GPR MONITORING OF SPACE BETWEEN LINING AND ROCK IN UNDERGROUND MINES

In the past decade, ground penetrating radar (GPR) has many times been successful in detection of defects in the space between lining and rock mass in underground mines. As a rule, it is difficult to obtain high-quality data in tunnel measurements owing to limited conditions of information gathering and due to multiple unwanted air interference, which degrades interpretations. It is almost impossible to identify deep reflections from the background in case of heavy noise. The critical tool in such case is the analysis of wave field attributes: dynamic and kinematic properties of useful signal. This article gives an example of GPR sounding using different types of antenna assemblies with automatic analysis of the backscattered field quality. Under comparison are the cross sections obtained in the test monitoring of the lining/rock interface after injection reinforcement of weakened zone behind the tunnel lining in the Saint-Petersburg Metro. The results show that the attribute analysis improves quality of GPR data interpretation and is an efficient method of detecting defects at the lining–soil interface.

For citation: Andrianov S. V. Мониторинг состояния заобделочного пространства горных выработок методом георадиолокации. Gornyy informatsionno-analiticheskiy byulleten'. 2019;5:124132. [In Russ]. DOI: 10.25018/0236-1493-2019-05-0-124-132.

Keywords

Ground penetrating radar, attribute analysis, diffraction, backscattered field, tunnel, reinforced concrete lining.

Issue number: 5
Year: 2019
ISBN: 0236-1493
UDK: 550.3:624.191.22
DOI: 10.25018/0236-1493-2019-05-0-124-132
Authors: Andrianov S. V.

About authors: S.V. Andrianov, Junior Researcher, e-mail: andrianovsemen@gmail.com, OJSC «SRPSI «Lenmetrogiprotrans», 191002, Saint-Petersburg, Russia.

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