基于TSS-DInSAR方法的注浆采区地表动态沉降分析

来源期刊:中南大学学报(自然科学版)2020年第7期

论文作者:杨可明 王剑 董祥林 姚树一 石晓宇

文章页码:1924 - 1936

关键词:DInSAR;时序叠加;开采沉陷;注浆充填;减沉分析

Key words:DInSAR; time series stacking; mining subsidence; grouting filling; analysis of reducing subsidence

摘    要:采用二轨法的时序叠加DInSAR(TSS-DInSAR)方法,获取淮北矿业集团临涣煤矿部分注浆充填的Ⅱ2采区在2016-11-21—2017-02-25的地表时序下沉速率、时序累积沉降信息,在此基础上对此采区地表动态沉降规律进行分析,并利用实测水准数据进行精度验证与回归分析。研究结果表明:在研究时段内,Ⅱ2采区的地表下沉盆地处于下沉活跃期,在Ⅱ1021工作面和1021工作面西北侧形成了2个沉降中心,二者的最终累积最大下沉量分别为185 mm和169 mm;受注浆充填的影响,采区地表下沉速率、下沉量以及下沉范围均显著减小,并且下沉盆地表现出明显的非对称性。剔除3个相位失相干点后的均方根误差RMSE为19.7 mm(决定系数R2=0.910 4,p<0.001)。这说明注浆充填可以有效减缓矿区地表沉降,并且TSS-DInSAR方法可作为一种切实可靠、性价比高的矿区地表沉降监控分析新手段。

Abstract: The time series subsidence velocity and cumulative subsidence information were obtained by the time series stacking DInSAR(TSS-DInSAR) of two-pass method in the Ⅱ2 mining area with partially grouting filling of Linhuan coalmine of Huaibei Mining Group from 2016-11-21 to 2017-02-25. Subsequently, the dynamic subsidence laws of the area surface were analyzed based on the monitoring results. At last, the accuracy verification and regression analysis were carried out by means of the measured leveling data. The results show that the surface subsidence basin is in the active period of sinking during the study period, and two subsidence centers are formed on the Ⅱ1021 working face and the northwest side of the 1021 working face. The finally cumulative maximum subsidence values of the two subsidence value centers are 185 mm and 169 mm, respectively. Affected by the grouting filling, the subsidence velocity, subsidence and subsidence range of the mining area surface decrease significantly and the subsidence basin is obviously asymmetric. The RMSE is 19.7 mm (R2=0.910 4, p<0.001) after three phase decoherence points are removed. The effect of reducing subsidence by grouting is remarkable, and the TSS-DInSAR can provide a reliable and cost-effective method to monitor and analyze surface subsidence in mining area.

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