鹤岗煤矿区地面沉降时空特征InSAR时间序列监测研究

InSAR Time Series Monitoring of Spatiotemporal Characteristics of Land Subsidence in Hegang Coal Mining Area

随着煤矿资源的开采,鹤岗地区地面沉降现象逐渐加剧。以鹤岗煤矿区作为研究对象,收集2019年8月31日—2021年8月20日的59景Sentinel-1B SAR影像,采用SBAS时间序列InSAR技术提取煤矿开采引起的地面沉降。对鹤岗煤矿区地面沉降在空间上的演化过程进行分析,重点研究了鹤岗南部富力煤矿、兴安煤矿和峻德煤矿地表形变的时空演化特征,结果表明:鹤岗煤矿区的地面沉降呈现出不均匀、漏斗式的运动特征,提取的19个沉降漏斗全部对应鹤岗煤田开采区,最大形变位于新陆煤矿开采区,形变速率约370mm/a。在研究期内,自相对于第一景影像的沉降漏斗形成后,后续矿井开采沉降漏斗的空间形态基本保持不变。鹤岗南部富力煤矿和兴安煤矿4号形变点所在工作面的地表形变仍然处于快速下沉状态,有必要持续跟踪。

Due to the massive exploitation of coal resources,the phenomenon of land subsidence in Hegang area has gradually intensified,affecting the safe production and life of local residents.In this study,we took the Hegang coal mining area as the case study,collected Sentinel-1B SAR data of 59 scenes from August 31,2019 to August 20,2021,and used the SBAS time series InSAR technique to invert the land subsidence caused by coal mining.The spatial evolution process of land subsidence in Hegang coal mining area is analyzed.The results show that the deformation extracted by InSAR presents obvious non-uniform,irregular and funnel-like motion,the average surface deformation rate reaches a maximum of 370mm/a,and the surface uplift deformation rate reaches a maximum of 75mm/a.The 19 land subsidence funnels extracted by InSAR have the characteristics of discrete distribution,different shapes and clear boundaries,and are mainly distributed in Xing'an district and Nanshan district of Hegang.The main conclusions are as follows:①Hegang coal mining accelerates the surface subsidence movement.②During the research period,since the formation of the settlement funnel relative to the first image,the spatial shape of the subsequent mining settlement funnel has remained basically unchanged.③The surface deformation of the working face where the No.4 deformation point of the Fuli Coal Mine and Xing'an Coal Mine in the south of Hegang is still in a state of rapid subsidence requires continuous tracking.