Evaluation of terrestrial laser scanner accuracy in the control of hydrotechnical structures

• Autorzy: Muszyński Z. , Rybak J.

Identyfikatory

DOI

10.1515/sgem-2017-0036

• Języki publikacji: EN

Abstrakty

EN

In many cases of monitoring or load testing of hydrotechnical structures, the measurement results obtained from dial gauges may be affected by random or systematic errors resulting from the instability of the reference beam. For example, the measurement of wall displacement or pile settlement may be increased (or decreased) by displacements of the reference beam due to ground movement. The application of surveying methods such as high-precision levelling, motorized tacheometry or even terrestrial laser scanning makes it possible to provide an independent reference measurement free from systematic errors. It is very important in the case of walls and piles embedded in the rivers, where the construction of reference structure is even more difficult than usually. Construction of an independent reference system is also complicated when horizontal testing of sheet piles or diaphragm walls are considered. In this case, any underestimation of the horizontal displacement of an anchored or strutted construction leads to an understated value of the strut’s load. These measurements are even more important during modernization works and repairs of the hydrotechnical structures. The purpose of this paper is to discuss the possibilities of using modern measurement methods for monitoring of horizontal displacements of an excavation wall. The methods under scrutiny (motorized tacheometry and terrestrial laser scanning) have been compared to classical techniques and described in the context of their practical use on the example hydrotechnical structure. This structure was a temporary cofferdam made from sheet pile wall. The research continuously conducted at Wroclaw University of Science and Technology made it possible to collect and summarize measurement results and practical experience. This paper identifies advantages and disadvantages of both analysed methods and presents a comparison of obtained measurement results of horizontal displacements. In conclusion, some recommendations have been formulated, which are relevant from the point of view of engineering practice.

Słowa kluczowe

EN

geodetic measurements; horizontal displacements; motorized tacheometry; LIDAR

• Wydawca: De Gruyter
• Czasopismo: Studia Geotechnica et Mechanica
• Rocznik: 2017
• Tom: Vol. 39, nr 4
• Strony: 45--57
• Opis fizyczny: Bibliogr. 15 poz., rys., tab.

Twórcy

autor

Muszyński Z.

• Wrocław University of Science and Technology, Faculty of Geoengineering, Mining and Geology, Wrocław, Poland

autor

Rybak J.

• Wrocław University of Science and Technology, Faculty of Civil Engineering, Wrocław, Poland

Bibliografia

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).