Diffusion mechanism and sensitivity analysis of slurry while grouting in fractured aquifer with horizontal injection hole

Hu, Yang; Liu, Weiqun; Shen, Zhen; Gao, Kun; Liang, Dongxu; Cheng, Shixing

doi:10.1007/s13146-020-00587-4

Cited by 14 publications

(7 citation statements)

References 17 publications

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“…In the actual grouting process, the compressibility of the slurry is negligible [1], therefore, Equations ( 1) and ( 2) can be rewritten as…”

Section: Basic Equations Of the Slurry Flow Modelmentioning

confidence: 99%

“…The general view was that the greater the grouting pressure, the greater the slurry diffusion distance. However, higher grouting pressure will expand the fracture and widen the flow channel, and the time required to reach the limit diffusion distance will also increase, even leading to roadway floor and wall heave, and the slurry will diffuse to the section that does not need reinforcement [1]. Therefore, the grouting pressure should be reasonably determined.…”

Section: Determination Of Grouting Pressurementioning

confidence: 99%

“…With the exploitation of coal resource extending deeper in China, the threat of mine water disasters to coal mining safety is becoming more and more obvious [1][2][3][4][5]. In the mining process of a Carboniferous-Permian coal seam in a North China coal field, the working face is seriously threatened by a high pressure limestone aquifer [6,7] in the coal seam floor (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Diffusion Mechanism of Slurry during Grouting in a Fractured Aquifer: A Case Study in Chensilou Coal Mine, China

Zhai

Bai

2022

Mathematics

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Grouting is one of the main technical means to prevent water inrush hazards in coal seam floor aquifers. It is of great significance to elucidate the diffusion law of slurry in the process of grouting in fractured aquifers for safe mining in coal mines. In this paper, the mechanism of slurry diffusion in horizontal fractures of fractured aquifers was studied based on the Bingham slurry with time-varying characteristics; additionally, a one-dimensional seepage grouting theoretical model considering the temporal and spatial variation of slurry viscosity under constant grouting rate was established. In this model, the grouting pressure required by the predetermined slurry diffusion radius can be obtained by knowing the grouting hole pressure and injection flow. Slurry properties, fracture parameters, grouting parameters, and water pressure were the parameters affecting the slurry diffusion process. Looking at the problem of water disaster prevention of coal seam floor in the Working Face 2509 of the Chensilou Coal Mine, according to the aquifer parameters and model calculation results, a grouting scheme with a slurry diffusion radius of 20 m and grouting pressure of 12 MPa was proposed. Finally, with the comparative analysis of the transient electromagnetic method (TEM) and water inflow before and after grouting, it was verified that the design grouting pressure and the spacing of grouting holes were reasonable and the grouting effect was good.

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“…In the actual grouting process, the compressibility of the slurry is negligible [1], therefore, Equations ( 1) and ( 2) can be rewritten as…”

Section: Basic Equations Of the Slurry Flow Modelmentioning

confidence: 99%

Section: Determination Of Grouting Pressurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Diffusion Mechanism of Slurry during Grouting in a Fractured Aquifer: A Case Study in Chensilou Coal Mine, China

Zhai

Bai

2022

Mathematics

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“…In recent years, the studies on grouting diffusion theory considering the effects of fluid-solid coupling have gradually increased, but they have certain limitations. Researchers analyzed the coupling effect of stress and seepage fields in the grouting process (Guo et al, 2016;Hu et al, 2020). The coupled model analyzed the time-varying viscosity of the slurry during the grouting process and its influence on the diffusion radius of the slurry.…”

Section: Introductionmentioning

confidence: 99%

Study on numerical simulation method of viscosity time-varying slurry diffusion law

Zhang

Zhang²,

Pei³

et al. 2023

Front. Earth Sci.

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In this study, finite element and finite difference methods were used for numerical calculations. The law of slurry diffusion in the inclined plane cracks is summarized in this study. Further, the equation describing the diffusion of slurry with time-varying viscosity in the plane fracture with dip angle was derived, and the mathematical model of slurry diffusion control equation and improved entropy clustering algorithm were developed. Thus, the law of slurry diffusion with time-varying viscosity in an inclined plane fractured rock mass was studied in detail, and the control equation obtained was modified to improve the prediction accuracy of diffusion of slurry with time-varying viscosity. By applying the model to actual working conditions, the results highlighted that the improved entropy clustering algorithm could more accurately describe the relationship between the factors influencing slurry diffusion and the slurry diffusion radius. The improved entropy clustering algorithm model can adjust the weights of the factors influencing the slurry diffusion in the diffusion control equation, which leads to a more flexible and more accurate slurry diffusion control equation.

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“…To calculate the diffusion of C-S slurry in planar fractures, Zhang et al (2018) applied the mass conservation equation to slurry viscosity that varied with time, and the results revealed the intrinsic link between the rheology of C-S slurries and the influence of other parameters on fracture grouting. To address the problem of grouting in fractured aquifers, Hu et al (2020) established a theoretical model of slurry diffusion in inclined tubular fractures to analyse the effects of grouting parameters on slurry diffusion and eventually developed the corresponding diffusion equations. Rafi and Stille (2015) developed a grouting model based on the elastic jacking mechanism and Bingham fluids to investigate the effect of grouting pressure and fracture aperture variation on slurry diffusion and plugging efficiency in rock fractures.…”

Section: Introductionmentioning

confidence: 99%

Study on the diffusion law of dynamic water grouting in fracture with slurry-rock stress coupling effect

Liu,

Wang,

Sui

et al. 2023

Environ Earth Sci

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Water inrush disasters in geotechnical engineering are mainly caused by seepage in fractures, and curtain grouting is the most common method to block water flow. To ensure the effectiveness of the water blocking curtain, it is necessary to study the diffusion pattern of the slurry. In this study, by means of laboratory experiments and theoretical deductions, the grout diffusion morphology in fractures with the slurry-rock stress coupling effect is revealed, and the corresponding theoretical model is established.First, based on the failure of a water curtain in a hydropower project in Yunnan Province, a four-level four-factor orthogonal table was set up, grouting experiments were conducted by using the selfdeveloped fracture grouting device, and the relationship between the main influencing factors and fracture deformation and grout diffusion distance was revealed by variance analysis. Then, based on the Bingham fluid constitutive model, the fracture deformation equation and the grouting model with flowing water, a new fracture grouting model considering the coupling effect of slurry-rock stress was established.Finally, based on the calculations and experiments, the morphology of slurry diffusion is described, thereby proving the validity of the new model.

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Diffusion mechanism and sensitivity analysis of slurry while grouting in fractured aquifer with horizontal injection hole

Cited by 14 publications

References 17 publications

Diffusion Mechanism of Slurry during Grouting in a Fractured Aquifer: A Case Study in Chensilou Coal Mine, China

Diffusion Mechanism of Slurry during Grouting in a Fractured Aquifer: A Case Study in Chensilou Coal Mine, China

Study on numerical simulation method of viscosity time-varying slurry diffusion law

Study on the diffusion law of dynamic water grouting in fracture with slurry-rock stress coupling effect

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