Rock Surface Strain In Situ Monitoring Affected by Temperature Changes at the Pozary Field Lab (Czechia)

0571767 - ÚSMH 2024 RIV CH eng J - Journal Article
Racek, Ondřej - Balek, Jan - Loche, Marco - Vích, D. - Blahůt, Jan
Rock Surface Strain In Situ Monitoring Affected by Temperature Changes at the Pozary Field Lab (Czechia).
Sensors. Roč. 23, č. 4 (2023), č. článku 2237. E-ISSN 1424-8220
R&D Projects: GA TA ČR(CZ) SS02030023; GA TA ČR(CZ) TP01010055
Institutional support: RVO:67985891
Keywords : monitoring system * strain gauges * rock mass * thermal behavior * slope stability
OECD category: Geology
Impact factor: 3.9, year: 2022
Method of publishing: Open access
https://doi.org/10.3390/s23042237

The evaluation of strain in rock masses is crucial information for slope stability studies. For this purpose, a monitoring system for analyzing surface strain using resistivity strain gauges has been tested. Strain is a function of stress, and it is known that stress affects the mechanical properties of geomaterials and can lead to the destabilization of rock slopes. However, stress is difficult to measure in situ. In industrial practice, resistivity strain gauges are used for strain measurement, allowing even small strain changes to be recorded. This setting of dataloggers is usually expensive and there is no accounting for the influence of exogenous factors. Here, the aim of applying resistivity strain gauges in different configurations to measure surface strain in natural conditions, and to determine how the results are affected by factors such as temperature and incoming solar radiation, has been pursued. Subsequently, these factors were mathematically estimated, and a data processing system was created to process the results of each configuration. Finally, the new strategy was evaluated to measure in situ strain by estimating the effect of temperature. The approach highlighted high theoretical accuracy, hence the ability to detect strain variations in field conditions. Therefore, by adjusting for the influence of temperature, it is potentially possible to measure the deformation trend more accurately, while maintaining a lower cost for the sensors.
Permanent Link: https://hdl.handle.net/11104/0342853