Journal Published Online: 10 May 2006
Volume 29, Issue 4

Development of TDR Penetrometer Through Theoretical and Laboratory Investigations: 1. Measurement of Soil Dielectric Permittivity

CODEN: GTJODJ

Abstract

To better characterize a bulk soil electrically, both the electrical conductivity and dielectric permittivity should be measured. This study developed a time domain reflectometry (TDR) penetrometer to allow simultaneous measurements of dielectric permittivity and electrical conductivity during cone penetration. A TDR penetrometer is formed by placing a multiple-conductor waveguide around a nonconducting shaft. Probe design considerations and calibration methods for measuring dielectric constant were first theoretically discussed and then evaluated through laboratory investigations. A prototype TDR penetrometer was fabricated and used to perform simulated penetration tests in a calibration chamber. The effect of penetration disturbance on dielectric constant is quantitatively reported and explained. The implications of the data that can be measured by the TDR penetrometer are also discussed.

Author Information

Lin, CP
Civil Engineering, National Chiao Tung University, Hsinchu, Taiwan
Tang, SH
Civil Engineering, National Chiao Tung University, Hsinchu, Taiwan
Chung, CC
Civil Engineering, National Chiao Tung University, Hsinchu, Taiwan
Pages: 8
Price: $25.00
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Stock #: GTJ14093
ISSN: 0149-6115
DOI: 10.1520/GTJ14093