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Analysis of surface waves from the light weight deflectometer

Rydén, Nils LU and Mooney, Michael A. (2009) In Soil Dynamics and Earthquake Engineering 29(7). p.1134-1142
Abstract
The combination of high strain modulus from conventional light weight deflectometer (LWD) analysis and low strain modulus front LWD-induced seismic analysis would move the pavement community towards field characterization of non-linear soil stiffness for use in mechanistic-empirical pavement design. This paper explores the experimental and numerical analysis of surface seismic waves during conventional light weight deflectometer testing. Field experiments were conducted on clay, silt and gravel soils to characterize the nature of LWD-induced surface waves and to determine both low and high strain moduli. The usable high frequency limit was found to be 300 Hz for LWD-induced surface waves, enabling the low strain modulus Characterization of... (More)
The combination of high strain modulus from conventional light weight deflectometer (LWD) analysis and low strain modulus front LWD-induced seismic analysis would move the pavement community towards field characterization of non-linear soil stiffness for use in mechanistic-empirical pavement design. This paper explores the experimental and numerical analysis of surface seismic waves during conventional light weight deflectometer testing. Field experiments were conducted on clay, silt and gravel soils to characterize the nature of LWD-induced surface waves and to determine both low and high strain moduli. The usable high frequency limit was found to be 300 Hz for LWD-induced surface waves, enabling the low strain modulus Characterization of the top 0.3-0.5-m-thick soil layer. A numerical investigation revealed that modal interference is a significant contributor to near field effects, and that a distance of one wavelength between the LWD center and receiver array center is required to minimize these effects. The LWD-induced surface wave strain levels at a 1 m offset from the LWD were found to be on the order of 10(-2) to 10(-3)% compared to the 10(-3) to 10(-4)% strain levels associated with conventional small hammer-induced surface waves. The measured low and high strain modulus compares well with published modulus reduction functions. (C) 2009 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Quality control, Soil dynamics, Soil compaction, Earthwork, Light weight deflectometer, Surface waves, Seismic measurements, Quality, assurance
in
Soil Dynamics and Earthquake Engineering
volume
29
issue
7
pages
1134 - 1142
publisher
Elsevier
external identifiers
  • wos:000266184100004
  • scopus:64549137034
ISSN
0267-7261
DOI
10.1016/j.soildyn.2009.01.002
language
English
LU publication?
yes
id
2b42acdd-6d99-4e36-af7c-44f8bf9e7e3e (old id 1425507)
date added to LUP
2009-07-01 15:24:49
date last changed
2017-10-22 03:47:57
@article{2b42acdd-6d99-4e36-af7c-44f8bf9e7e3e,
  abstract     = {The combination of high strain modulus from conventional light weight deflectometer (LWD) analysis and low strain modulus front LWD-induced seismic analysis would move the pavement community towards field characterization of non-linear soil stiffness for use in mechanistic-empirical pavement design. This paper explores the experimental and numerical analysis of surface seismic waves during conventional light weight deflectometer testing. Field experiments were conducted on clay, silt and gravel soils to characterize the nature of LWD-induced surface waves and to determine both low and high strain moduli. The usable high frequency limit was found to be 300 Hz for LWD-induced surface waves, enabling the low strain modulus Characterization of the top 0.3-0.5-m-thick soil layer. A numerical investigation revealed that modal interference is a significant contributor to near field effects, and that a distance of one wavelength between the LWD center and receiver array center is required to minimize these effects. The LWD-induced surface wave strain levels at a 1 m offset from the LWD were found to be on the order of 10(-2) to 10(-3)% compared to the 10(-3) to 10(-4)% strain levels associated with conventional small hammer-induced surface waves. The measured low and high strain modulus compares well with published modulus reduction functions. (C) 2009 Elsevier Ltd. All rights reserved.},
  author       = {Rydén, Nils and Mooney, Michael A.},
  issn         = {0267-7261},
  keyword      = {Quality control,Soil dynamics,Soil compaction,Earthwork,Light weight deflectometer,Surface waves,Seismic measurements,Quality,assurance},
  language     = {eng},
  number       = {7},
  pages        = {1134--1142},
  publisher    = {Elsevier},
  series       = {Soil Dynamics and Earthquake Engineering},
  title        = {Analysis of surface waves from the light weight deflectometer},
  url          = {http://dx.doi.org/10.1016/j.soildyn.2009.01.002},
  volume       = {29},
  year         = {2009},
}