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Properties of Gobi Aggregate and Sulfide-Rich Tailings Cemented Paste Backfill and Its Application in a High-Stress Metal Mine
Advances in Civil Engineering ( IF 1.8 ) Pub Date : 2021-02-16 , DOI: 10.1155/2021/6624915
D. Q. Deng 1, 2 , Y. H. Liang 3 , F. C. Huangfu 4
Affiliation  

This experiment studied the influence law of the strength of CPB affected by tailings content, Gobi aggregate content, cement content, and slurry concentration. The results show, for the CPB with concentration of 77%, when the addition amount of cement reaches 20%, the addition amounts of tailings and Gobi aggregate change within the ranges of 12∼24% and 56∼68%, respectively. The strength of CPB has been gradually improved when the addition amount of Gobi aggregates decreases and the addition amount of tailings increases. In this case, the slump of CPB changes within the range of 26.5 cm∼26.9 cm while the strength of CPB changes within the range of 4.021∼6.845 MPa. Considering future utilization value of tailings, the addition amount is finally set at 16% in production, and the addition amount of Gobi aggregate is set at 64%; namely, tailings: Gobi aggregate = 20 : 80. When the addition amount of cement is 20% (cement/(tailings + Gobi aggregates) = 1 : 4), the strength of CPB reaches 5.62 MPa which meets the production requirement. When the heading machine is used for tunnelling mine roadway in bottom backfill of VCR stope, no collapse or delamination occurs without support, showing good stability and integrity of backfill. When the adjacent stope ore is mined, the backfill with cement content of 11.1%, 14.3%, 20%, and 25% is exposed. In the process of mining, no collapse or delamination occurs. Therefore, the proportion of various backfill materials applied in production is reasonable, being verified by the experiment and field test.

中文翻译:

戈壁骨料和富含硫化物的尾矿胶浆回填的特性及其在高应力金属矿中的应用

该实验研究了尾矿含量,戈壁骨料含量,水泥含量和浆液浓度对CPB强度的影响规律。结果表明,对于浓度为77%的CPB,当水泥的添加量达到20%时,尾矿和戈壁骨料的添加量分别在12%至24%和56%至68%的范围内变化。当戈壁骨料的添加量减少而尾矿的添加量增加时,CPB的强度逐渐提高。在这种情况下,CPB的坍落度在26.5cm〜26.9cm的范围内变化,而CPB的强度在4.021〜6.845MPa的范围内变化。考虑到尾矿的未来利用价值,最终将生产中的添加量设定为16%,将戈壁骨料的添加量设定为64%。即尾矿:戈壁骨料= 20:80。当水泥的添加量为20%(水泥/(尾料+戈壁骨料)= 1:4)时,CPB的强度达到5.62 MPa,可以满足生产要求。当掘进机用于VCR采场底部回填中的巷道掘进时,在没有支撑的情况下不会发生塌陷或分层,显示出良好的回填稳定性和完整性。开采相邻的采场矿石时,暴露出水泥含量分别为11.1%,14.3%,20%和25%的回填土。在采矿过程中,不会发生塌陷或分层。因此,生产中使用的各种回填材料的比例是合理的,已通过实验和现场测试得到验证。达到生产要求的62 MPa。当掘进机用于VCR采场底部回填中的巷道掘进时,在没有支撑的情况下不会发生塌陷或分层,显示出良好的回填稳定性和完整性。开采相邻的采场矿石时,暴露出水泥含量分别为11.1%,14.3%,20%和25%的回填土。在采矿过程中,不会发生塌陷或分层。因此,生产中使用的各种回填材料的比例是合理的,已通过实验和现场测试得到验证。达到生产要求的62 MPa。当使用掘进机在VCR采场底部回填中开掘巷道时,在没有支撑的情况下不会发生塌陷或分层,显示出良好的回填稳定性和完整性。开采相邻的采场矿石时,暴露出水泥含量分别为11.1%,14.3%,20%和25%的回填土。在采矿过程中,不会发生塌陷或分层。因此,生产中使用的各种回填材料的比例是合理的,已通过实验和现场测试得到验证。水泥含量分别为11.1%,14.3%,20%和25%的回填土暴露在外。在采矿过程中,不会发生塌陷或分层。因此,生产中使用的各种回填材料的比例是合理的,已通过实验和现场测试得到验证。水泥含量分别为11.1%,14.3%,20%和25%的回填土暴露在外。在采矿过程中,不会发生塌陷或分层。因此,生产中使用的各种回填材料的比例是合理的,已通过实验和现场测试得到验证。
更新日期:2021-02-16
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