Shear wave velocity profiles in offshore soils using the field velocity probe

Hyung Koo Yoon; Jong Sub Lee; Yong Kyu Choi

Shear wave velocity profiles in offshore soils using the field velocity probe

Hyung Koo Yoon, Jong Sub Lee, Yong Kyu Choi

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Shear wave velocity has been commonly used as one of the important design parameters for geotechnical structures which are subjected to dynamic loading. This paper introduces the development and application of a new apparatus, the Field Velocity Probe (FVP) for measurement of shear wave velocity in the field. The shape of the FVP is a blade with two frames, with transducers installed at the tip of the frames. The shear wave velocity is the ratio of the travel distance to the travel time of the shear waves. Thus, no inversion process is required. Penetration tests have been carried out to assess the applicability and disturbance effects in a calibration chamber. In calibration chamber tests, reconstituted clay is mixed with water using a slurry mixer to compose a model soil with a water content of 110 %. After consolidation of the reconstituted clay, FVP, downhole, and crosshole velocity tests are carried out at 1cm intervals during penetration of the penetrometers. The comparison tests produced similar shear wave velocity profiles for each of the apparatus. Shear wave velocity measurements in the field are measured every 10cm in clay soils up to 30 m by the FVP. The field tests show that the FVP produces a detailed shear wave velocity profile in clay. This study suggests that FVP may be an effective device for measuring the shear wave velocity with minimized disturbance in soft clay.

Original language	English
Title of host publication	The Proceedings of the 19th (2009) International OFFSHORE AND POLAR ENGINEERING CONFERENCE
Pages	197-201
Number of pages	5
Publication status	Published - 2009
Event	19th (2009) International OFFSHORE AND POLAR ENGINEERING CONFERENCE - Osaka, Japan Duration: 2009 Jun 21 → 2009 Jun 26

Publication series

Name	Proceedings of the International Offshore and Polar Engineering Conference
ISSN (Print)	1098-6189
ISSN (Electronic)	1555-1792

Other

Other	19th (2009) International OFFSHORE AND POLAR ENGINEERING CONFERENCE
Country/Territory	Japan
City	Osaka
Period	09/6/21 → 09/6/26

Keywords

Calibration chamber
Disturbance effect
Field velocity probe
In-situ test
Shear waves
Soft soils

ASJC Scopus subject areas

Energy Engineering and Power Technology
Ocean Engineering
Mechanical Engineering

Cite this

Shear wave velocity profiles in offshore soils using the field velocity probe. / Yoon, Hyung Koo; Lee, Jong Sub; Choi, Yong Kyu.
The Proceedings of the 19th (2009) International OFFSHORE AND POLAR ENGINEERING CONFERENCE. 2009. p. 197-201 (Proceedings of the International Offshore and Polar Engineering Conference).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Yoon, HK, Lee, JS & Choi, YK 2009, Shear wave velocity profiles in offshore soils using the field velocity probe. in The Proceedings of the 19th (2009) International OFFSHORE AND POLAR ENGINEERING CONFERENCE. Proceedings of the International Offshore and Polar Engineering Conference, pp. 197-201, 19th (2009) International OFFSHORE AND POLAR ENGINEERING CONFERENCE, Osaka, Japan, 09/6/21.

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AB - Shear wave velocity has been commonly used as one of the important design parameters for geotechnical structures which are subjected to dynamic loading. This paper introduces the development and application of a new apparatus, the Field Velocity Probe (FVP) for measurement of shear wave velocity in the field. The shape of the FVP is a blade with two frames, with transducers installed at the tip of the frames. The shear wave velocity is the ratio of the travel distance to the travel time of the shear waves. Thus, no inversion process is required. Penetration tests have been carried out to assess the applicability and disturbance effects in a calibration chamber. In calibration chamber tests, reconstituted clay is mixed with water using a slurry mixer to compose a model soil with a water content of 110 %. After consolidation of the reconstituted clay, FVP, downhole, and crosshole velocity tests are carried out at 1cm intervals during penetration of the penetrometers. The comparison tests produced similar shear wave velocity profiles for each of the apparatus. Shear wave velocity measurements in the field are measured every 10cm in clay soils up to 30 m by the FVP. The field tests show that the FVP produces a detailed shear wave velocity profile in clay. This study suggests that FVP may be an effective device for measuring the shear wave velocity with minimized disturbance in soft clay.

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Shear wave velocity profiles in offshore soils using the field velocity probe

Abstract

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Keywords

ASJC Scopus subject areas

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