关键词: 钒矿, 应力迁移, 多层矿体, 重叠关系, 矿层间距

Abstract: Aiming at the problems of overlapping distribution of multi-layer orebodies,repeated disturbance of adjacent mining layers and complex stress distribution of surrounding rock,etc. ,theoretical analysis and numerical simulation methods are used to establish a plane model of surrounding rock stress distribution in the rectangular goaf of single-layer orebodies,and combine the numerical simulation results to fit the relationship equation between the change rate of the vertical stress peak in surrounding rock in the goaf of single-layer mine and its span,and analyze the characteristics of superposition of surrounding rock stress in multiple stopes of single-layer mine. On this basis,the type of relative position relationship of the goaf during the mining of double-layer orebody is defined,and the influencing pattern of different span and vertical distance of the goaf of double-layer mine on the characteristics of its surrounding rock stress distribution is studied. The study results show that there are four typical distribution characteristics of stress release,stress drop,stress increase and original stress in the surrounding rocks of the vanadium orebody,the larger the span of the extraction zone,the higher the stress peak,and the stress change rate in the deep surrounding rocks of the stress increase zone decreases with increasing distance from the stress peak point according to the power function relationship,and the stress change rate in the stress drop zone increases with increasing distance from the stress peak point. The stress increase zones in adjacent goafs will be superimposed in the column between them,and the stress change rate at a point in the column is the sum of the stress change rates caused by the goafs on both sides at that point. When the stress release zone in the lower goaf overlaps with the stress increase zone in the upper goaf,it will result in higher tensile stresses in the surrounding rock,and when the stress release zone in the upper goaf overlaps with either area in the lower goaf,it will result in lower compressive stresses. Significant stress changes at the intersection of the overlapping and non-overlapping areas of the upper and lower goafs. According to the stress migration patterns of multi-layer orebody mining,the strong and weak disturbance distance of the goaf is proposed,and the strongly disturbed area,weakly disturbed area and undisturbed area are divided to provide reference for determing reasonable recovery parameters and recovery sequence of multi-layer orebody mining.