Numerical study on the muck flow behavior in the screw conveyor during EPB shield tunneling

Jin, Dalong; Guo, Yidong; Li, Xinggao; Yang, Yi; Fang, Yingran

doi:10.1016/j.tust.2023.105017

Cited by 9 publications

(4 citation statements)

References 25 publications

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“…Screw conveyors can be used to transport and mix more than one type of material during material transfer [8][9][10], and the 3D model is shown in Figure 1. The rotary motion of the shaftless auger facilitates the conveying and simultaneous mixing of granular material through the discharge area [11,12]. The Shaftless Screw Conveyor has a strong anti-tangling property, which can reduce the interference of easily tangled materials and then convey materials easily and quickly, which cannot be done by a Shafted Screw Conveyor.…”

Section: Introductionmentioning

confidence: 99%

“…[24] pioneered the development of the MAX system. This groundbreaking innovation introduced the vacuum filtration principle commonly employed in mining to revolutionize the solid-liquid separation process of The rotary motion of the shaftless auger facilitates the conveying and simultaneous mixing of granular material through the discharge area [11,12]. The Shaftless Screw Conveyor has a strong anti-tangling property, which can reduce the interference of easily tangled materials and then convey materials easily and quickly, which cannot be done by a Shafted Screw Conveyor.…”

Section: Introductionmentioning

confidence: 99%

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Design and Experimental Study of Negative Pressure Spiral Separation and Reduction Device for Drilling Holes

Ren,

Huang,

Zhang

et al. 2024

Machines

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Currently, screw conveyors and negative pressure vacuum screens with negative pressure vibration units are used for handling drilling cuttings both domestically and internationally. However, there is currently no effective solution to address the high liquid content of drilling cuttings during their conveyance by screw conveyors. In this paper, a novel design scheme for a negative pressure spiral separation and reduction device is proposed based on an extensive literature survey. This device aims to effectively reduce the liquid content of drilling cuttings during their conveyance by screw conveyors, thereby minimizing the overall liquid content throughout the drilling process. The structural design of the negative pressure spiral separation and reduction device is conducted using theoretical analysis and 3D solid modeling methods, while strength analysis of the negative pressure suction unit is performed using a finite element method. Additionally, theoretical research on relevant process parameters is carried out, and an online real-time testing system for experiments is designed. An analysis of experimental results demonstrates that within 151 s, the liquid suction rate of the device can reach 51%, with an average flow speed of approximately 0.008 m/s, thus achieving the desired target for drilling cutting separation and reduction. By designing this new negative pressure spiral separation and reduction device, its feasibility has been verified through acceptable engineering results obtained from experimentation; furthermore, it aims to achieve an optimal liquid suction effect for drilling cuttings in order to enhance solid–liquid separation efficiency, as well as to improve drilling fluid recovery efficiency by conserving mud materials and reducing overall drilling costs.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and Experimental Study of Negative Pressure Spiral Separation and Reduction Device for Drilling Holes

Ren,

Huang,

Zhang

et al. 2024

Machines

View full text Add to dashboard Cite

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“…Many scholars have analyzed the role of conditioning agents and proposed applications for different conditioned soils [6][7][8][9]. Jin D et al [10] analyzed soil transport inside a screw conveyor based on CFD, and gave a spewing damage surface controlled by the properties of the soil when the pressure at the outlet of the screw conveyor is atmospheric pressure. Regarding the permeability coefficient, some scholars suggest that the permeability coefficient of the conditioned soil needs to be able to remain below 10 -3 cm/s~10 -4 cm/s for at least 90 minutes [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…Reasonable determination of the water flow and water pressure in the screw conveyor is of great significance in solving the problem of spewing. Shield model test and numerical simulation are effective methods to analyze the mechanism of spewing, some scholars have studied the transportation of soil in shield structure through model tests [15][16][17][18] and CFD [10,19,20], and the results show that the water pressure distribution within the screw conveyor under steady state seepage is approximated as one-dimensional seepage.…”

Section: Introductionmentioning

confidence: 99%

Analytical study of EPB shield spewing discrimination in auxiliary air pressure mode

Zheng,

Yu,

et al. 2023

Preprint

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Considering the effect of auxiliary air pressure on the shield seepage field, the spewing problem is analyzed by using an analytical method. Soil conditioning is currently the main method that can be used to prevent and control the occurrence of shield spewing, but there is a lack of research on how low the soil permeability coefficient should be conditioned. To further study the mechanism of the occurrence of spewing, this paper uses the variable separation method and the superposition principle to derive an analytical solution of the two-dimensional seepage field of the shield under the auxiliary air pressure mode, and calculates the critical permeability coefficient of spewing based on a previous study. The accuracy of the analytical solution is verified by comparison with numerical simulations. Parametric analyses show that when the auxiliary air pressure fluctuates at the lower design limit, it slightly helps to avoid spewing, but as the auxiliary air pressure becomes greater than the water pressure at the bottom of the cutter face, the risk of spewing will be greater than that of the closed mode. After the water pressure at the bottom of the cutter face is greater than 28m, the critical permeability coefficient of a typical size shield will be less than 10-4cm/s, and the empirical way of controlling the permeability coefficient to 10-4~10-3cm/s has a risk of spewing. By comparison with the spewing example, the prediction of the critical permeability coefficient of spewing by the analytical solution is proven to be effective.

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Modeling of reinforced-concrete cutting with shield rippers using FEM-DEM-coupling method

Jin,

Guo,

et al. 2024

International Journal of Mechanical Sciences

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Numerical study on the muck flow behavior in the screw conveyor during EPB shield tunneling

Cited by 9 publications

References 25 publications

Design and Experimental Study of Negative Pressure Spiral Separation and Reduction Device for Drilling Holes

Design and Experimental Study of Negative Pressure Spiral Separation and Reduction Device for Drilling Holes

Analytical study of EPB shield spewing discrimination in auxiliary air pressure mode

Modeling of reinforced-concrete cutting with shield rippers using FEM-DEM-coupling method

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