Study on the disaster caused by the linkage failure of the residual coal pillar and rock stratum during multiple coal seam mining:mechanism of progressive and dynamic failure
Yunliang Tan1
Qing Ma2
Xiaoli Liu3
Xuesheng Liu1
Derek Elsworth4
Ruipeng Qian3
Junlong Shang5
1.College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao 266590,China2.College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao 266590,China;State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China3.State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China4.Department of Energy and Mineral Engineering,G3 Center and Energy Institute,The Pennsylvania State University,University Park,PA 16803,USA5.James Watt School of Engineering,University of Glasgow,Glasgow G128QQ,UK
摘要：Multi-seam mining often leads to the retention of a significant number of coal pillars for purposes such as protection,safety,or water isolation.However,stress concentration beneath these residual coal pillars can significantly impact their strength and stability when mining below them,potentially leading to hydraulic support failure,surface subsidence,and rock bursting.To address this issue,the linkage between the failure and instability of residual coal pillars and rock strata during multi-seam mining is examined in this study.Key controls include residual pillar spalling,safety factor(fs),local mine stiffness(LMS),and the post-peak stiffness(kc)of the residual coal pillar.Limits separating the two forms of failure,progressive versus dynamic,are defined.Progressive failure results at lower stresses when the coal pillar transitions from indefinitely stable(fs＞1.5)to failing(fs＜1.5)when the coal pillar can no longer remain stable for an extended duration,whereas sud-den(unstable)failure results when the strength of the pillar is further degraded and fails.The transition in mode of failure is defined by the LMS/kc ratio.Failure transitions from quiescent to dynamic as LMS/kc＜1,which can cause chain pillar instability propagating throughout the mine.This study provides theoretical guidance to define this limit to instability of residual coal pillars for multi-seam mining in similar mines.
机标关键词：mechanismdisasterdynamicstudyrockseamcausedcoal
论文发表日期：2023-06-28
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：14( 122-135 )
英文信息