金属矿山采空区群形成过程中围岩扰动规律研究

Study of disturbance law for wall rock while goaf group formation in metal mines

以石人沟铁矿为工程背景,选取典型矿段,采用相似材料模型试验和数值模拟计算相结合的方法,对该区域内采空区群形成过程中围岩的应力应变的演变规律进行研究。首先,利用相似材料试验,对采空区顶板的应力和位移以及矿柱的应力演变规律进行系统分析。然后,用数值模拟软件,对采空区群形成过程中开采对围岩的扰动范围进行系统研究。研究结果表明,在采空区群形成过程中,围岩应力-应变演变规律与采空区单独开采差异较大,每个采空区的围岩应力应变始终处于动态变化中,尤其是处于群区域中间部位的采空区,该处围岩的应力-应变状态也是最差的。群区域中,由开采对围岩造成的扰动较单独开采时急剧增大,且最终的影响范围并不是单独开采的简单相加,说明在区域内形成一种采空区的"群效应",加剧采空区的危险程度。

Based on the engineering background of Shirengou iron mine,the evolution law of stress and strain of wall rock during formation process of goaf group in a typical ore blocks using similar material physical models and numerical simulation was researched.Firstly systematic analysis was made on evolution law of roof's stresses and displacements and pillar's stresses through the similarity material test.Secondly the disturbance range of wall-rock in the formation process of goaf group was systematically studyed using numerical simulation software.The results indicate that the evolution law of stresses and strains are great difference among goaf group and single exploitation.During the formation process,the stresses and strains of wall-rock are in dynamic development especially in the middle region of goaf group where the state of stresses and strains are worst.The disturbance to the wall-rock caused by mining in group region increases rapidly and the final disturbance range is not simple addition of which caused by mining single goaf.It is indicated that there is some 'group effect' in the region that enhances the hazard grade of goaf.