Modelling of Permeation Grouting considering Grout Self-Gravity Effect: Theoretical and Experimental Study

Fu, Yiming; Wang, Xiuling; Zhang, Sizhan; Yang, Yong

doi:10.1155/2019/7968240

Cited by 20 publications

(11 citation statements)

References 42 publications

(45 reference statements)

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“…Due to the influence of the seepage effect, the seepage coefficient of rock and soil mass changes with time, mainly reflected in the change of porosity, as shown in the following equation [36,37]:…”

Section: Plos Onementioning

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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Section: Plos Onementioning

confidence: 99%

Grouting mechanism and experimental study of goaf considering filtration effect

Zhu

Ouyang

et al. 2023

PLoS ONE

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“…Most existing studies on the grout pressure during synchronous grouting in the shield tail void ignore the temporal variation in grout viscosity. In addition, grout penetration into the soil occurs after the grout fills the shield tail void, which has an influence on the grout pressure [25][26][27][28][29]. The initial pressure of grout penetration into the soil depends on the grout filling pressure in the shield tail void.…”

Section: Introductionmentioning

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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“…The slurry flow patterns of Newtonian, Bingham, and power-law fluids have been investigated. The established diffusion models mainly include the spherical, cylindrical, and cylindrical-hemispherical models [11][12][13][14]. Regarding compaction grouting, the fluid-solid coupling effect between the slurry and soil is mainly studied in combination with the theories of ball hole expansion or column hole expansion and soil nonlinear compaction.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Research on Grouting in Deep Loose Layers Based on the Cylindrical Diffusion Model of Radial Tube Flow

et al. 2022

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Grouting in deep, loose layers are a complex process in which many modes such as infiltration, splitting, and compaction coexist. It is of great significance to establish a realistic, simplified physical model to study the law of slurry diffusion. Herein, a cylindrical diffusion model of radial tube flow is established, and the control differential equations of both the Bingham slurry diffusion velocity in a single tube and the diffusion velocity of the radial tube flow are deduced. Additionally, the calculation formulas for the diffusion radius and slurry pressure distribution function are obtained. The rationality of the theory is verified by combining our results with those of the field grouting test of the Guotun coal mine. The results show that the cylindrical diffusion model of radial tube flow can successfully characterize the slurry diffusion law of grouting in a deep, loose layer. The slurry pressure attenuation shows distinguishable stages: within the first 30% of the diffusion radius, the slurry pressure decreased sharply by approximately 70%, and the slurry pressure decreases slowly in the later stages. Furthermore, the diffusion radius has a nonlinear, negative correlation with the height of the grouting section and the comprehensive injection rate of formation; the change rate is relatively more gradual, and there are no distinguishable stages. The research results provide a theoretical basis for reasonably determining the grouting parameters of deep, loose layers in the future.

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Modelling of Permeation Grouting considering Grout Self-Gravity Effect: Theoretical and Experimental Study

Cited by 20 publications

References 42 publications

Grouting mechanism and experimental study of goaf considering filtration effect

Grouting mechanism and experimental study of goaf considering filtration effect

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

Theoretical Research on Grouting in Deep Loose Layers Based on the Cylindrical Diffusion Model of Radial Tube Flow

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