Investigation of ground subsidence response to an unconventional longwall panel layout

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外文摘要：Ground subsidence caused by extraction of longwall panels has always been a great concern all over the world.Conven-tional 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 subsid-ence.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 subsid-ence 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.

外文关键词：

Ground subsidenceLongwall miningSplit-levelMudstone interlayerGreen mining

作者：

Pengfei Wang、Zhuang Zhu、Linfeng Guo、Huixian Wang、Yue Qu、Yaoxiong Zhang、Linwei Wang、Hua Wang

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作者单位：

College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China

China National Coal Association,Beijing 100013,China

Inner Mongolia Zhengchuang Technology Co.,Ltd,Alxa League,China

Ordos Rrban Construction Investment Group Co.,Ltd,Alxa League,China

Inner Mongol Zhongtai Energy Co.,Ltd,Alxa League,China

Ordos Energy Bureau,Alxa League,China

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出版年：

2024

DOI：

10.1007/s40789-024-00719-4

国际煤炭科学技术学报(英文)

CSTPCD

ISSN：2095-8293

年,卷(期)：2024.11(5)