Experimental Study on Consolidation Characteristics of Concentrated Full Tailings and Research on Pore Water Relief Methods of Piles

IF 1.5 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Advances in Civil Engineering Pub Date : 2024-04-29 DOI:10.1155/2024/6644300

Sha Wang, Guodong Mei, Yifan Chu, Weixiang Wang, Yali Wang, Lijie Guo

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Abstract

Surface harmless storage of concentrated full tailings (CFTs) involves the technology of adding a curing agent to the tailings slurry discharged from the thickener to realize the modification of the tailings and centralized storage of the tailings on the surface to realize the harmless treatment of the tailings. High water content of tailings is still the key technical problem that restricts the harmless storage of piles at present. Regarding the above problems, we implemented the consolidation test and numerical simulation of seepage-stress coupling consolidation of CFT, clarified the consolidation characteristics and parameters of CFT under different curing ages, and conducted a comparative analysis of pore water pressure in the whole cross-section of piles with different drainage schemes based on the results of the test. In addition, we also clarified the drainage effect of interlayer drainage on reducing the excess pore water pressure of piles and compared the simulation results of the pore water pressure of piles under different permeability coefficients. The results show that as the permeability coefficient of the concentrated tailings material decreases, the pore pressure accumulation inside piles under the same drainage scheme is more serious, and the length of time for consolidation and stabilization becomes longer. Therefore, it is recommended that the excess porous water pressure be relieved by means of increased drainage facilities under a small permeability coefficient.

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浓缩全尾矿固结特性试验研究及桩基孔隙水疏松方法研究

浓缩全尾矿（CFTs）地表无害化堆存涉及在浓缩机排出的尾矿浆中添加固化剂实现尾矿改性和尾矿地表集中堆存实现尾矿无害化处理的技术。尾矿含水率高仍然是目前制约尾矿库无害化堆存的关键技术问题。针对上述问题，我们进行了 CFT 的固结试验和渗流-应力耦合固结数值模拟，明确了不同固化龄期下 CFT 的固结特性和参数，并根据试验结果对不同排水方案的桩体全断面孔隙水压力进行了对比分析。此外，我们还明确了层间排水对降低桩身过剩孔隙水压力的排水效果，并比较了不同渗透系数下桩身孔隙水压力的模拟结果。结果表明，随着尾矿浓缩材料渗透系数的降低，在相同排水方案下，桩内孔隙压力积聚更严重，固结稳定时间更长。因此，建议在渗透系数较小的情况下，通过增加排水设施来缓解多余的孔隙水压力。

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来源期刊

Advances in Civil Engineering Engineering-Civil and Structural Engineering

CiteScore

4.00

自引率

5.60%

发文量

612

审稿时长

15 weeks

期刊介绍： Advances in Civil Engineering publishes papers in all areas of civil engineering. The journal welcomes submissions across a range of disciplines, and publishes both theoretical and practical studies. Contributions from academia and from industry are equally encouraged. Subject areas include (but are by no means limited to): -Structural mechanics and engineering- Structural design and construction management- Structural analysis and computational mechanics- Construction technology and implementation- Construction materials design and engineering- Highway and transport engineering- Bridge and tunnel engineering- Municipal and urban engineering- Coastal, harbour and offshore engineering-- Geotechnical and earthquake engineering Engineering for water, waste, energy, and environmental applications- Hydraulic engineering and fluid mechanics- Surveying, monitoring, and control systems in construction- Health and safety in a civil engineering setting. Advances in Civil Engineering also publishes focused review articles that examine the state of the art, identify emerging trends, and suggest future directions for developing fields.