基于星载InSAR和地面测量的小回沟煤矿地表移动监测与分析

    Monitoring and analysis of surface movement in Xiaohuigou Coal Mine based on satellite-based InSAR and ground-based measurement

    • 摘要: 煤炭资源地下开采会导致地表沉陷等地质灾害问题。为了定量研究小回沟煤矿地面沉陷的时空演变特征,使用2017—2023年的Sentinel-1卫星数据进行基于相干性的SBAS-InSAR处理,获取矿区地表形变时间序列,结果与实际开采情况吻合。联合地表移动观测站实测数据,定量分析地面下沉和水平移动的时空演变特征,以及地裂缝的发育情况。根据矿区地表动态沉陷结果对Logistic时间函数模型的参数进行反演,建立地表沉陷动态预测模型。研究结果表明:①采用基于相干性的SBAS方法和公共点叠加方法能够有效提高InSAR监测精度,地表最大下沉位于2204工作面,下沉值达到685.52 mm。②通过联合地表移动观测站实测数据,Q测线在2204工作面区间水平移动较大,M测线和N测线在垂直走向上整体向东移动。③Logistic模型与地表移动时空演变特征相吻合,基于模型对实测数据进行验证分析,平均拟合中误差约为13.67 mm,平均拟合相对中误差约为3.71%。研究结果可为小回沟煤矿地表移动动态监测和预测提供科学依据。

       

      Abstract: The exploitation of underground coal resources will result in a series of environmental disasters. In order to quantitatively analyze the spatial-temporal evolution characteristics of surface subsidence in Xiaohuigou Coal Mine, it processes Sentinel-1 satellite data from 2017 to 2023 by coherence-based SBAS-InSAR method, obtaining a time series of surface deformation in the mining area that aligns with actual mining conditions. Measurements from the joint surface movement observation station is used to quantitatively analyze the temporal and spatial evolution characteristics of surface subsidence, horizontal movement, and development of ground fissures. Based on the dynamic subsidence results of the mining area, invert the parameters of the Logistic time function model and establish a dynamic prediction model for surface subsidence. The results show that the coherence based SBAS method and the common point superposition method can effectively improve the InSAR monitoring accuracy. The maximum surface subsidence is located at the working face 2204, and the subsidence value reaches 685.52 mm. According to the measured data of the joint surface movement observation station, the Q survey line moves horizontally in the working face 2204, and the M survey line and the N survey line move eastward in the vertical trend. Logistic model is consistent with the spatio-temporal evolution characteristics of surface movement. Based on the model, the measured data are verified and analyzed. The average median error of fitting is about 13.67 mm, and the average relative median error of fitting is about 3.71%. The results of this paper can provide scientific basis for dynamic monitoring and prediction of surface movement in Xiaohuigou Coal Mine.

       

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