金属矿山充填体强度分布规律实验研究

发布时间：2018-01-11 17:33

本文关键词：金属矿山充填体强度分布规律实验研究　出处：《金属矿山》2016年04期 　论文类型：期刊论文

【摘要】：西藏甲玛铜多金属矿二期工程首采地段采用充填采矿法进行开采。由于在充填过程中充填料浆的离析分层等原因致使形成的原位充填体具有不均匀性,其强度与实验室充填体标准试块的强度也有很大差异。通过建立大比例尺三维立体仿真物理模拟实验系统,研究采场内充填体强度的分布规律。结果表明:在水平方向上充填体强度随料浆流动方向上呈先增大后减小的趋势,高灰砂比的充填体强度波动程度较小,且在下料口位置附近充填体强度与标准充填体试块强度相当;在竖直方向上充填体强度随深度的增大而增大,且高灰砂比的充填体强度增幅较大。通过对充填体样本进行电子扫描显微镜实验观察其微观结构,从本质上解释不同位置充填体强度差异的原因。
[Abstract]:The filling mining method is used in the first mining section of the second phase project of Jiama Copper Polymetallic Mine, Tibet. The in-situ filling body formed by the separation and stratification of the filling slurry during the filling process is non-uniform. Its strength is also very different from the strength of the standard specimen of the laboratory filling body. The physical simulation experiment system of large scale three-dimensional simulation is established. The distribution of backfill strength in the mining field is studied. The results show that the strength of the backfill increases first and then decreases with the slurry flow direction in the horizontal direction, and the intensity fluctuation degree of the backfill body with high lime-sand ratio is small. And the strength of the filling body near the material outlet is equal to the strength of the standard filling body. In the vertical direction, the strength of the filling body increases with the increase of depth, and the strength of the filling body with high lime-sand ratio increases greatly. The microstructure of the filling body sample is observed by scanning electron microscope (SEM). In essence, the reasons for the difference in the strength of the filling body in different positions are explained.
【作者单位】：华北理工大学矿业工程学院;河北省矿业开发与安全技术实验室;西藏华泰龙矿业开发有限公司;
【基金】：河北省高等学校科学技术研究项目(编号:ZD2015020)
【分类号】：TD853.34
【正文快照】： 充填开采时采场充填体强度的可靠性是影响采充平衡和开采安全的重要因素。在进行充填设计时,多数情况下是通过充填体标准试块实验来进行采场充填设计[1-3],然而,在充填采场内充填料浆在流动过程中会产生沉降分层现象,使充填体强度产生各向异性[4],影响接顶率,充填体标准试块强

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