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Visualization analysis of potential fracture in overburden strata induced by longwall coal mining
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-17 , DOI: 10.1016/j.tust.2025.106373
He Ren, Yishan Pan, Yimin Song, Hao Luo

The condition of overburden strata is a key problem relative to the safety of underground mining activities. However, the invisibility of it poses significant difficulties for on-site monitoring. Accordingly, a multi-indicator visualization analysis method for strata fracture was proposed in this study. Deformation localization features of overburden strata were visualized from the perspective of energy release. Taking high-pressure events in mining face as a clue, combined with seismic energy, frequency and other indicators, the potential fracture and its development process were analyzed. The following results were obtained: (1) The clustering of seismic events dynamically progresses with the advance of mining. Significant differences in seismic clustering features were observed during mining, which reflects the influences of nearby goaf, changes in strata structure, specific geological structures, and self-fracture. (2) Before high-pressure events occurs, seismic events tended to cluster in a certain zone, exhibiting significantly higher frequency and energy compared with the other zones. Through incremental analysis, the potential strata fractures that cause high-pressure events can be identified. (3) The development of strata fracture not only progresses along the mining direction, but also in the vertical direction relative to the mining. In the initial stage, the fracture region was concentrated behind the mining face and on the side of goaf. As mining progressed, influenced by structural damage, the fracture region gradually shifted towards the front of the mining face and extended towards the coal seam side. (4) In the early stage of mining, fracture primarily occurs in the low-lying strata. In the mined-out area, the suspended section of the lower-level strata experienced fixed beam fractures initially, gradually shifting the fracture layer upwards. Simultaneously, in front of the mining face, the fractured strata became cantilever beam structures, leading to periodic fractures occurring ahead of the mining face.

中文翻译:


长壁采煤诱发的覆盖层潜在裂缝可视化分析



覆盖层的状况是关系到地下采矿活动安全的关键问题。然而,它的不可见性给现场监测带来了很大的困难。因此,本研究提出了一种地层裂缝多指标可视化分析方法。从能量释放的角度可视化了覆盖层的变形局部特征。以采矿工作面的高压事件为线索,结合地震能量、地震频率等指标,分析了潜在裂缝及其发展过程。结果表明:(1)地震事件的聚类性随着采矿的推进而动态地进行。在采矿过程中观察到地震聚集特征的显著差异,反映了附近采空区、地层结构变化、特定地质结构和自断裂的影响。(2) 在高压事件发生之前,地震事件往往聚集在某个区域,与其他区域相比,地震事件表现出明显更高的频率和能量。通过增量分析,可以识别导致高压事件的潜在地层裂缝。(3)地层裂缝的发育不仅沿采矿方向进行,而且相对于采矿在垂直方向上也发生。初期,裂缝区集中在采空区后方和采空区侧面。随着开采的进行,受结构损伤的影响,裂缝区逐渐向采掘工作面前部移动,并向煤层侧延伸。(4) 在采矿初期,裂缝主要发生在低洼地层。 在采空区,较低级别地层的悬空部分最初经历了固定梁裂缝,然后逐渐向上移动裂缝层。同时,在采矿工作面前面,裂隙地层成为悬臂梁结构,导致采矿工作面前方发生周期性裂缝。
更新日期:2025-01-17
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