Detecting Subsurface Voids Using Ground-Coupled Penetrating Radar PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Detecting Subsurface Voids Using Ground-Coupled Penetrating Radar PDF full book. Access full book title Detecting Subsurface Voids Using Ground-Coupled Penetrating Radar by Dar Hao Chen. Download full books in PDF and EPUB format.
Author: Dar Hao Chen Publisher: ISBN: Category : Earth pressure Languages : en Pages : 8
Book Description
Detecting the presence and extent of subsurface voids under a roadway structure is critical in preventing major failures from occurring. In this study, a 400 MHz Ground-coupled Penetrating Radar (GCPR) was utilized in four projects to locate voids. The air voids present a strong dielectric contrast to GPR waves and therefore these anomalies are clearly identified on GCPR results/plots. In one study, a large void more than 1.8 m in depth was located under the continuous reinforced concrete pavement on IH40 in the Amarillo District of Texas. In total, 3.8 cubic metres of flowable fill was used to fill the void. Voids with depths from 50 to 400 mm were identified and verified in studies on SH6, IH35, and Spur 380. The voids are typically located directly under the surface pavement layer. This study has successfully demonstrated that the GCPR is able to identify void locations. However, drilling and coring should also be done to determine the extent and depth of the void.
Author: Dar Hao Chen Publisher: ISBN: Category : Earth pressure Languages : en Pages : 8
Book Description
Detecting the presence and extent of subsurface voids under a roadway structure is critical in preventing major failures from occurring. In this study, a 400 MHz Ground-coupled Penetrating Radar (GCPR) was utilized in four projects to locate voids. The air voids present a strong dielectric contrast to GPR waves and therefore these anomalies are clearly identified on GCPR results/plots. In one study, a large void more than 1.8 m in depth was located under the continuous reinforced concrete pavement on IH40 in the Amarillo District of Texas. In total, 3.8 cubic metres of flowable fill was used to fill the void. Voids with depths from 50 to 400 mm were identified and verified in studies on SH6, IH35, and Spur 380. The voids are typically located directly under the surface pavement layer. This study has successfully demonstrated that the GCPR is able to identify void locations. However, drilling and coring should also be done to determine the extent and depth of the void.
Author: Zhiyong Zhao Publisher: ISBN: Category : Languages : en Pages : 332
Book Description
As traffic volumes grow and pavements age, city streets in urban areas are vulnerable to the potentially dangerous problems such as subsurface voids. These subsurface voids can significantly reduce the bearing strength of pavements and eventually result in the collapse of city streets. Several nondestructive testing (NDT) methods have been studied to detect subsurface voids during the past two decades. However, these studies mainly focused on detecting small voids close to the surface of the highway pavements. As far as urban area is concerned, few studies have been conducted to evaluate the capacities of NDT methods to locate subsurface voids. Moreover, congested and complex subsurface circumstance makes it more challenging to evaluate subsurface conditions.
Author: Rexford M. Morey Publisher: Transportation Research Board ISBN: 9780309061100 Category : Technology & Engineering Languages : en Pages : 48
Book Description
This synthesis will be of interest to state Department of Transportation (DOT) geotechnical, bridge, and pavement engineers, engineering geologists, consultants involved with ground penetrating radar (GPR) investigations for state DOTs, and researchers. It describes the current state of the practice of using GPR for evaluating subsurface conditions for transportation facilities. This was accomplished by conducting a literature search and review and an extensive survey of U.S. and Canadian transportation agencies and practitioners, as well as limited international information collection. GPR is a noninvasive nondestructive tool used in transportation applications such as evaluation and characterization of pavement systems, soils, and environmental problems. This report of the Transportation Research Board presents information on the principles, equipment, logistics, applications, and limitations of GPR pertaining to transportation applications. Selected case studies for which ground truth information is available are presented. In addition, an extensive bibliography and glossary are provided as well as appending information about GPR manufacturers from their literature.
Author: Jens Munk Publisher: ISBN: Category : Geophysics Languages : en Pages : 42
Book Description
Results of ground-penetrating radar surveys at three highway sites indicate that subsurface penetration varies widely with geologic material type and amount of cultural interference. Two highway sites were chosen over abandoned underground coal mines in eastern Ohio. A third site in western Ohio was chosen in an area known to be underlain by naturally occurring voids in limestone.
Author: Timo Saarenketo Publisher: ISBN: Category : Ground penetrating radar Languages : en Pages : 56
Book Description
This report will describe the various kinds of information that can be obtained from roads and highways with Ground Penetrating Radar. In the last 5 years, attention has focused on measuring the thickness of the asphalt surfacing layer on flexible pavements with air-launched horn antennas. Other antennas are available with substantially different depths of penetration, and for use in a wide range of other pavement applications. The purpose of this report is to describe the range of applications of GPR in pavement evaluation. Cases include subgrade investigations, bedrock evaluations, locating sinkholes, detecting frost damage, and identifying defects such as stripping or voids and monitoring crack growth within the pavement structure. The large variety of cases, conducted in Texas and Finland, illustrates the unique ability of GPR to rapidly evaluate subsurface conditions. The sinkhole detection study represents our initial effort to use low frequency deep penetrating radar on Texas pavements. A unique feature of this paper is the proposed classification of the frost susceptibility of subgrade soils by their measured dielectric constant and electrical conductivity.
Author: Tom Scullion, Stefan Hurlebaus, Dan Zollinger, Zachary Grasley, Soheil Nazarian, Hoda Azari, Deren Yuan, Parisa Shokouhi, Timo Saarenketo, Fulvio Tonon, Transportation Research Board Publisher: Transportation Research Board ISBN: 0309274486 Category : Languages : en Pages : 686
Book Description
This report from the second Strategic Highway Research Program (SHRP 2), which is administered by the Transportation Research Board of the National Academies, identifies techniques that provide useful information for evaluating tunnel linings.
Author: Dar Hao Chen
Author: Dar Hao Chen
Author: Ronald H. Church
Author: Zhiyong Zhao
Author: Rexford M. Morey
Author: 
Author: Jitesh Batra
Author: Jens Munk
Author: Ronald H. Church
Author: Timo Saarenketo
Author: Tom Scullion, Stefan Hurlebaus, Dan Zollinger, Zachary Grasley, Soheil Nazarian, Hoda Azari, Deren Yuan, Parisa Shokouhi, Timo Saarenketo, Fulvio Tonon, Transportation Research Board