory methods were applied to collect samples, analyse physical properties, and determine undrained shear strength of three clay tills of Stångby and Simrishamn in the province of Scania in southern Sweden. In total, 23 disturbed samplings, 13 cone penetration tests (CPT), and 11 vane shear tests (VST) were performed. The natural water content and liquid and plastic limits were established from all disturbed samples and undrained shear strength was determined from CPT and VST. The results show that the liquidity index varies between -0.10 and 0.34 at Stångby and between -0.35 and 0.23 at Simrishamn. The undrained shear strength varies between 57 and 256 kPa at Stångby and between 179 and 763 kPa at Simrishamn. Only a partial relationship between the liquidity index and undrained shear strength was found in this study. The study shows that the wide range of the consistency of clay-rich sediments is crucial for the correlation between IL and cu, which was demonstrated by the relation being found only at Simrishamn. (Less)
- Abstract (Swedish)
- Den odränerade skjuvhållfastheten är en viktig geoteknisk parameter som man behöver ha en god uppfattning om i samband med byggnation på lerrika jordarter. Då flertalet av de vanligen tillämpade undersökningsmetoderna är väldigt tidskrävande och kostsamma, finns det ett stort intresse för att undersöka hur alternativa och samtidigt mer enkelt mätbara parametrar, så som flytindex (IL), förhåller sig till skjuvhållfastheten (cu). I denna studie användes flera olika typer av laboratorietester och fältmetoder för att analysera fysikaliska egenskaper hos tre olika moränleror från Stångby och Simrishamn och därmed bestämma den odränerade skjuvhållfastheten hos dessa. Totalt togs 23 störda prover och på samma djup utfördes 13... (More)
- Den odränerade skjuvhållfastheten är en viktig geoteknisk parameter som man behöver ha en god uppfattning om i samband med byggnation på lerrika jordarter. Då flertalet av de vanligen tillämpade undersökningsmetoderna är väldigt tidskrävande och kostsamma, finns det ett stort intresse för att undersöka hur alternativa och samtidigt mer enkelt mätbara parametrar, så som flytindex (IL), förhåller sig till skjuvhållfastheten (cu). I denna studie användes flera olika typer av laboratorietester och fältmetoder för att analysera fysikaliska egenskaper hos tre olika moränleror från Stångby och Simrishamn och därmed bestämma den odränerade skjuvhållfastheten hos dessa. Totalt togs 23 störda prover och på samma djup utfördes 13 spetstrycksonderingar (CPT) och 11 vingförsök (VST). Den naturliga vattenkvoten, flytgränsen och plasticitetsgränsen fastställdes på alla störda prover medan den odränerade skjuvhållfastheten bestämdes med hjälp av CPT och VST. Resultaten visar att flytindex varierar mellan -0.10 och 0.34 i Stångby och mellan -0.35 och 0.23 i Simrishamn. Den odränerade skjuvhållfastheten varierar mellan 57 och 256 kPa i Stångby och mellan 179 och 763 kPa i Simrishamn. Endast en partiell relation kunde fastslås mellan flytindex och odränerad skjuvhållfasthet, och tydligast samband kunde påvisas på proverna från Simrishamn. Studien visar att det krävs analys av en stor mängd prover med mycket stor skillnad i konsistens för att fastslå sambandet mellan flytindex och odränerad skjuvhållfasthet. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/8971549
- author
- Andreasson, Dagnija LU
- supervisor
-
- Dan Hammarlund LU
- Erika Tudisco LU
- organization
- course
- GEOR02 20172
- year
- 2019
- type
- H2 - Master's Degree (Two Years)
- subject
- keywords
- clay till, undrained shear strength, liquidity index, CPT
- publication/series
- Dissertations in Geology at Lund University
- report number
- 550
- language
- English
- id
- 8971549
- date added to LUP
- 2019-02-22 11:34:34
- date last changed
- 2019-02-22 11:34:34
@misc{8971549,
abstract = {{Undrained shear strength is a crucial parameter of the clay-rich sediments commonly used in the design process of geotechnical structures and is determined by several tests. As a considerable part of these tests are cost- and time consuming, it is of interest to investigate the potential relationship with shear strength (cu) with alternative, easily measurable parameters, such as liquidity index (IL). In this study, several field and laboratory methods were applied to collect samples, analyse physical properties, and determine undrained shear strength of three clay tills of Stångby and Simrishamn in the province of Scania in southern Sweden. In total, 23 disturbed samplings, 13 cone penetration tests (CPT), and 11 vane shear tests (VST) were performed. The natural water content and liquid and plastic limits were established from all disturbed samples and undrained shear strength was determined from CPT and VST. The results show that the liquidity index varies between -0.10 and 0.34 at Stångby and between -0.35 and 0.23 at Simrishamn. The undrained shear strength varies between 57 and 256 kPa at Stångby and between 179 and 763 kPa at Simrishamn. Only a partial relationship between the liquidity index and undrained shear strength was found in this study. The study shows that the wide range of the consistency of clay-rich sediments is crucial for the correlation between IL and cu, which was demonstrated by the relation being found only at Simrishamn.}},
author = {{Andreasson, Dagnija}},
language = {{eng}},
note = {{Student Paper}},
series = {{Dissertations in Geology at Lund University}},
title = {{Assessment of using liquidity index for the approximation of undrained shear strength of clay tills in Scania}},
year = {{2019}},
}