Investigation of ground subsidence response to an unconventional longwall panel layout
Pengfei Wang1
Zhuang Zhu1
Linfeng Guo2
Huixian Wang1
Yue Qu3
Yaoxiong Zhang4
Linwei Wang5
Hua Wang6
1.College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China2.China National Coal Association,Beijing 100013,China3.Inner Mongolia Zhengchuang Technology Co.,Ltd,Alxa League,China4.Ordos Rrban Construction Investment Group Co.,Ltd,Alxa League,China5.Inner Mongol Zhongtai Energy Co.,Ltd,Alxa League,China6.Ordos Energy Bureau,Alxa League,China
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.
机标关键词：panellayoutgroundinvestigationlongwallresponsesubsidenceunconventional
论文发表日期：2024-10-28
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：17( 90-106 )
英文信息