针对泥水平衡盾构机循环系统的排浆管道运输堵塞情况,基于计算流体力学(Computational Fluid Dynamics, CFD)和离散元(Discrete Element Method, DEM)双向耦合方法,模拟了波纹管道中泥浆和石材颗粒相互作用下的运输过程,研究了颗粒相和流体相随时间的演化。结果表明:波纹管道实现了向内波纹会聚管流场加速效应,泥浆通过波纹结构时流速显著增加,高速流域面积扩增;更多管道底部处石材颗粒与管壁的滑动摩擦变为滚动摩擦,降低了石材与管道间的摩擦磨损,且底部泥浆具有向上流动的趋势,使得石材颗粒获得向上的速度分量,分布在流场作用更强的位置;波纹管壁附近,湍流动能随着泥浆的流动而增大,泥浆与管壁的摩擦损失以及湍流流动带来的热能耗散则使得总压减小较为明显;波纹函数振幅增大或者周期减小均有利于缓解石材颗粒的堵塞情况,但周期过小会导致个别石材颗粒长时间滞留;在石材颗粒易堆积管段使用波纹加速结构能有效避免堵塞情况。
In response to the blockage situation in the discharge pipeline of the slurry circulation system in the slurry shield machine, a two-way coupling method based on Computational Fluid Dynamics (CFD) and Discrete Element Method (DEM) is used to simulate the transportation process of slurry and stone particles interacting in corrugated pipelines. The evolution of the particulate phase and the fluid phase over time was studied. The results show that: The corrugated pipeline achieves an accelerated effect on the converging pipe flow field with inward corrugations. The flow velocity of the slurry significantly increases when passing through the corrugated structure, and the high-speed flow area expands. More stone particles at the bottom of the pipeline change from sliding friction with the pipe wall to rolling friction, reducing the frictional wear between the stones and the pipeline, and the slurry at the bottom tends to flow upwards, giving the stone particles an upward velocity component, distributing them in a position with stronger flow field effects. Near the corrugated pipe wall, the turbulent kinetic energy increases with the flow of the slurry, while the friction loss between the slurry and the pipe wall and the thermal energy dissipation caused by the turbulent flow significantly reduce the total pressure. Increasing the amplitude of the corrugated function or decreasing the period is beneficial in alleviating the blockage of stone particles, but an excessively small period can cause individual stone particles to be retained for extended periods. Using a corrugated acceleration structure in pipe sections where stone particles tend to accumulate can effectively prevent clogging.
[1] 魏顺华, 张华, 邱健.泥水平衡盾构机泥浆环流系统的设计及选型[J].现代制造技术与装备, 2022, 58(8): 73-78.(Wei Shunhua, Zhang Hua, Qiu Jian.Design and selection of mud circulation system for mud balance shield machine[J].Modern Manufacturing Technology and Equipment, 2022, 58(8): 73-78.(in Chinese))
[2] 王雪, 邓立营, 谢宝玲.泥水平衡盾构泥浆环流系统工作模式与参数计算[J].四川水泥, 2023 (3): 184-187.(Wang Xue, Deng Liying, Xie Baoling.Working mode and parameter calculation of slurry balance shield slurry circulation system[J].Sichuan Cement, 2023 (3): 184-187.(in Chinese))
[3] Xu T, Wu X Y, Liu J X, et al.A biomass-enhanced bentonite slurry for shield tunnelling in the highly permeable soil[J].Tunnelling and Underground Space Technology, 2024, 147: 105744.
[4] Mao J H, Yuan D J, Wang B H, et al.Experimental study on Interaction between slurry and soil on excavation face of shield in sand stratum[J].KSCE Journal of Civil Engineering, 2024, 28(1): 396-408.
[5] 庄绪良.大直径泥水盾构排浆管压力损失规律研究[J].四川建筑, 2024, 44(1): 170-172.(Zhuang Xuliang.Research on pressure loss law of slurry pipeline of large diameter slurry shield[J].Sichuan Architecture, 2024, 44(1): 170-172.(in Chinese))
[6] Guo Y D, Li X G, Fang Y G, et al.Investigation into the pregelatinized starch additive alleviated the deterioration in rheological properties of slurries induced by high-temperature environment and seawater intrusion during submarine slurry shield tunneling[J].Tunnelling and Underground Space Technology, 2024, 147: 105693.
[7] 刘晋余, 丁建文, 刘慧刚, 等.泥水盾构施工循环掘进泥浆制备试验研究[J].地下空间与工程学报, 2024(3): 929-938.(Liu Jinyu, Ding Jianwen, Liu Huigang, et al.Experimental study on preparation of circulating tunneling slurry for slurry shield tunneling[J].Chinese Journal of Underground Space and Engineering, 2024(3): 929-938.(in Chinese))
[8] 杨振兴, 孙振川, 游永锋, 等.泥水平衡盾构中海水泥浆性质试验研究[J].地下空间与工程学报, 2020, 16(2): 359-365.(Yang Zhenxing, Sun Zhenchuan, You Yongfeng, et al, Experimental study on properties of seawater slurry for mud-balanced shield construction[J].Chinese Journal of Underground Space and Engineering, 2020, 16(2): 359-365.(in Chinese))
[9] 杨火军, 罗锐.大悬浮轻颗粒固液两相流中的有序结构[J].工程力学, 2004, 21(6): 138-143.(Yang Huojun, Luo Rui.Ordered structure in large and light particle-liquid two phase flows[J].Engineering Mechanics, 2004, 21(6): 138-143.(in Chinese))
[10] 张力, 梁发云, 王琛.水平渗流作用下无黏性土接触冲刷细颗粒起动机理分析[J].工程力学, 2021, 38(5): 143-150.(Zhang Li, Liang Fayun, Wang Chen.Fine soil particle entrainment induced by contact erosion between cohesionless soil layers under horizontal seepage condition[J].Engineering Mechanics, 2021, 38(5):143-150.(in Chinese))
[11] 何康, 施华斌, 余锡平.基于两相流理论的稀疏和致密颗粒流统一模型[J].工程力学, 2023, 40(8): 24-35.(He Kang, Shi Huabin, Yu Xiping.The unified model for dilute and dense granular flows based on the two-phase flow theory[J].Engineering Mechanics, 2023, 40(8): 24-35.(in Chinese))
[12] Guo Y D, Li X G, Jin D L, et al.Assessment onthe reverse circulation performance of slurry shield pipeline system assisted with CFD-DEM modeling under sandy cobble stratum[J].Powder Technology, 2023, 425: 118573.
[13] Wang H, Ding W T, Yang W M, et al.Research on the cuttings discharge in air cushion chamber of slurry shield based on CFD-DEM coupling method[J].Particuology, 2024, 91: 88-105.
[14] Liu J Y.Hanley K J.CFD-DEM modelling of the infiltration of non-spherical slurry particles in granular soils[J].Computers and Geotechnics, 2023, 164: 105845.
[15] Zhang Z X, Yin T, Huang X, et al.Slurry filtration process and filter cake formation during shield tunnelling: Insight from coupled CFD-DEM simulations of slurry filtration column test[J].Tunnelling and Underground Space Technology, 2019, 87: 64-77.
[16] Liu C, Zhu D L, Cui J, et al.Investigation on synchronous grouting process during shield tunneling in coarse grained ground using CFD-DEM approach[J].Computers and Geotechnics, 2024, 170: 106308.
[17] Lin Y F, Fang Y, He C.Numerical study on clogging mechanism of slurry infiltration in porous media based on coupled CFD-DEM method[J].Tunnelling and Underground Space Technology, 2022, 128: 104622.
[18] Zhu Y Z, Sun H L, Xu S L, et al.Mechanics of the penetration and filtration of cement-based grout in porous media: New insights from CFD-DEM simulations[J].Tunnelling and Underground Space Technology, 2023, 133: 104928.
[19] Yin T, Zhang Z X,Huang X, et al.On the morphology and pressure-filtration characteristics of filter cake formation: Insight from coupled CFD-DEM simulations[J].Tunnelling and Underground Space Technology, 2021, 111: 103856.
[20] Yang D, Xia Y M, Wu D, et al.Numerical investigation of pipeline transport characteristics of slurry shield under gravel stratum[J].Tunnelling and Underground Space Technology, 2018, 71: 223-230.
[21] E D Y, Zhou P, Guo S Y, et al.Particle shape effect on hydrodynamics and heat transfer in spouted bed: A CFD-DEM study[J].Particuology, 2022, 69(10): 10-21.
[22] Mindlin R D, Deresiewicz H.Elastic spheres in contact under varying oblique forces[J].Journal of Applied Mechanics, 1953, 20(3): 327-344.
[23] Xiao Y Q, Cai Y Z, Sun C Y, et al.Bionic pipeline transport characteristics with transverse protuberances in slurry shield circulation system based on CFD-DEM[J].Powder Technology, 2024, 432: 119133.
[24] Fadodun O O, Fadodun O G, Kaood A.Hydrothermal performance and entropy production rate of rGO-CO3O4/H2O hybrid nanofluid in corrugated-converging pipes[J].International Journal of Thermal Sciences, 2024, 199: 108911.
[25] Guo Y D, Li X G, Sun Y, et al.Investigation into the flow characteristics of slurry shield pipeline system under sandy pebble stratum: Model test and CFD-DEM simulation[J].Powder Technology, 2023, 415: 118149.
