阶段嗣后充填法采场应力与变形规律及稳定性研究

某铁矿采用阶段空场嗣后充填法开采，目前-450 m首采中段的回采工作即将结束，拟在-390 m新中段的开拓中将阶段高度从原来的60 m提高到90 m，阶段高度提高了50%。为了研究急倾斜厚大矿体在阶段 空场嗣后充填法开采条件下的应力变形规律，采用相似材料试验和数值模拟相结合的方法，考虑了首采中段和多盘区对新中段回采充填的影响，通过分析得到了采场矿柱和围岩的应力与变形规律。结果表明：在阶段 高度提升后的新中段回采充填过程中，矿柱被揭露后矿柱内的应力会大幅增加，并随应力集中程度增加而导致矿柱的剪切破坏；采场内最大变形出现在中间盘区矿房顶板，最大主应力及塑性区主要出现在中间矿柱的 中下位置，最大主应力、沉降变形及塑性区呈中间大两边小的对称性分布，最小主应力出现在两边矿房顶角处；盘区矿房采用间隔回采形成的最小主应力和沉降变形小于顺序开采，矿房的回采顺序对最大主应力的影 响较小；随着矿柱宽度增加，采场内最大最小主应力、变形值及塑性区范围呈逐渐减小的趋势。研究成果对国内外采用空场嗣后充填法开采的同类型矿山具有借鉴意义。

Study on Stope Stress and Deformation Law and Stability of Stage and Subsequent Filling Method

A certain iron mine adopts the stage open stope and subsequent filling method. At present， the stoping work of the first mining middle section of -450 m is about to end. It is planned to increase the stage height from the original 60 m to 90 m in the development of the new middle section of -390 m， and the stage height is increased by 50%. In order to study the stress and deformation law of steeply inclined thick ore body under the condition of stage open stope and subsequent filling mining， this paper adopts the method of combining similar material test and numerical simulation， considers the influence of the first mining middle section and multi panel area on the new middle section mining and filling， and obtains the stress and deformation law of stope pillar and surrounding rock through analysis.The results show that: in the process of mining and filling in the new middle section after the stage height is raised， the stress in the pillar will increase greatly after the pillar is exposed， and the shear failure of the pillar will be caused with the increase of stress concentration； The maximum deformation in the stope appears in the roof of the room in the middle panel， the maximum principal stress and plastic zone appear in the middle and lower position of the middle pillar， the maximum principal stress， settlement deformation and plastic zone are symmetrically distributed with large in the middle and small on both sides， and the minimum principal stress appears at the top corner of the room on both sides； The minimum principal stress and settlement deformation caused by interval mining are less than those caused by sequential mining， while the mining sequence of chamber has little effect on the maximum principal stress； With the increase of pillar width， the maximum and minimum principal stress， deformation value and plastic zone range in stope decrease gradually. The research results of this paper can be used for reference for similar mines at home and abroad.