Utilizing concrete pillars as an environmental mining practice in underground mines
Utilizing concrete pillars as an environmental mining practice in underground mines
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利用混凝土柱作为地下矿山的环保采矿实践
DOI：
10.1016/j.jclepro.2020.123433
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发表时间：
2021
影响因子：
11.1
通讯作者：
Yang Fudou
中科院分区：
文献类型：
--
作者：
Cao Shuai;Xue Gaili;Yilmaz Erol;Yin Zhenyu;Yang Fudou
地面控制是矿井设计和工人安全不可或缺的要素。地下矿山使用混凝土支柱对于维护结构的经济和运行安全至关重要。本文通过室内试验和现场试验，对纤维混凝土(FRC)作为立柱进行了研究。用机械压力机和计算机断层扫描(CT)仪研究了玻璃纤维、聚丙烯纤维和聚丙烯腈纤维增强混凝土的强度性能。分别测试纤维体积分数为0、0.4、0.8和1.2wt%的样品。结果表明，随着纤维的加入，复合材料的强度先由于桥联效应而提高，然后由于拔出效应而降低。与参考样品相比，吸收的能量通过基质开裂、纤维-基质界面脱粘和纤维断裂等机制防止了FRC的劣化。纤维混凝土的峰值应变随纤维的增加呈线性上升。灰度值分布曲线与二维CT孔洞和裂缝分布也有较好的对应关系，说明灰值处理可以刻画纤维增强混凝土和不掺纤维混凝土的结构行为。理论分析表明，对于可持续开采而言，该矿柱保持稳定。此外，FRC柱的位置和大小适合于试验采场的数值计算。本研究成果可为地下矿山矿体矿柱回收提供重要参考。
Ground control is an integral element of mine design and worker safety. The use of concrete pillars for underground mines is of paramount importance to maintaining the economic and operational security of structures. This paper deals with the use of fiber-reinforced concrete (FRC) as pillars via laboratory and field tests. The strength performance of prepared concrete reinforced with glass, polypropylene and polyacrylonitrile fibers was researched by a mechanical press and a computed tomography (CT) tool. Samples were tested for fiber volume fractions of 0, 0.4, 0.8 and 1.2 wt%, respectively. Results have indicated that, with the addition of fibers, the strength was improved first due to a bridging effect and then decreased due to a pull-out effect. Compared to the reference sample, the absorbed energy prevents FRC from deterioration by mechanisms of matrix cracking, fiber-matrix interface debonding and fiber rupture. The peak strains of FRC linearly rise with increasing fiber. The gray value distribution curves have also good correspondence with 2D CT pore and crack distributions, which reveal that gray value processing could depict the structural behavior of concretes reinforced with or without fiber. Theoretical analyses show that the pillar remains stable for sustainable mining. Besides, the location and size of FRC pillars are suitable for numerical calculations of the trial stope. The findings of this study can offer a key reference for the orebody pillar recovery in underground mines.
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