TY - CONF A1 - Habel, Wolfgang A1 - Hofmann, Detlef A1 - Döring, H. A1 - Jentsch, H. A1 - Senze, A. A1 - Kowalle, G. ED - Shi, B. T1 - Detection of a slipping soil area in an open coal pit by embedded fibre-optic sensing rods N2 - Movements in geological areas are mostly concentrated on faults or slipping zones. Detection of movements reaching critical values is of crucial importance to avoid losses and harms. The paper presents a new technology of detecting deformations and movements in soil or rock massifs. The core part of the sensing system is a tiny rod with embedded optical sensor fibres. This deformation measurement system was developed and the sensing rod can be installed in a borehole and enables the detection of beginning soil movements. The amount of deformation in soil or rock formations can then be estimated. The sensing rod has an outer diameter of 3 mm to 6 mm and contains several optical fibres. One fibre is used as online measurement system and provides integral strain information along the whole length of the rod. In case of a safety-relevant deformation (warning signal), the second sensing system based on fibre Bragg grating sensors positioned close to the expected shear zone will be activated and records then resulting deformations in detail. T2 - OSMG-2014 - 5th International forum on opto-electronic sensor-based monitoring in geo-engineering CY - Nanjing, China DA - 12.10.2014 KW - Fibre-optic strain sensor KW - Structural health monitoring KW - Soil stability monitoring KW - Early warning PY - 2014 SP - 1 EP - 7 AN - OPUS4-32664 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -