Abstract

A tailings storage facility (TSF) is a geotechnical engineering structure, composed of fine-grained mine wastes, waste rocks, and soils. This structure has a characteristic of simultaneous construction of dam body and hydraulic filling of tailings. Recently, reported TSF failures alerted that sustainable and safe management is required for TSFs under and post-construction.

In South Korea, TSFs are managed by Korea Mine Rehabilitation and Mineral Resources Corporation (KOMIR). Because TSFs are often located in remote areas, the monitoring system is needed to take prompt action such as an early warning system to minimize damage and environmental problems. We report the ICT based monitoring system and stability analysis for Jiknaegol TSF. The monitoring system is composed of monitoring sensor network and monitoring system server. The monitoring sensor network includes piezometer, water level meter, inclinometer, extensometer, and rain gauge. The collected monitoring data are transmitted to the monitoring dashboard, enabling remote management of Jiknaegol TSF.

To assess Jiknaegol TSF stability, rainfall infiltration and slope stability analysis using FLAC 2D Ver 8.1 is conducted based on monitoring data. Unsaturated soil properties are considered because water contents of tailings and soils are continuously changing because of rainfall, seepage, and evaporation. These properties directly affect TSF stability because of effective stress change with variation of soil unit weight in the unsaturated zone. The results of the simulation on the TSF is then used to establish the TSF management based on the monitoring.

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