OPTICAL FIBER MONITORING TECHNOLOGY FOR EVOLUTION CHARACTERISTIC OF ROCK STRATUM DEFORMATION AND FAILURE IN SPACE OF MINING FIELD

The deformation, movement and destroying of the surrounding rock in the laneway can happen during the mining of coal stratum. The dynamic change characteristics have important reference significance to the selection of the technical parameters such as laneway design and support. In the paper, combining the mining process of one working face in Huainan mine area, the testing section is laid in the coal laneway. Through laying the distributed fiber sensors in the drill hole, the strain parameters of rock stratum can be detected and analyzed during the deformation and failure processing of coal and rock strata. The law of deformation development of rock stratum in the section space and characteristics affected by mining can be discussed. The analysis results through the 16 groups monitoring data from 2 monitoring drill hole indicate that the producing shifting characteristics affected by mining in the floor rock stratum are obvious during the mining process of working face, and the development of the deformation locations often start from bedding plane because of interface control of rock stratum. The maximum deformation depth of the floor rock stratum is 14.1 m in the detection field, the results are basically consistent with the resistivity CT, and its appearing ahead of stress is very clear. All of the monitoring effect is well. The distributed fiber testing technology can be used as an effective method to distinguish accurately the evolutionary process of rock stratum deformation. It can make for studying deformation and destroy rules of rock stratum after stress in different conditions.