Study on Slag Discharge Characteristics of Slurry Discharge Pipe of Slurry Shield

Renjie Wu; Yi Liao; Wenwu Yang

doi:10.54097/pzjr7f16

Authors

Renjie Wu
Yi Liao
Wenwu Yang

DOI:

https://doi.org/10.54097/pzjr7f16

Keywords:

Horizontal inclined pipeline; Inclination angle; Fluid-solid coupling; Slurry shield; Pipeline slag discharge.

Abstract

Based on the two-way coupling method of Computational Fluid Dynamics (CFD) and Discrete Element Method (DEM), this paper simulates the transportation process under the interaction of slurry and stone particles in slurry pipeline under different parameter variables. According to the evolution of particle phase and fluid phase with time, the transportation characteristics of slurry pipeline are analyzed. The results show that in the horizontal inclined pipeline system, the velocity of the flow field is centripetally gathered when the slurry flows through the elbow area, and the non-uniformity increases with the increase of the inclination angle. The larger the horizontal inclination angle of the pipeline is, the more significant the mud pressure loss is, and the turbulent kinetic energy is positively correlated with the inclination angle. The accumulation of stone particles is mainly concentrated in the second elbow area of the pipeline. The number of particles increases significantly with the increase of inclination angle, while the average velocity fluctuates less. The results of this study can provide a theoretical basis for the optimization of pipeline laying parameters and anti-clogging design of slurry circulation system of slurry shield.

References

[1] Wang, H. (2021). Discussion on the application of shield technology in coal roadway driving. Shanxi Coal, 40(1), 128-130,138. doi:10.3969/j.issn.1671-749X.2021.01.032.

[2] Li, J., Jingliujie, Y., Chen, Y., Fulong, L., Na, Z., & Pengyu, L. (2023). Discussion on the technical characteristics and implementation path of intelligent shield tunneling. Tunnel Construction, 43(3), 355-368. doi:10.3973/j.issn.2096-4498.2023.03.001.

[3] Liu, H., Xu, S., Guo, Y., Fang, Y., & Li, X. (2024). Analysis of the Effect of Slurry Rheological Model on the Pressure Loss Characteristics of Slurry Discharge Pipe of Slurry Shield. Modern Tunnelling Technology, Vol.61(No.1), 182-189. doi:10.13807/j.cnki.mtt.2024.01.018.

[4] Sun, Y., Li, X., Guo, Y., & Liu, H. (2024b). Model tests and simulation analyses of starting characteristics of muck in slurry-discharge pipelines of slurry shield in sandy pebble stratum. Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering, Vol.46(No.9), 1945-1955. doi:10.11779/cjge20230459.

[5] LI, X., GUO, Y., SUN, Y., & LIU, H. (2024). Pressure Loss of Pipeline Conveying Large-Size Pebbles in Slurry Discharge System of Slurry Shield. Journal of South China University of Technology (Natural Science Edition), Vol.52(No.7), 135-144. doi:10.12141/j.issn.1000-565X.230559.

[6] Sun, C., Xu, Z., Xiao, Y., Cui, G., Zhang, X., Wang, P., et al. (2024a). Analyze of pipeline transport characteristics and optimization method of structural parameters in slurry shield circulation system with spiral structure. Powder Technology, Vol.444(No.0), 120001. doi:10.1016/j.powtec.2024.120001.

[7] Xu, L., Wang, H., Sun, J., Hao, J., Suzuki, H., & Xi, X. (2024). Analysis of Flow Characteristics of Slurry Pipeline of Large-Diameter Tunneling Shield. Mining and Metallurgy Engineering, (stage 6). doi:10.3969/j.issn.0253-6099.2024.06.004.

[8] Lianhui, J. I. A., Yanqiu, X., Chi, Z., Yizhou, C. A. I., Weiwei, Z., & Jian, C. (2023). Study on slurry-water shield circulation system's slurry slag-carrying characteristics based on CFD-DEM method. Machine Design, 40(12), 126-132. doi:10.13841/j.cnki.jxsj.2023.12.028.

[9] Huang, K., Wan, J.W., Chen, C.X., He, L.Q., Mei, W.B., Zhang, M.Y., 2013. Experimental investigation on water flow in cubic arrays of spheres. J. Hydrol. 492, 61–68. https://doi.org/10.1016/j.jhydrol.2013.03.039.

[10] Karpf, C., Hoeft, S., Scheffer, C., Fuchs, L., Krebs, P., 2011. Groundwater infiltration, surface water inflow and sewerage exfiltration considering hydrodynamic conditions in sewer systems. Water Sci. Technol. 63 (9), 1841–1848. https://doi.org/10.2166/ wst.2011.388.

[11] Long, Y.Y., Tan, Y., 2020. Soil arching due to leaking of tunnel buried in water-rich sand. Tunn. Undergr. Space Technol. 95, 103158 https://doi.org/10.1016/j. tust.2019.103158.

[12] Meguid, M.A., Dang, H.K., 2009. The effect of erosion voids on existing tunnel linings. Tunn. Undergr. Space Technol. 24 (3), 278–286. https://doi.org/10.1016/j. tust.2008.09.002.

[13] Zheng, G., Dai, X., Zhang, X.S., 2014. Experimental study and numerical simulation of leaking process of sand and water in underground engineering. Chin. J. Rock Mech. Eng. 33 (12), 2458–2471. https://doi.org/10.13722/j.cnki.jrme.2014.12.011.

[14] Zhou, J.Q., Liu, H.B., He, X.L., Tang, H.M., Zhao, X.J., 2021. A semi-empirical model for water inflow into a tunnel in fractured-rock aquifers considering non-Darcian flow. J. Hydrol. 597, 126149 https://doi.org/10.1016/j.jhydrol.2021.126149.

[15] van Lopik, J.H., Zazai, L., Hartog, N., Schotting, R.J., 2020. Nonlinear flow behavior in packed beds of natural and variably graded granular materials. Transp. Porous Med. 131, 957–983. https://doi.org/10.1007/s11242-019-01373-0.