大冶铁矿嗣后充填采场围岩变形机理研究

摘要

以相似材料模拟实验技术为主要研究手段,借助全站仪、应变计和数码相机等仪器监测了模型围岩的变形、应力以及破坏情况,研究了不同结构参数条件下分段空场嗣后充填采场的围岩变形与应力变化特征,以及发生破坏时的规律与特征.主要研究结果为:揭示了大冶铁矿合理的采场结构参数；采场顶板与矿柱所受应力分布为拉剪应力和压应力；顶板是采场稳定的关键因素,应保证充填体与顶板良好的接触关系,提高接顶率；采场内应力分布规律与回采方向相反,偏向于首采矿块.%Taken the similar material simulation techniques as the main research tools,the law of rock deformation,stress and damage effects of different structural parameters of under sublevel mining subsequent Tilling was studied with the total station,strain gauges and digital cameras. The law of roof damage was also mentioned. The major results are: the Daye iron ore stopes reasonable structural parameters were revealed; the stress in the roof is shear stress,which in the pillar is compressive stress; roof stability is the key factor for the stope,which should ensure the contaction between the roof and filling body after filling the goaf; the caraetor of the stope stress distribution is contrary to the direction of mining,which is lean to the first raining ore block.