107 / 2023-05-30 19:56:11

利用SBAS-InSAR技术监测郓城煤矿地面沉降

关键词：Sentinel-1A；矿区沉降；SBAS-InSAR；监测精度；

Mine subsidence is a common geological hazard caused by deep underground engineering activities during the mining process. The impact of mine subsidence is widespread and can have varying degrees of impact on land use, urban construction and environmental protection, so it is important to carry out monitoring about ground subsidence to ensure the development of urban construction and people's well-being. The advantages of level measurement are the simplicity of the method and the low cost of the equipment, but the disadvantages are the long measurement period and the large amount of labour. The InSAR monitoring method has the advantage of large coverage and short repeat observation period. In order to be able to comprehensively grasp the historical evolution process and current status of surface subsidence at Yuncheng coal mine in Yuncheng County, this paper selected 28 views of C-band Sentinel I ascending orbit image data from 22 January 2019 to 5 April 2021 and processed them using the short baseline set time-series interferometry (SBAS-InSAR) technique to obtain 93 interferometric pairs to obtain the cumulative subsidence in the mining area during the study time period and the annual average subsidence rate over the study period. The following conclusions were drawn from the analysis in conjunction with the actual mining conditions in the mine area: (1) During the study period, the ground surface of the mine area experienced different degrees of subsidence, with the total area of subsidence being approximately 123.38km², accounting for approximately 44.08% of the total study area. Among them, a large settlement occurred on the south side of working face 1303, with the cumulative settlement amount ranging from -380 to -280mm, with a settlement area of approximately 0.52km², accounting for approximately 0.19% of its total study area. (2) The settlement area with cumulative settlement between -40 and 0mm is approximately 53.63km², distributed on the west side of working face 1303 and accounting for 19.16% of the total study area. The maximum annual average subsidence rate in the study area is 163mm/a, which is basically located on the southern surface of the 1303 workings. (3) The accuracy of the SBAS-InSAR monitoring results was verified by using the measured level data. The results showed that most of the SBAS-InSAR monitoring values were consistent with the level monitoring values in terms of the subsidence trend in time, and in terms of the spatial scale, the subsidence trend remained consistent, which proved the monitoring accuracy and reliability of the method and could achieve good monitoring results in practical applications.