SBAS-InSAR-based monitoring and inversion of surface subsidence of the Shadunzi Coal Mine in Hami City, Xinjiang
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摘要: 矿区地表沉陷监测能够为当地安全生产防护、开采规划和管理提供关键支撑信息。以新疆哈密砂墩子煤田矿区为研究对象,利用SBAS InSAR方法调查了其于2018年9月—2019年10月期间的地表沉陷特征。InSAR形变监测结果显示砂墩子矿主井西北侧存在一个沉陷漏斗,最大年均沉陷速率约为150 mm/a。时序形变结果显示沉陷漏斗在2018年9月—2019年6月间发生明显线性下沉,而之后逐渐趋于稳定。基于InSAR观测形变,采用Okada矩形位错模型反演得到砂墩子矿综采面采深约349.89 m,走向长约1 001.27 m,倾向宽约211.80 m; 结合煤层视密度估算得到该矿在2018—2019年间开采量约3.18 Mt,与已有资料报道的该矿年产能基本一致。本研究为利用InSAR形变约束反演煤矿综采面参数,并结合煤层视密度构建综采面参数与开采量之间关系提供了一种可行思路。
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关键词:
- 开采沉陷 /
- 砂墩子矿 /
- SBAS InSAR /
- 参数反演
Abstract: The monitoring of surface subsidence in mining areas can provide key information for local production safety protection and mining planning and management. Based on the Sentinel-1A images from September 2018 to October 2019, this study characterized the surface subsidence in the mining area of the Shadunzi Coal Mine in Hami City, Xinjiang, China using the combined small baseline subset (SBAS) and interferometric synthetic aperture radar (InSAR) analysis. The InSAR measurement results revealed a subsidence funnel with a maximum subsidence rate of about -150 mm/a to the northwest of the main shaft of the coal mine. As indicated by the displacement time series, the subsidence funnel showed a significant linear subsidence pattern from September 2018 to June 2019 and gradually stabilized thereafter. Then the surface deformation inversion was conducted using the Okada rectangular dislocation model to obtain the parameters of the working face of the coal mine. The modeling results showed that the working face had a depth of about 349.89 m, a length of about 1 001.27 m, and a width of about 211.80 m. Based on the inversion results as well as the apparent density of the coal seams, the annual mining capacity of the coal mine was estimated to be about 3.18 Mt during 2018—2019, which is consistent with the reported annual production capacity of the coal mine. This paper provides a feasible way to conduct the parameter inversion of coal mine working face under the constraints of InSAR measurements and to infer the relationship between the working face parameters and the mining capacity according to the apparent density of coal seams.-
Key words:
- mining-induced surface subsidence /
- Shadunzi Coal Mine /
- SBAS-InSAR /
- parameter inversion /
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