Use of wire extensometers for monitoring pavement performance in areas of slope instability

Kirjan, Jeremy Nicholas (2013) Use of wire extensometers for monitoring pavement performance in areas of slope instability. [USQ Project]


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In 1998, the Gregory Developmental Road was diverted around the western side of the Highway-Reward Mine to allow overburden stripping operations in the open cut. In 2005, mining operations concluded, but several months later cracking was detected in the pavement of the Gregory Developmental Road (Coffey Geotechnics 2011a). This cracking is thought to be the result of slope instability in the western wall of the open cut mine.

The Department of Transport and Main Roads, Queensland (TMR) were requested to provide an instrumentation and monitoring system for the site. The monitoring is required to provide data that can be used to analyse ground movements and to provide an early-warning system to notify TMR staff of any road surface deformations that may impose a risk to road users.

For the basis of the monitoring system, several types of instrumentation were considered. Case studies of instrumentation installations used to monitor slope instability were examined in an attempt to identify the most suitable system. Wire extensometers were eventually selected as the best solution for the site. A system of 3 wire extensometers and a weather station, connected to satellite telemetry was installed on the remote site, as the basis of the early-warning instrumentation system.

The wire extensometer system required the design and fabrication of unique hardware for the installation to be successful. A satellite telemetry system was selected to provide reliable communication of the collected data, and in order to prevent vandalism and threat from fire, the logging, power, telemetry and weather station systems were installed on a custom-designed 8-metre tall mid-hinged pole. Temperature sensors at each of the wire extensometer locations were also fitted in order to determine if the extreme temperature fluctuations have any effect on the operation of the extensometers.

Data from the instruments located on site is automatically sent to a web server, where it can be viewed by key personnel. The system will also provide automatic alerts in the form of SMS messages if the devices detect movement or rainfall in excess of the predetermined thresholds.

The wire extensometer system provides a unique solution to the requirement for a reliable early-warning system on the remote site. The proven success and reliability of the system has provided a cost effective alternative to traditional instrumentation systems for monitoring pavements in the vicinity of unstable slopes. In addition, the data provided by the weather station will be made available to the Bureau of Meteorology (BOM) for inclusion in its nationwide distribution network.

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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Engineering (Civil) Project.
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Supervisors: Shiau, Jim
Date Deposited: 05 Sep 2017 05:32
Last Modified: 25 Jan 2023 06:18
Uncontrolled Keywords: extensometers; Gregory Development Road; road monitoring; instrumentation; road surface deformations
Fields of Research (2008): 09 Engineering > 0905 Civil Engineering > 090507 Transport Engineering
Fields of Research (2020): 40 ENGINEERING > 4005 Civil engineering > 400512 Transport engineering

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