采矿与岩层控制工程学报2025，Vol.7Issue(4)：54-74,21.DOI:10.13532/j.jmsce.cn10-1638/td.2024-1423
房式采空区煤柱群-顶板系统链式失稳机制及评价方法
Chain instability mechanism and evaluation method of coal pillars-roof system in room and pillar mining goaf
摘要
Abstract
To evaluate the stability of the residual coal pillars-roof system in room and pillar mining goaf,a three-dimensional thin platemechanical model of elastic foundation for the system was established considering the difference in the interaction relationship between coal pillars and roof at different positions.The chain instability mechanism of this system was revealed from the three-dimensional spatial structure perspective,and the influence of coal pillar spalling under time effect was considered.An evaluation method for the chain instability of this system was established.The results show that the load borne by a single coal pillar at different positions and the remaining coal pillars stability and roof deflection response characteristics caused by its instability are different.The deflection of the four-side fixed roof is smaller than that of the four-side simply supported roof under the same coal pillars conditions.After the instability of a certain coal pillar,the load increase of the remaining coal pillars during the four-side fixed roof is greater than that of the four-side simply supported roof.The spalling of coal pillars over time leads to a gradual decrease in their effective bearing size and bearing capacity,indicating the signicance of considering the coal pillar spalling due to time effect.Simplifying the roof into a thin plate and applying the energy variational method can obtain its approximate bending solution,thereby optimizing the roof fracture criterion with smaller errors.The chain instability of coal pillars-roof system is a dynamic process of"overall stability-local instability-instability diffusion-overall instability".By integrating a modified single coal pillar instability criterion and an optimized roof fracture criterion,the developed dynamic evaluation method can effectively evaluate the chain stability of coal pillars-roof system.关键词
房式采空区/煤柱群-顶板系统/链式失稳/时间效应/评价方法Key words
room and pillar mining goaf/coal pillars-roof system/chain instability/time effect/evaluation method分类
矿业与冶金引用本文复制引用
李敬凯,王志强,李青海,马晓川,杨长德,刘玉达,代博元..房式采空区煤柱群-顶板系统链式失稳机制及评价方法[J].采矿与岩层控制工程学报,2025,7(4):54-74,21.基金项目
国家自然科学基金资助项目(52074291,52274218,52364021) （52074291,52274218,52364021）
新疆煤炭资源绿色开采教育部重点实验室自主课题资助项目(KLXGY-Z2503) （KLXGY-Z2503）
自治区高校基本科研业务费科研资助项目(XJEDU2025J140) （XJEDU2025J140）
自治区天池英才引进计划青年博士计划资助项目(2025XGYTCYC08) （2025XGYTCYC08）
新疆工程学院博士科研启动基金资助项目(2025XGYBQJ09) （2025XGYBQJ09）
