Column Penetration and Diffusion Mechanism of Bingham Fluid Considering Displacement Effect

Yang, Zhiquan; Zhang, Dan; Li, Chaoyue; Zhang, Zhiwei; Zhu, Yingyan; Yang, Yi; He, Na; Bai, Xianfu; Xi, Wenfei; He, Da; Ding, Yanqiao; Zhang, Meng

doi:10.3390/app12115362

Cited by 8 publications

(5 citation statements)

References 12 publications

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“…The influence of sandy soil porosity on grout diffusion has been studied extensively. Based on the existing studies, the sandy soil porosity varied from 0.3 to 0.57 [23,27,38,49,50]. When the porosity ϕ is 0.3, the corresponding permeability coefficient K w is 5.00 × 10 −4 m/s [38,41].…”

Section: Porosity ϕ and Permeability Coefficient K Wmentioning

confidence: 99%

Pressure Model Study on Synchronous Grouting in Shield Tunnels Considering the Temporal Variation in Grout Viscosity

Ma,

Sun,

Jiang

et al. 2023

Applied Sciences

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The grout pressure in the shield tunnel tail void during synchronous grouting is the key to controlling ground settlement and restraining the segment. However, the circumferential, longitudinal, and radial distribution of grout pressure considering the temporal variation in grout viscosity has not been well explored yet. In this study, a theoretical model of grout pressure distribution and dissipation considering the temporal variation in Bingham grout viscosity was established. The simulation results of the pressure model were verified by field-measured data. The results showed that the radial and longitudinal distributions of grout pressure considering the temporal variation in grout viscosity were closer to the field-measured data. The impacts of the main parameters on the pressure distribution and dissipation were analyzed. Compared with the effect of the shield tail void thickness, tunnel radius and yield shear stress have greater effects on grout pressure during the circumferential filling phase. During the longitudinal and radial diffusion phases, the increase in soil porosity and permeability coefficient was conducive to grout diffusion. The increase in the grout viscosity reduces the pressure loss during the grout flow process. The results of this research can provide a theoretical basis for the grout design process in shield tunnels.

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Section: Porosity ϕ and Permeability Coefficient K Wmentioning

confidence: 99%

Pressure Model Study on Synchronous Grouting in Shield Tunnels Considering the Temporal Variation in Grout Viscosity

Ma,

Sun,

Jiang

et al. 2023

Applied Sciences

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“…Currently, there is relatively little research on the filtration effect in seepage grouting. Some scholars have conducted indoor tests to study the seepage effect's influence on grouting diffusion [21][22][23]. In terms of model, F Bouchelaghem [24] studied the micro mechanism of the filtration effect, the coupling calculation model of fluid convection, hydrodynamic dispersion and other factors.…”

Section: Introductionmentioning

confidence: 99%

Grouting mechanism and experimental study of goaf considering filtration effect

Zhu

Ouyang

et al. 2023

PLoS ONE

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The filtration effect significantly affects the gangue slurry velocity and concentration, making it difficult to evaluate the gangue slurry diffusion range. Based on the Darcy seepage law, a seepage theoretical calculation model is established considering the filtration time and space effect. And the "water-cement ratio change matrix" in the seepage process of coal gangue slurry is deduced, revealing the basic mechanism of the porous media filtration effect, and the water-cement ratio gradually increases in the seepage process of gangue slurry. The visual test platform for slurry diffusion in goaf was independently developed for testing. The active heating optical fiber method (AHFO) was used to monitor the flow and diffusion of coal gangue slurry in the collapse zone of goaf, and the gravity gradient and water cement ratio of slurry in goaf were measured. The law of particle sedimentation in the gangue slurry flow process under the filtration effect was revealed, and engineering verification was carried out. The results show that the average slope of the gangue slurry in the gangue accumulation is 6.34%, and the overall flow law of the gangue slurry in the goaf is the first longitudinal expansion and then transverse diffusion. The water-cement ratio near the grouting mouth is smaller than the initial water-cement ratio, the near-end water-cement ratio is smaller, and the far-end water-cement ratio is larger. During on-site filling, the accumulated grouting volume of a single hole is 700 m3, and the gangue slurry diffusion distance is greater than 45m, indicating that the gangue slurry has good fluidity.

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“…Wang et al [23] obtained the spatial distribution expression of viscosity decay rate considering the in uence of water-cement ratio through a one-dimensional visual grouting test, and derived the Bingham uid column permeability grouting theoretical formula considering the spatial decay of viscosity. Yang et al [24] proposed a Bingham uid column permeation and diffusion mechanism considering the effect of grout on groundwater displacement. Wang et al [25] derived the conventional permeation and diffusion mechanism of Bingham uid in porous media based on the equation of seepage motion.…”

Section: Introductionmentioning

confidence: 99%

Simulation test study on filling flow law of gangue slurry in goaf

Liang,

Zhao,

Shi

et al. 2023

Preprint

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The disposal and utilization of solid waste of coal gangue is one of the main problems in coal mining in China. Injecting coal gangue into goaf in the form of slurry can effectively solve the problems of ground stacking and environmental pollution prevention. In order to obtain the flow law of gangue slurry in the void of the accumulated rock in the goaf, a visualization simulation test device for gangue slurry permeation grouting in the goaf was independently designed. The flow and diffusion characteristics, flow and diffusion velocity changes, void pressure changes, and viscosity changes of three mass concentrations (76%, 78%, 80%) of gangue slurry in the void between caved rock blocks in goaf were studied by visual grouting simulation test. The results show that: (1) The seepage process of gangue slurry in the goaf simulation test is divided into three diffusion forms, namely radial diffusion, axial diffusion, and bidirectional diffusion. The three diffusion forms are interrelated and inseparable. (2) The initial flow velocity of the slurry with different concentrations is different under the same permeation grouting pressure, and the higher the slurry concentration, the smaller the initial flow velocity of the slurry. The velocity of the slurry has a nonlinear relationship with the diffusion distance of the slurry. (3) With the permeation and diffusion of slurry, pressure sensors at different positions are subjected to pressure from bottom to top and enter the pressure boost stage, gradually forming stress peaks. When the slurry exceeds the position of the pressure sensor, the pressure on the pressure sensor is weakened and begins to enter the pressure relief stage, and the stress decline trend gradually becomes gentle with time. (4) The water loss effect occurs during slurry flow interaction with rock mass, resulting in slurry viscosity increasing. The viscosity of the slurry affects the difference in the amount of viscosity change. The research results can provide a certain theoretical basis for the goaf gangue slurry filling project.

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Column Penetration and Diffusion Mechanism of Bingham Fluid Considering Displacement Effect

Cited by 8 publications

References 12 publications

Pressure Model Study on Synchronous Grouting in Shield Tunnels Considering the Temporal Variation in Grout Viscosity

Pressure Model Study on Synchronous Grouting in Shield Tunnels Considering the Temporal Variation in Grout Viscosity

Grouting mechanism and experimental study of goaf considering filtration effect

Simulation test study on filling flow law of gangue slurry in goaf

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