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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第9期    总第289期    2018年9月

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文章编号:1672-7207(2018)09-2316-07
阶段嗣后胶结充填体矿柱强度模型研究与应用
杨磊1, 2,邱景平1,孙晓刚1,邢军1

(1. 东北大学 资源与土木工程学院,辽宁 沈阳,110819;
2. 皇家墨尔本理工大学 工程学院,澳大利亚 墨尔本,3000
)

摘 要: 利用滑楔体极限平衡理论,建立胶结充填体矿柱侧向滑移失稳模型,考虑采场结构参数、充填材料自身特性和充填体-矿岩(柱)接触面特性的影响,分别得出胶结充填体矿柱与矿壁和非胶结充填体矿柱接触时所需强度模型。以中关铁矿为工程分析实例,开展室内充填配比试验。研究结果表明:当胶结充填体矿柱后壁与矿壁和非胶结充填体矿柱接触时,胶结充填体矿柱所需强度随阶段高度的增加分别呈对数函数和线性函数增长;中关铁矿胶结充填体矿柱所需强度为0.78~0.82 MPa,经典强度设计模型计算值偏小,需选取安全系数为1.5~3.0;推荐中关铁矿使用的充填配比为灰砂比1:10、料浆质量分数70%,抗压强度、泌水率、塌落度和流动度均能满足采矿作业需求,水泥用量与原推荐方案相比可降低45.7%。

 

关键词: 阶段嗣后充填采矿法;胶结充填体矿柱;强度模型;全尾砂;充填配比

Research and application on strength model of cemented backfill pillar for stage subsequent filling mining method
YANG Lei1, 2, QIU Jingping1, SUN Xiaogang1, XING Jun1

1. School of Resources and Civil Engineering, Northeastern University, Shenyang 110819 China;
2. School of Engineering, RMIT University, Melbourne, VIC 3000, Australia

Abstract:Limit equilibrium theory of sliding wedge was used to build a lateral sliding destabilization model of cemented backfill pillar (CBP). And the required strength models of CBP in contact with the wall and the uncemented backfill pillar were established respectively, considering stope structure parameters, characteristics of backfill and contacts properties of backfill-pillar. Then taking Zhongguan Iron Mine as the engineering example, the experiments on cemented tailings backfill were conducted in laboratory. The results show that the required strength of CBP in contact with non-cemented backfill increases linearly with higher stope height, while logarithmically in contact with orebody. The required strengths of CBP in Zhongguan Iron Mine is in the range from 0.78 MPa to 0.82 MPa. The strength designed by the traditional strength models should be multiplied by a factor of safety from 1.5 to 3.0 as the calculation results are relatively smaller. Cemented tailings backfill with 1:10 cement-to-tailings ratio and 70% solid mass fraction is recommended for Zhongguan Iron Mine, as its strength, bleeding rate, collapsed slump, and fluidity can meet the requirements of mining operation. The consumption of cement can reduce by 45.7% compared with previous recommended backfilling ratio.

 

Key words: stage subsequent filling mining; cemented backfill pillar; strength model; unclassified tailings; filling blending ratio

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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