摘要
运用数值模拟分析方法,研究煤柱支承压力在底板的分布规律。研究结果表明,煤柱底板的应力分布具有明显的非均匀分布特征,应力集中程度最高地方在煤柱下,向采空区发展则应力集中程度迅速降低;分析非均匀荷载状态下巷道易于变形和破坏的原因,得出在非均匀的荷载作用下,巷道支护体结构更易出现局部过载,产生局部破坏,最终可能导致支护体结构失稳。指出在布置下部煤层回采巷道中,除避开煤柱支承压力增高区外,还应考虑煤柱下底板应力分布状态非均匀性的影响,应力分布状态的非均匀分布特征可用应力改变率衡量。提出采用应力改变率确定极近距离下部煤层回采巷道的合理位置方法,并通过现场实践证明该方法可行。研究结果对类似条件下巷道合理布置具有一定指导意义。
With numerical simulation method,the distribution law of coal pillar support pressure in the floor was studied.The result shows that stress distribution of floor under coal pillar has obvious heterogeneous characteristic in that the highest stress concentration lies under coal pillar and concentration degree decreases quickly away from coal pillar.The reason that roadways were easy to transform and fail under heterogeneous load was analyzed.Under the heterogeneous load,the roadway support structure is subjected to emergent partial overload and produces local failure and will lose its stability.It is pointed out that the influence of the heterogeneity of stress distribution on the bottom plate under the coal pillar should be considered when laying the roadway of ultra-close lower-seams besides avoiding the coal pillar abutment stress concentration area.The heterogeneous degree can be measured by the rates of stress variation.In-situ observation confirmed the method,which indicates that the proposed methods are feasible to the study of reasonable position of the roadway for ultra-close lower-seams.The results have references to the layout of roadway with similar conditions.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2008年第1期97-101,共5页
Chinese Journal of Rock Mechanics and Engineering
关键词
采矿工程
极近距离煤层
数值模拟
应力状态
巷道布置
mining engineering
ultra-close multi-seam
numerical simulation
stress state
layout of roadway
