Strength characteristics of mixed aggregate cemented backfill and reasonable matching with excavated ore body

被引：0
|
作者：
Hou Y.-Q. [1 ,2 ]
Yin S.-H. [1 ,2 ]
Yang S.-X. [1 ,2 ]
Zhang M.-Z. [1 ,2 ]
Cao Y. [1 ,2 ]
机构：
[1] School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing
[2] Key Laboratory of High-Efficient Mining and Safety of Metal Mines, Ministry of Education, Beijing
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2021年 / 31卷 / 12期
基金：
中国国家自然科学基金;
关键词：
Curing time; Energy matching analysis; Filling body; Microstructure; Slump; Strength growth law;
D O I：
10.11817/j.ysxb.1004.0609.2021-37637
中图分类号：
学科分类号：
摘要：
In order to study the strength characteristics of mixed aggregate cemented backfill and the reasonable matching with excavated ore bodies, a single factor multi-level experimental design method was used to study the mixing ratio of mixed aggregate cemented backfill. The effects of mass concentration and waste rock content on the slump and solidification strength of mixed aggregate filler were discussed, the solidification strength growth model was established and the effect of waste rock content on the microstructure and properties of mixed aggregate cemented backfill was studied by SEM. Combined with the energy dissipation principle, the energy matching coefficient K was introduced to analyze the reasonable matching between the filling body and the excavated ore body, and the reasonable curing time of the mixed aggregate cemented backfill as the artificial false roof in the stope was quantitatively analyzed. The results show that the slump of filling slurry decreases linearly with the increase of mass concentration, and increases exponentially with the increase of waste rock content. Within 56 d of curing age, the compressive strength of the composite aggregate cemented backfill under different mass concentrations and waste rock contents follows the exponential function growth law. The microscopic test results show that the range of waste rock content can significantly affect the compactness of the microstructure inside the backfilling, which in turn affects the macroscopic mechanical strength of the backfilling. The energy matching coefficient K was introduced to quantitatively characterize the energy relationship between the filling body and the excavated ore body. The variation of the curing time of the mixed aggregate cemented backfill in the stope was obtained under different ratio parameters. Based on the parameters such as filling slump, curing strength and curing time, a set of optimal ratio parameters is selected: the cement content is 310 kg/m3, the mass concentration is 76%, and the waste rock content is 60%. © 2021, China Science Publishing & Media Ltd. All right reserved.
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页码：3750 / 3761
页数：11
相关论文
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