Liu Bo, Zhang Yaoping, Yang Shixing
College of Resources and Building Engineering, Gannan University of Science and Technology, Ganzhou, 341000, Jiangxi, China.
College of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
Sci Rep. 2025 Jan 4;15(1):789. doi: 10.1038/s41598-024-84955-3.
Uneven of filling aggregate gradation may cause transportation problems such as pipe blockage due to segregation and stratification of filling slurry. To study the influence of aggregate gradation on the conveying performance of filler slurry, aggregate gradation experiments were carried out, rheological tests on slurries with coal gangue/aeolian sand ratios (6:4, 5:5 and 4:6) showed that appropriately increasing the proportion of aeolian sand can improve particle gradation. Computational fluid dynamics (CFD) scheme was used to simulate the pipeline transportation characteristics of the slurry under the conditions of three sets each of coal gangue/aeolian sand ratios, slurry concentrations (72%,74% and 76%), and inlet velocities (1.15,1.24 and 1.33 m/s). The results show that the pipeline resistance loss is directly proportional to the slurry concentration and inlet velocity, and inversely proportional to the coal gangue/aeolian sand, which indicates that the proportion of aeolian sand should be reduced in filling project to reduce the pipeline transportation resistance.
骨料级配填充不均匀可能会导致运输问题，例如由于填充浆液的离析和分层造成管道堵塞。为了研究骨料级配对填充浆液输送性能的影响，进行了骨料级配实验，对煤矸石/风积沙比例为（6:4、5:5和4:6）的浆液进行流变试验，结果表明适当增加风积沙比例可以改善颗粒级配。采用计算流体动力学（CFD）方案，模拟了煤矸石/风积沙比例、浆液浓度（72%、74%和76%）以及入口速度（1.15、1.24和1.33米/秒）各三组条件下浆液的管道输送特性。结果表明，管道阻力损失与浆液浓度和入口速度成正比，与煤矸石/风积沙成反比，这表明在填充工程中应降低风积沙比例以减小管道输送阻力。
