Cyclic CPT Measurements of Disturbed Soil State

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskningpeer review

Resumé

Disturbed soil states in geotechnical problems occurs together with large uncertainties. During earthquake, disturbed sand can become either more or less resistant to liquefaction. Due to the cyclic loading, offshore wind turbine foundations can episodically loose or recover the stiffness. In both cases, the initial in-situ soil state is lost, as disturbed soil state evolves during cyclic loading. Thus, it is important to develop a testing procedure that combines observations of both the initial condition and the long-term disturbed soil state.
This paper presents the results of cone penetration tests (CPT-s). A conventional use of CPT leads to undisturbed soil results. However, the paper describe a non-conventional use of this method, where CPT is performed multiple times in the same location. The first penetration measures the undisturbed sand strength and stiffness, whereas the second and later penetrations observe evolving disturbed state of sand. The ‘cyclic CPT’ curve of cone resistance qc converges while repeating the test, resulting in a final disturbed soil profile for initial sand state.
OriginalsprogEngelsk
Titel7th International Symposium on Geotechnical Safety and Risk (ISGSR 2019)
StatusAccepteret/In press - 28 jan. 2019
Begivenhed7th International Symposium on Geotechnical Safety and Risk - National Taiwan University of Science and Technology, Taipei, Taiwan
Varighed: 11 dec. 201913 dec. 2019
Konferencens nummer: 7
http://www.isgsr2019.org/

Konference

Konference7th International Symposium on Geotechnical Safety and Risk
Nummer7
LokationNational Taiwan University of Science and Technology
LandTaiwan
ByTaipei
Periode11/12/201913/12/2019
Internetadresse

Fingerprint

Soils
Sand
Cones
Stiffness
Offshore wind turbines
Liquefaction
Earthquakes
Testing

Citer dette

Koteras, A. K., Sabaliauskas, T., & Ibsen, L. B. (Accepteret/In press). Cyclic CPT Measurements of Disturbed Soil State. I 7th International Symposium on Geotechnical Safety and Risk (ISGSR 2019)
Koteras, Aleksandra Katarzyna ; Sabaliauskas, Tomas ; Ibsen, Lars Bo. / Cyclic CPT Measurements of Disturbed Soil State. 7th International Symposium on Geotechnical Safety and Risk (ISGSR 2019). 2019.
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title = "Cyclic CPT Measurements of Disturbed Soil State",
abstract = "Disturbed soil states in geotechnical problems occurs together with large uncertainties. During earthquake, disturbed sand can become either more or less resistant to liquefaction. Due to the cyclic loading, offshore wind turbine foundations can episodically loose or recover the stiffness. In both cases, the initial in-situ soil state is lost, as disturbed soil state evolves during cyclic loading. Thus, it is important to develop a testing procedure that combines observations of both the initial condition and the long-term disturbed soil state. This paper presents the results of cone penetration tests (CPT-s). A conventional use of CPT leads to undisturbed soil results. However, the paper describe a non-conventional use of this method, where CPT is performed multiple times in the same location. The first penetration measures the undisturbed sand strength and stiffness, whereas the second and later penetrations observe evolving disturbed state of sand. The ‘cyclic CPT’ curve of cone resistance qc converges while repeating the test, resulting in a final disturbed soil profile for initial sand state.",
keywords = "Sand, Disturbed Soil, CPT, Cyclic Behaviour",
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Koteras, AK, Sabaliauskas, T & Ibsen, LB 2019, Cyclic CPT Measurements of Disturbed Soil State. i 7th International Symposium on Geotechnical Safety and Risk (ISGSR 2019). 7th International Symposium on Geotechnical Safety and Risk, Taipei, Taiwan, 11/12/2019.

Cyclic CPT Measurements of Disturbed Soil State. / Koteras, Aleksandra Katarzyna; Sabaliauskas, Tomas; Ibsen, Lars Bo.

7th International Symposium on Geotechnical Safety and Risk (ISGSR 2019). 2019.

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskningpeer review

TY - GEN

T1 - Cyclic CPT Measurements of Disturbed Soil State

AU - Koteras, Aleksandra Katarzyna

AU - Sabaliauskas, Tomas

AU - Ibsen, Lars Bo

PY - 2019/1/28

Y1 - 2019/1/28

N2 - Disturbed soil states in geotechnical problems occurs together with large uncertainties. During earthquake, disturbed sand can become either more or less resistant to liquefaction. Due to the cyclic loading, offshore wind turbine foundations can episodically loose or recover the stiffness. In both cases, the initial in-situ soil state is lost, as disturbed soil state evolves during cyclic loading. Thus, it is important to develop a testing procedure that combines observations of both the initial condition and the long-term disturbed soil state. This paper presents the results of cone penetration tests (CPT-s). A conventional use of CPT leads to undisturbed soil results. However, the paper describe a non-conventional use of this method, where CPT is performed multiple times in the same location. The first penetration measures the undisturbed sand strength and stiffness, whereas the second and later penetrations observe evolving disturbed state of sand. The ‘cyclic CPT’ curve of cone resistance qc converges while repeating the test, resulting in a final disturbed soil profile for initial sand state.

AB - Disturbed soil states in geotechnical problems occurs together with large uncertainties. During earthquake, disturbed sand can become either more or less resistant to liquefaction. Due to the cyclic loading, offshore wind turbine foundations can episodically loose or recover the stiffness. In both cases, the initial in-situ soil state is lost, as disturbed soil state evolves during cyclic loading. Thus, it is important to develop a testing procedure that combines observations of both the initial condition and the long-term disturbed soil state. This paper presents the results of cone penetration tests (CPT-s). A conventional use of CPT leads to undisturbed soil results. However, the paper describe a non-conventional use of this method, where CPT is performed multiple times in the same location. The first penetration measures the undisturbed sand strength and stiffness, whereas the second and later penetrations observe evolving disturbed state of sand. The ‘cyclic CPT’ curve of cone resistance qc converges while repeating the test, resulting in a final disturbed soil profile for initial sand state.

KW - Sand

KW - Disturbed Soil

KW - CPT

KW - Cyclic Behaviour

M3 - Article in proceeding

BT - 7th International Symposium on Geotechnical Safety and Risk (ISGSR 2019)

ER -

Koteras AK, Sabaliauskas T, Ibsen LB. Cyclic CPT Measurements of Disturbed Soil State. I 7th International Symposium on Geotechnical Safety and Risk (ISGSR 2019). 2019