Monitoring of settlement in mining industrial square based on optimal PS point acquisition method

doi:10.16265/j.cnki.issn1003-3033.2024.05.1436

Abstract

Abstract:

To ensure the safety of the mining ground and underground workers, residents around the industrial square, and the operation of the coal transportation system, real-time monitoring of surface deformation is carried out. An optimized method for acquiring PS points is proposed to enhance the applicability of PS-InSAR technology in settlement monitoring. Firstly, a to total of 26 Sentinel-1A satellite images during the subsidence period of the Industrial Square coal pillar II 513 working face in the Huainan suburban coal mine from October 31, 2020, to August 22, 2022, were selected. The PS-InSAR technology was used to determine the optimal method for selecting PS point targets. Then, based on this method, the ground subsidence rate and cumulative subsidence of the mining damage protection zone during the mining process of the working face were obtained. Finally, the accuracy of PS-InSAR monitoring was verified based on the measured data of ground leveling points, and the dynamic subsidence of the study area's ground and structures was analyzed. The results show that the dual-threshold method of coherence coefficient and amplitude dispersion index is more suitable for subsidence monitoring in the study area. The maximum detectable subsidence rate in the study area is -26.5 mm/year, and the maximum cumulative subsidence value is -53.7 mm. Additionally, geological hazards related to karst collapse were detected in the northwest of the study area. By using leveling data for accuracy verification, the root mean square error (RMSE) is only 3.8mm, and the coefficient of determination reaches 0.91.

Key words: persistent scatterer(PS), interferometry synthetic aperture radar(InSAR), industrial square, settlement monitoring, coherence coefficient, amplitude dispersion index

CLC Number:

X936

YANG Keming, LI Tingting, MA Jun, LI Yaxing, JIANG Kegui, ZHAO Xiangtong. Monitoring of settlement in mining industrial square based on optimal PS point acquisition method[J]. China Safety Science Journal, 2024, 34(5): 44-51.

Figures/Tables 10

Table 1

Fig.1

Fig.2

Table 2

Results of PS with three methods

方法	阈值	总点数	有效点	准确率/%
γ⁰	0.8	257	229	89
	0.7	446	379	85
	0.6	966	705	73
$D 0 A$	0.5	149	138	93
	0.6	382	328	86
	0.7	573	395	69
γ⁰/ $D 0 A$	0.7/0.6	243	101	95

Table 2

Fig.3

Fig.4

Fig.5

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Fig.7

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工作面	开采日期	停采日期	平均采深/m	平均采厚/m	推进长度/m	工作面长度/m	煤层倾角/(°)
Ⅱ311	2018年2月9日	2019年7月27日	242	3.3	550	240	8~18
Ⅱ513	2021年3月15日	2021年11月15日	264	3.3	330	220	6~18