摘要
承压水体上采煤的关键问题在于底板突水机理的分析与预测.当底板关键层受采动影响而发生破断后其是否导致突水,基本的落脚点在于破断后的底板关键层是否将发生回转失稳.基于此,通过对采动底板关键层破断后呈现的形式分析,以无断层的底板关键层为研究对象,将工作面中部底板简化为三铰拱形式,在对三铰拱力学分析的基础上导出三铰拱的极限平衡关系;基于三铰拱极限平衡状态被破坏后工作面中部底板关键层发生回转失稳的力学机理,建立了无断层的底板关键层发生回转失稳的条件,并由此得到无断层底板关键层的失稳判据.
The key question is floor water inrush analysis and forecasting on coal mining above a confining aquifer.The basic end result is the key stratum occurring unstable if the key stratum of floor is broken by impact of mining and leading to water inrush.Based on this,the paper analyzes the form of the key stratum broken and simplifies the central pressed floor of face as the form of three-hinged arch with study of the key stratum without faultage.Building the limit equilibrium relationship of three-hinged arch based on the mechanical analysis and established condition occurs rotary destabilizing conditions and the resultant destabilizing criterion on the base of mechanical analysis on three-hinged arch.
出处
《矿业工程研究》
2010年第2期37-39,共3页
Mineral Engineering Research
关键词
底板关键层
力学分析
失稳条件
失稳判据
key stratum of pressed floor
mechanics analysis
destabilizing condition
destabilizing criterion
