Investigation of ground subsidence response to an unconventional longwall panel layout  

作　　者：Pengfei Wang Zhuang Zhu Linfeng Guo Huixian Wang Yue Qu Yaoxiong Zhang Linwei Wang Hua Wang 

机构地区：[1]College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China [2]China National Coal Association,Beijing 100013,China [3]Inner Mongolia Zhengchuang Technology Co.,Ltd,Alxa League,China [4]Ordos Rrban Construction Investment Group Co.,Ltd,Alxa League,China [5]Inner Mongol Zhongtai Energy Co.,Ltd,Alxa League,China [6]Ordos Energy Bureau,Alxa League,China

出　　处：《International Journal of Coal Science & Technology》2024年第5期90-106,共17页国际煤炭科学技术学报(英文)

基　　金：This study was funded by the General Program of the National Natural Science Foundation of China(52274092);Hu-Bao-E National Independent Innovation Demonstration Zone Construction Science and Technology Support Project(2023XM08);Funds for Talents Supported by the China Association for Science and Technol-0gy(YESS20200211).

摘　　要：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 postmining land reuse as gobs are more consolidated underground.

关 键 词：Ground subsidence Longwall mining Split-level Mudstone interlayer Green mining 

分 类 号：TD325[矿业工程—矿井建设]