Needle probe application for high-resolution assessment of soil spatial variability in the centrifuge

Zhihua Li, Bruce L. Kutter, Daniel W. Wilson, Kenneth Sprott, Jong-Sub Lee, J. Carlos Santamarina

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

This paper addresses the development of an electrical resistivity needle probe to be deployed during centrifuge model testing to assess with high-resolution the spatial variability of soil electrical resistivity. The probe is able to detect thin layers and accurately resolve interfaces between soil layers. The prototype probes are made from thin, stainless steel needles, with an insulated wire inserted into the needle, and bonded to it with epoxy resin, to form a coaxial probe (Cho et al. 2004). Different tip shapes including single-wedge, double-wedge and cone have been developed to optimize the spatial resolution of porosity, soil interfaces and layering. The calibration and testing of the needle probe has been conducted both at Georgia Tech and UC Davis. This paper presents results of resistance versus depth and porosity versus depth, and compares the porosity based on measurement of mass and volume with the calculated porosity based on the needle probe measurements. Consequently, insertion effects are discussed and theoretical explanations are given. For its deployment in the centrifuge, a special needle probe tool has been developed to be operated by the new NEES robot. Instrumentation, data acquisition and data processing issues associated with the needle probe robot tool are discussed. The basis for selection of materials, probe tip geometry, and the optimum frequency of AC electrical measurements is explained.

Original languageEnglish
Title of host publicationGeotechnical Special Publication
Pages2087-2101
Number of pages15
Edition130-142
Publication statusPublished - 2005
Externally publishedYes
EventGeo-Frontiers 2005 - Austin, TX, United States
Duration: 2005 Jan 242005 Jan 26

Other

OtherGeo-Frontiers 2005
CountryUnited States
CityAustin, TX
Period05/1/2405/1/26

Fingerprint

centrifuges
Centrifuges
centrifuge
Needles
probes (equipment)
probe
Soils
soil
porosity
Porosity
electrical resistance
robots
electrical resistivity
Insulated wire
Robots
soil heterogeneity
Testing
instrumentation
stainless steel
wire

Keywords

  • Centrifuge
  • Needle probe
  • NEES
  • Porosity
  • Resolution
  • Robot
  • Spatial variability

ASJC Scopus subject areas

  • Building and Construction
  • Architecture
  • Soil Science

Cite this

Li, Z., Kutter, B. L., Wilson, D. W., Sprott, K., Lee, J-S., & Santamarina, J. C. (2005). Needle probe application for high-resolution assessment of soil spatial variability in the centrifuge. In Geotechnical Special Publication (130-142 ed., pp. 2087-2101)

Needle probe application for high-resolution assessment of soil spatial variability in the centrifuge. / Li, Zhihua; Kutter, Bruce L.; Wilson, Daniel W.; Sprott, Kenneth; Lee, Jong-Sub; Santamarina, J. Carlos.

Geotechnical Special Publication. 130-142. ed. 2005. p. 2087-2101.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Li, Z, Kutter, BL, Wilson, DW, Sprott, K, Lee, J-S & Santamarina, JC 2005, Needle probe application for high-resolution assessment of soil spatial variability in the centrifuge. in Geotechnical Special Publication. 130-142 edn, pp. 2087-2101, Geo-Frontiers 2005, Austin, TX, United States, 05/1/24.
Li Z, Kutter BL, Wilson DW, Sprott K, Lee J-S, Santamarina JC. Needle probe application for high-resolution assessment of soil spatial variability in the centrifuge. In Geotechnical Special Publication. 130-142 ed. 2005. p. 2087-2101
Li, Zhihua ; Kutter, Bruce L. ; Wilson, Daniel W. ; Sprott, Kenneth ; Lee, Jong-Sub ; Santamarina, J. Carlos. / Needle probe application for high-resolution assessment of soil spatial variability in the centrifuge. Geotechnical Special Publication. 130-142. ed. 2005. pp. 2087-2101
@inproceedings{294a2451bc3d4b9dabd399ab8df90db3,
title = "Needle probe application for high-resolution assessment of soil spatial variability in the centrifuge",
abstract = "This paper addresses the development of an electrical resistivity needle probe to be deployed during centrifuge model testing to assess with high-resolution the spatial variability of soil electrical resistivity. The probe is able to detect thin layers and accurately resolve interfaces between soil layers. The prototype probes are made from thin, stainless steel needles, with an insulated wire inserted into the needle, and bonded to it with epoxy resin, to form a coaxial probe (Cho et al. 2004). Different tip shapes including single-wedge, double-wedge and cone have been developed to optimize the spatial resolution of porosity, soil interfaces and layering. The calibration and testing of the needle probe has been conducted both at Georgia Tech and UC Davis. This paper presents results of resistance versus depth and porosity versus depth, and compares the porosity based on measurement of mass and volume with the calculated porosity based on the needle probe measurements. Consequently, insertion effects are discussed and theoretical explanations are given. For its deployment in the centrifuge, a special needle probe tool has been developed to be operated by the new NEES robot. Instrumentation, data acquisition and data processing issues associated with the needle probe robot tool are discussed. The basis for selection of materials, probe tip geometry, and the optimum frequency of AC electrical measurements is explained.",
keywords = "Centrifuge, Needle probe, NEES, Porosity, Resolution, Robot, Spatial variability",
author = "Zhihua Li and Kutter, {Bruce L.} and Wilson, {Daniel W.} and Kenneth Sprott and Jong-Sub Lee and Santamarina, {J. Carlos}",
year = "2005",
language = "English",
pages = "2087--2101",
booktitle = "Geotechnical Special Publication",
edition = "130-142",

}

TY - GEN

T1 - Needle probe application for high-resolution assessment of soil spatial variability in the centrifuge

AU - Li, Zhihua

AU - Kutter, Bruce L.

AU - Wilson, Daniel W.

AU - Sprott, Kenneth

AU - Lee, Jong-Sub

AU - Santamarina, J. Carlos

PY - 2005

Y1 - 2005

N2 - This paper addresses the development of an electrical resistivity needle probe to be deployed during centrifuge model testing to assess with high-resolution the spatial variability of soil electrical resistivity. The probe is able to detect thin layers and accurately resolve interfaces between soil layers. The prototype probes are made from thin, stainless steel needles, with an insulated wire inserted into the needle, and bonded to it with epoxy resin, to form a coaxial probe (Cho et al. 2004). Different tip shapes including single-wedge, double-wedge and cone have been developed to optimize the spatial resolution of porosity, soil interfaces and layering. The calibration and testing of the needle probe has been conducted both at Georgia Tech and UC Davis. This paper presents results of resistance versus depth and porosity versus depth, and compares the porosity based on measurement of mass and volume with the calculated porosity based on the needle probe measurements. Consequently, insertion effects are discussed and theoretical explanations are given. For its deployment in the centrifuge, a special needle probe tool has been developed to be operated by the new NEES robot. Instrumentation, data acquisition and data processing issues associated with the needle probe robot tool are discussed. The basis for selection of materials, probe tip geometry, and the optimum frequency of AC electrical measurements is explained.

AB - This paper addresses the development of an electrical resistivity needle probe to be deployed during centrifuge model testing to assess with high-resolution the spatial variability of soil electrical resistivity. The probe is able to detect thin layers and accurately resolve interfaces between soil layers. The prototype probes are made from thin, stainless steel needles, with an insulated wire inserted into the needle, and bonded to it with epoxy resin, to form a coaxial probe (Cho et al. 2004). Different tip shapes including single-wedge, double-wedge and cone have been developed to optimize the spatial resolution of porosity, soil interfaces and layering. The calibration and testing of the needle probe has been conducted both at Georgia Tech and UC Davis. This paper presents results of resistance versus depth and porosity versus depth, and compares the porosity based on measurement of mass and volume with the calculated porosity based on the needle probe measurements. Consequently, insertion effects are discussed and theoretical explanations are given. For its deployment in the centrifuge, a special needle probe tool has been developed to be operated by the new NEES robot. Instrumentation, data acquisition and data processing issues associated with the needle probe robot tool are discussed. The basis for selection of materials, probe tip geometry, and the optimum frequency of AC electrical measurements is explained.

KW - Centrifuge

KW - Needle probe

KW - NEES

KW - Porosity

KW - Resolution

KW - Robot

KW - Spatial variability

UR - http://www.scopus.com/inward/record.url?scp=17044414045&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=17044414045&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:17044414045

SP - 2087

EP - 2101

BT - Geotechnical Special Publication

ER -