Additionally, one thermocouple is placed directly on the rock slope surface. Thermal behaviour in the rock slope surface zone is monitored using a compound temperature probe, placed inside a 3 m deep subhorizontal borehole, which is insulated from external air temperature. External destabilising factors (air temperature, precipitation, incoming and outgoing radiation, etc.) are measured by a weather station placed directly within the rock slope. This setup works with a repeatability of measurements of 0.05 mm. Induction crackmeters monitor the dynamic of joints, which separate unstable rock blocks from the rock face. The instrumented rock slopes have different lithology (sandstone, limestone, and granite), aspect, and structural and mechanical properties. This system is being used to monitor three rock slopes in Czechia for a period of up to 2 years. This paper describes a newly designed, experimental, and affordable rock slope monitoring system.
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