拱效应对狭窄型充填采场内应力分布状态的影响

发布时间：2018-06-20 23:23

本文选题：充填采矿法 + 狭窄型　；参考：《金属矿山》2017年01期

【摘要】：利用FLAC研究了拱效应对狭窄型采场内充填体垂直应力的降低比率,对比了不同内摩擦角下充填体内的拱效应及水平应力的转化率,讨论了回填次数对充填体应力分布状态的影响。结果表明:拱效应的存在使充填体内的垂直应力随着深度的增加而逐渐趋于稳定,采场底板处的垂直应力仅为其上覆充填体自重的42.26%;充填体内摩擦角分别为15°、30°和45°时,对应的水平应力转化率分别为51.55%、57.74%和69.07%;回填次数对充填体内的拱效应及应力分布状态影响甚微。狭窄型采场内的充填体强度设计应考虑拱效应对垂直应力的转化作用,从而降低相关技术经济指标。
[Abstract]:The ratio of arch effect to the vertical stress in the filling body in a narrow stope is studied by FLAC, and the arch effect and the transformation rate of horizontal stress are compared under different internal friction angles. The influence of the number of backfilling times on the stress distribution in the filling body is discussed. The results show that the vertical stress in the filling body is with the depth of the filling body with the depth of the body. The vertical stress at the bottom of the stope is only 42.26% of the self weight of the overlying filling body, and the corresponding horizontal stress conversion rate is 51.55%, 57.74% and 69.07% respectively when the friction angle of the filling body is 15, 30 and 45, respectively, and the backfilling times have little influence on the arch effect and stress distribution in the filling body. The conversion of arch effect to vertical stress should be taken into account in the design of backfill strength in stope, so as to reduce related technical and economic indexes.
【作者单位】：鞍钢矿业爆破有限公司;东北大学资源与土木工程学院;
【基金】：“十二五”国家科技支撑计划项目(编号:2015BAB15B01)
【分类号】：TD853.34

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