Method for calculating pressure losses in the pipelines of slurry shield tunneling based on coupled simulation of computational fluid dynamics and discrete element method
Method for calculating pressure losses in the pipelines of slurry shield tunneling based on coupled simulation of computational fluid dynamics and discrete element method
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DOI：
10.1111/mice.13049
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发表时间：
2023-05
期刊：
影响因子：
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通讯作者：
Yi Yang;Xing-gao Li;Yidong Guo;Yingran Fang
中科院分区：
文献类型：
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作者：
Yi Yang;Xing-gao Li;Yidong Guo;Yingran Fang
液压出渣/运输或泥浆管道输送广泛用于疏浚、挖沟、（深海）采矿、隧道钻探和许多其他应用。泥水盾构施工中的泥水输送是复杂水力出渣系统的典型实例，其特点是泥水的流变特性复杂，且含有大颗粒和不规则颗粒。与其他液压出渣系统相比，这些特性使得难以估计沿沿着泥浆管道的压力损失。基于计算流体力学-离散元法（CFD‐DEM）耦合模拟，建立了一种预测泥水盾构长距离输送压力损失的有效方法。进行流变试验，为CFD计算提供可靠的浆料流动参数。采用三维扫描技术对不同尺寸的不规则卵石进行数字化扫描，并将扫描模型应用到DEM中，成功应用于北京某泥水盾构隧道工程。通过对典型浆体管道的建模，揭示了流体相和颗粒相的力学特性。将该方法计算的浆体管道沿沿着向压力损失与现场实测值进行了比较，验证了该方法的有效性。模拟结果表明，泥浆流经手肘时，由于离心力的作用，会形成二次流。不同粒径的卵石在重力和浆体耦合力的共同作用下表现出不同的运动响应。与直段相比，颗粒的湍流将增加手肘区域中的摩擦压力损失。该工作为类似工程的泥浆循环系统布置提供了有价值的参考。
Hydraulic mucking/transport or slurry pipelining are widely used in dredging, trenching, (deep sea) mining, tunnel boring, and many other applications. Slurry pipelining during slurry shield tunneling is a classic instance of complex hydraulic mucking systems, which is characterized by the complex rheological behavior of the slurry and the inclusion of large and irregular particles. These characteristics make it difficult to estimate the pressure losses along slurry pipelines, compared to other hydraulic mucking systems. This study established a powerful method for predicting the pressure losses in long‐distance slurry pipelining of slurry shield tunneling based on computational fluid dynamics–discrete element method (CFD‐DEM)‐coupled simulations. Rheological tests were carried out to provide reliable slurry flow parameters for CFD calculations. Irregular pebbles with different sizes were digitally scanned using 3D scanning technology, and the scanned models were applied to the DEM. This method was successfully applied to a slurry shield tunnel project in Beijing, China. The mechanical properties of the fluid phase and particle phase were revealed by modeling a typical slurry pipeline. A comparison of the pressure losses along slurry pipelines was made between the proposed method and field data, indicating the validity of the established method. The simulation results indicate that when the slurry flows through the elbow, a secondary flow will be formed due to centrifugal force. Pebbles of different sizes show different motion responses under the combined action of gravity and slurry coupling force. The turbulent flow of particles will increase the frictional pressure losses in the elbow area, compared to the straight section. This work provides a valuable reference for the layout of the slurry circulation system of similar projects.