Observation of the rock slope thermal regime, coupled with crackmeter stability monitoring: Initial results from three different sites in Czechia (central Europe)

0545911 - ÚSMH 2022 RIV DE eng J - Článek v odborném periodiku
Racek, Ondřej - Blahůt, Jan - Hartvich, Filip
Observation of the rock slope thermal regime, coupled with crackmeter stability monitoring: Initial results from three different sites in Czechia (central Europe).
Geoscientific Instrumentation, Methods and Data Systems. Roč. 10, č. 2 (2021), s. 203-218. ISSN 2193-0856. E-ISSN 2193-0864
Grant CEP: GA TA ČR(CZ) SS02030023
Institucionální podpora: RVO:67985891
Klíčová slova: rock slope monitoring * rock mass stability * thermal regime * Czechia
Obor OECD: Geology
Impakt faktor: 1.500, rok: 2021
Způsob publikování: Open access
https://gi.copernicus.org/articles/10/203/2021/

This paper describes a newly designed, experimental, and affordable rock slope monitoring system. This system is being used to monitor three rock slopes in Czechia for a period of up to 2 years. The instrumented rock slopes have different lithology (sandstone, limestone, and granite), aspect, and structural and mechanical properties. Induction crackmeters monitor the dynamic of joints, which separate unstable rock blocks from the rock face. This setup works with a repeatability of measurements of 0.05g mm. External destabilising factors (air temperature, precipitation, incoming and outgoing radiation, etc.) are measured by a weather station placed directly within the rock slope. Thermal behaviour in the rock slope surface zone is monitored using a compound temperature probe, placed inside a 3g m deep subhorizontal borehole, which is insulated from external air temperature. Additionally, one thermocouple is placed directly on the rock slope surface. From the time series measured to date (the longest since autumn 2018), we are able to distinguish differences between the annual and diurnal temperature cycles of the monitored sites. From the first data, a greater annual joint dynamic is measured in the case of larger blocks, however, smaller blocks are more responsive to short-Term diurnal temperature cycles. Differences in the thermal regime between the sites are also recognisable and are caused mainly by different slope aspect, rock mass thermal conductivity, and colour. These differences will be explained by the statistical analysis of longer time series in the future.
Trvalý link: http://hdl.handle.net/11104/0324784