|
|
|
| Study on the complete transport characteristics of muck in discharge pipe of slurry shields for complex strata |
| YU Wenduan1, WANG Han2
|
1. China Railway 14th Bureau Group Co., Ltd., Jinan 250014, Shandong, China;
2. School of Qilu Transportation, Shandong University, Jinan 250002, Shandong, China |
|
|
|
|
Abstract To provide scientific guidance for optimizing pipe design and predicting blockage risks, this study first established a numerical simulation model for muck transport in discharge pipes based on the CFD-DEM coupling method. The accuracy of the model was validated by comparing the simulated particle settling velocity with experimental data. Subsequently, the effects of pipe flow velocity(v), slurry concentration(sc), pipe inclination angle(θ), and muck particle radius(r)on transport characteristics were systematically investigated. The results indicated that an increase in v significantly enhanced the average transport velocity of muck. Specifically, when v was raised from 2 m·s-1 to 5 m·s-1, the average velocity increased from 0.56 m·s-1to 3.53 m·s-1. In contrast, increasing sc demonstrated limited effectiveness in mitigating blockage risks. Moreover, larger pipe inclination angles(θ)led to a sudden decrease in the average transport speed upon the muck entering the ascending pipe segment, suggesting that steep inclination angles should be avoided in engineering practice. Furthermore, smaller muck exhibited higher transport efficiency, whereas larger ones posed a greater blockage risk.
|
|
Published: 29 December 2025
|
|
|
|
|
|
|
|
