Surface subsidence monitoring in mining areas is regarded as an essential basis for parameter inversion of subsidence prediction. Although traditional leveling surveys provide high accuracy, their application is limited by sparse observation points and intensive workload. Interferometric synthetic aperture radar (InSAR) technology enables large-scale monitoring with high spatiotemporal resolution. However, decorrelation often occurs in areas of steep gradients and rapid deformation, which restricts its applicability. The surface subsidence caused by coal seam mining in the Linxi mine was taken as a case, and the spatiotemporal characteristics of monitoring accuracy between leveling and InSAR were compared. A fusion method of InSAR and leveling data based on surface subsidence velocity was then proposed to invert the parameters of the probability integral method(PIM). The results show that with the expansion of rapid subsidence zones, the area of InSAR decorrelation gradually increases; in regions of steep gradients, monitoring errors followed an “increase-stabilization” pattern, which is closely related to subsidence velocity variations induced by multi-panel mining. Based on subsidence velocity, incoherent and coherent regions were delineated, and leveling data was introduced to compensate for InSAR decorrelation in rapid subsidence zones, ensuring the continuity and accuracy of parameter inversion. Verification with field data demonstrates that the proposed method significantly reduces the workload of leveling surveys while improving inversion accuracy, indicating strong practical applicability.
ZHANG Hong-zhi, JING Sheng-qiang, YI Si-hai, GAO Peng-cheng, CHEN Wen-cong, CAI Xiang-jun, LI Xin-liang.
Inversion Method of Probability Integral Prediction Parameters Based on Sinking Velocity and Multi-source Data Fusion: Linxi Mine in Tangshan[J].
Science Technology and Engineering, 2026, 26(12): 5012-5021 DOI:10.12404/j.issn.1671-1815.2503656
近年来,InSAR技术与概率积分法(probability integral method, PIM)等矿山沉陷预测模型逐步融合,成为提升矿区地表沉陷监测与预测精度的重要方向。概率积分法是目前矿山沉陷预测中应用最为广泛的解析模型[19]。该方法基于随机介质理论,通过少量参数即可较好地描述沉陷盆地的空间形态,具有参数物理意义明确、适应性强和计算效率高等优点。在已有研究中,一类研究聚焦于提升大梯度沉陷区的监测能力。陈洋等[20]通过将概率积分法与InSAR结果分区融合,实现对大、中、小变形区域的分层监测。李全生等[21]利用概率积分模型对InSAR数据进行相位修复,从而实现大梯度沉陷区的三维形变监测。另一类研究则利用InSAR数据与其他监测数据融合,对概率积分法参数进行反演。胡东升等[22]以相干性为依据,将InSAR与无人机监测数据融合,并基于融合数据进行概率积分法参数反演。总体来看,前者方法的监测精度依赖于概率积分法参数的准确性,而后者方法在大梯度沉陷区反演时存在较大误差,且多源数据融合的阈值选择缺乏统一的理论依据。
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