Investigation of ground subsidence response to an unconventional longwall panel layout

IF 6.9 1区 工程技术 Q2 ENERGY & FUELS International Journal of Coal Science & Technology Pub Date : 2024-08-06 DOI:10.1007/s40789-024-00719-4
Pengfei Wang, Zhuang Zhu, Linfeng Guo, Huixian Wang, Yue Qu, Yaoxiong Zhang, Linwei Wang, Hua Wang
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Abstract

Ground subsidence caused by extraction of longwall panels has always been a great concern all over the world. Conventional longwall mining system (CLMS) gives rise to wavy subsidence causing great damage to surface structures. A coal mine in Shanxi, China, utilizes a split-level longwall layout (SLL) for a sub-horizontal No. 8 coal seam to improve the cavability of mudstone interlayer and top coal. This layout, however, also produced unexpectedly favorable surface subsidence. Subsidence of No. 6 and No. 8 longwall panels was monitored while mining was conducted. Field instrumentation and numerical simulation were carried out. It is demonstrated that an asymmetric subsidence profile with stepped subsidence and cracks occurred on the tailgate side but relatively mild and smooth deformation on the other. Due to elimination of conventional parallelepiped gate pillar, No. 6 and No. 8 gobs were connected. Extraction of two SLL panels acted as one supercritical panel. The maximum possible subsidence was reached which lowers the likelihood of potential future secondary subsidence as underground gob fractures and voids have closed. Therefore, SLL is more favorable for post-mining land reuse as gobs are more consolidated underground.

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非常规长壁面板布局的地面沉降响应研究
长壁开采造成的地面沉降一直是全世界都非常关注的问题。传统的长壁开采系统(CLMS)会产生波浪形沉降,对地表结构造成巨大破坏。中国山西的一个煤矿在 8 号煤层采用了分层长壁布置(SLL),以改善泥岩夹层和顶煤的可采性。然而,这种布局也产生了意想不到的地表下沉。在开采过程中,对 6 号和 8 号长壁面板的下沉进行了监测。进行了现场仪器测量和数值模拟。结果表明,不对称下沉剖面在尾板一侧出现了阶梯状下沉和裂缝,而在另一侧则出现了相对温和、平滑的变形。由于取消了传统的平行管状闸门支柱,6 号和 8 号闸门被连接起来。两个 SLL 面板的抽取就像一个超临界面板。由于地下岩块裂缝和空隙已经闭合,因此达到了最大可能的下沉量,降低了未来可能出现的二次下沉的可能性。因此,SLL 更有利于开采后的土地再利用,因为地下岩块更加坚固。
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来源期刊
CiteScore
11.40
自引率
8.40%
发文量
678
审稿时长
12 weeks
期刊介绍: The International Journal of Coal Science & Technology is a peer-reviewed open access journal that focuses on key topics of coal scientific research and mining development. It serves as a forum for scientists to present research findings and discuss challenging issues in the field. The journal covers a range of topics including coal geology, geochemistry, geophysics, mineralogy, and petrology. It also covers coal mining theory, technology, and engineering, as well as coal processing, utilization, and conversion. Additionally, the journal explores coal mining environment and reclamation, along with related aspects. The International Journal of Coal Science & Technology is published with China Coal Society, who also cover the publication costs. This means that authors do not need to pay an article-processing charge.
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