【作者】 周杰；

【导师】 池秀文；

【作者基本信息】 武汉理工大学 ， 矿业工程， 2016， 硕士

【摘要】 充填条带矿柱的稳定性对于矿山安全的生产有着重要意义,充填条带矿柱的塑性区宽度和两侧采空区宽度对充填条带矿柱的稳定性有着重大的影响。由于挑水河磷矿地处山区,充填材料运输成本较高,因此采用部分尾矿胶结充填条带置换采矿法,采场充填比例要求小于0.5。本文根据挑水河磷矿实际情况,通过理论计算、数值模拟的方法分析条带矿柱的塑性区宽度、核区宽度、留空区宽度和采场顶板下沉量,为选择合适的充填材料灰砂比、充填宽度和留空区宽度提供指导意见。主要成果如下:（1）在考虑中间主应力和矿柱自重的影响下,根据DP系列屈服准则和条带矿柱极限强度,推导极限状态下条带矿柱单侧塑性区宽度公式。根据理论计算和数值模拟结果,选择DP3屈服准则相比MC屈服准则更为保守,用于实际生产更为安全。（2）根据条带矿柱核区顶部支撑应力变化近似二次曲线和塑性区应力变化曲线为直线的假设,建立了核区中心应力与条带矿柱极限强度之间的关系,运用应力平衡原理,建立了极限状态下条带矿柱宽度与两侧采空区宽度之间的关系式。（3）采场顶板下沉的顺序为:Ph₂磷矿矿柱压缩→采场承重岩层第一次压缩→充填条带矿柱压缩→采场承重岩层第二次压缩,随着条带的逐渐开采,采场上覆岩层最终形成一种波浪形的下沉曲线。因此首先运用关键层理论判断上覆岩层中的关键岩层,然后运用承重岩层压缩量计算公式和条带矿柱压缩量计算公式分析采场顶板的下沉量。（4）根据条带矿柱塑性区宽度、核区宽度和留空区宽度之间的理论公式,对比数值模拟结果,选择充填材料灰砂比为1:5,充填条带宽度为14m,留空区宽度为14m。此时采场顶板最终下沉量为92.3mm,能够同时满足安全生产和节省充填材料的要求。更多还原

【Abstract】 Stability of filling strip pillar had great influence in safety in mining,plastic zone width and gob width of filling strip pillar was closely related to its stability.Because Tiaoshuihe phosphate mine was located in a mountain area,the cost of filling materials was high,part tailing strips displacement filling mining method was chosen,the ratio between filling areas and mining areas was required to be less than 0.5.In order to choose suitable filling material,filling width and gob width,this paper would research plastic zone width,core zone width,gob width and roof subsidence through theoretical calculations and numerical analysis.Those were the major results:（1）Considering intermediate principal stress and pillar weight,sided pillar plastic zone width formula under limited state was derived by DP yield criteria and striped pillar ultimate strength.According to theoretical calculations and numerical analysis,DP3 criteria was more conservation than MC criteria,which means it was safer in practice（2）Because stress changes on the top of pillar core zone was approximate to quadratic curve hypothesis and the plastic zone stress curve was a straight line,the relation between core central stress and the pillar ultimate strength was gotten.then the formula between pillar width and gob width on both sides was derived based on stress balance principle.（3）The order of roof sinking was:Ph₂ phosphate pillar compression→bearing strata first compression→filling strip pillar compression→bearing strata second compression,with the development of strip mining,overburden subsidence ultimately form a wave-shaped curve.So the key strata theory was used to judge key strata,then the roof subsidence was calculated through bearing rock compression and striped pillar compression theory.（4）Compared to numerical analysis,according to the theoretical formula between plastic zone width,core zone width and gob width,the best lime-sand ratio is1:5,filling pillar width is 14m,gob width is 14m,then the roof subsidence is 92.3mm,which could ensure mining safety and save filling material.更多还原