In recent years, the mined-out area resulting in more than 20 goaf collapse disasters in the north Pizhou, Jiangsu Province. The traditional monitoring method of surface soil deformation is difficult to meet the requirement of advance prediction of surface subsidence. In order to solve the lack of monitoring and early warning mechanism of mined-out subsidence in gypsum mining area, a monitoring and early warning system based on fiber sensing technology was developed in this area. According to the results of preliminary investigation, analysis and numerical simulation, the ground collapse mechanism of gypsum mine is deduced, dynamic monitoring of groundwater level, displacement of deep rock and soil mass and microseismic monitoring of bottom aquifer above loose layer were monitored by optical fiber sensor, in the course of monitoring, the alarm will be triggered when the fluctuation of water level and the displacement of rock and soil suddenly exceed the normal fluctuation value or when a strong vibration signal is received, and the effective early warning will be carried out in the early stage of the ground collapse, and can provide adequate lead time for disaster prevention and mitigation efforts. Through the implementation of monitoring and early-warning work, the validity of these monitoring and early-warning means has been verified, which can provide data basis and scientific basis for the monitoring, prediction and prevention of ground subsidence in mining areas, it can also provide reference for prevention, control, monitoring and early warning of ground collapse geological disaster in gypsum mine and other similar conditions.

Monitoring and Warning System for Ground Subsidence of Gypsum Mine Based on Fiber Sensing

Experimental study on distributed optical fiber sensing monitoring for ground surface deformation in extra-thick coal seam mining under ultra-thick conglomerate

Soil deformation monitoring plays an important role in damage prevention of land deformation. In this paper, distributed monitoring model tests using airbag method are carried out to study the development of land deformation. The technical principles and test program of distributed fiber optic monitoring are introduced and the monitoring results under different conditions are analyzed. These results indicate that the distributed optical fiber monitoring technology can be effectively used to the deformation monitoring of soil under different conditions. The formation of arched area and land deformation can be located by thesaddle type strain distribution curve. This technology can be applied to monitor the soil deformation during the development of land deformation.

Model test on distributed optical fiber monitoring of land subsidence and ground fissures

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Model test on distributed optical fiber monitoring of land subsidence and ground fissures