煤矿采空区地表沉陷时序InSAR监测与分析

Monitoring and Analysis on Surface Subsidence Timeseries InSAR in Coal Mining Area

摘要:

开展矿区地表沉陷监测对于矿山地质环境保护与土地复垦具有重要意义。该文采用短基线集合成孔径雷达干涉测量（SBASInSAR）技术，对山东省某煤矿2021年11月7日至2022年3月19日期间的采空区地表沉陷情况进行了监测，获取了监测区域的年均沉降速率和时序沉降量，分析了地表沉陷时空分布特征和监测精度。结果表明，研究区域内最大年均沉降速率达到679.2 mm/a，累计沉降量最大为258.7 mm，监测到的沉降空间位置与实际开采工作面空间位置十分吻合，沉陷盆地走向和倾向沉降曲线均呈“V”型，表明SBASInSAR监测到的采空区地表沉陷位置、范围和时空连续变化趋势与煤矿实际开采情况相符，可有效获取煤矿采空区的地表沉陷信息。

Abstract:

Carrying out surface subsidence monitoring in mining areas is of great significance for the protection of mine geological environment and land reclamation. In this paper, by using shortbaseline integrated aperture radar interferometry (SBASInSAR) technology, surface subsidence of the goaf in a coal mine in Shandong province from November 7th, 2021 to March 19th, 2022 has been monitored. The annual average settlement rate and temporal settlement amount of the monitored area are obtained, and the spatiotemporal distribution characteristics of surface subsidence have been analyzed. It is showed that the maximum annual average subsidence rate in the study area can reach 679.2mm/a, and the maximum cumulative subsidence is 258.7mm. The monitored subsidence spatial position is in good agreement with the actual mining face spatial position. The subsidence basin direction and dip subsidence curve show a "V" shape. It is indicated that the surface subsidence position, range and spatiotemporal continuous change trend of the goaf monitored by InSAR are consistent with the actual mining situation of the coal mine. It can effectively obtain surface subsidence information of the goaf.