Experimental-numerical investigation on grout diffusion and washout in rough rock fractures under flowing water

Wang, Yu-Han; Yang, Ping; Li, Zhitang; Wu, Shao-Jie; Zhao, Zi-Xin

doi:10.1016/j.compgeo.2020.103717

Cited by 38 publications

(10 citation statements)

References 41 publications

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“…The properties of the fracture network are challenging to investigate due to their complexity. A more complicated fracture network with different combinations, roughness, dimensions, inclinations, fluid–solid coupling, and gravity in grouting will be further investigated in the future. ,− The water source and pressure is more complicated than in natural conditions, which were simplified in the experiment. In addition, grouting from multiple boreholes was not investigated; only grouting from a single borehole was studied.…”

Section: Discussionmentioning

confidence: 99%

Anisotropic Propagation of Chemical Grouting in Fracture Network with Flowing Water

et al. 2021

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This paper presents an experimental investigation on the propagation of chemical grouting in a two-dimensional permeated fracture network with various aperture widths. As grouting engineering is often concealed in most experiments, the propagation of grout in fractures is not fully understood. The anisotropic permeability of geological masses with different aperture widths was found and has been investigated since 1960. The deflection flow effect was first found by Tian for groundwater flow in two groups of fractures with different aperture widths. Field grouting indicated that the grout propagates along a group of fractures with larger apertures that are longer while propagating a shorter distance along fractures with small apertures. This phenomenon implies a deflection for grout propagation in fractures with different aperture widths. The results of our study confirm this and indicate that there would be an anisotropy of grout propagation when the two groups of aperture widths are different. The water flow conditions also cause the difference in grout propagation length. When the aperture widths of the two groups of fractures are the same, the propagation shows symmetrical ellipse propagation. The results show the anisotropy of the grout increases as the aperture width ratio increases. This study helps in understanding the mechanism of chemical grouting in fractures with different apertures and flowing water and outlines some implications for grouting design in a fractured rock mass.

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Section: Discussionmentioning

confidence: 99%

Anisotropic Propagation of Chemical Grouting in Fracture Network with Flowing Water

et al. 2021

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“…The diffusion behavior of polyurethane grouting in water-bearing cracks was affected by groundwater pressure and groundwater temperature [ 45 ]. The research object of grout diffusion under the influence of dynamic water was constant density grout in several studies [ 47 , 48 , 49 , 50 , 51 ]. The first domestic and foreign dynamic water grouting model test bench was developed in 2008.…”

Section: The Diffusion Of Polyurethane Grout In Water Environmentmentioning

confidence: 99%

“…Numerical simulation is widely used in the study of polyurethane grout diffusion due to its simple advantages [ 48 , 60 , 61 ]. A numerical approach for simulating the grout diffusion with variable density in two-dimensional fracture was developed based on the computational fluid dynamics theory, and the numerical solution of the two-phase flow system of polymer and water was attained [ 62 ].…”

Section: The Diffusion Of Polyurethane Grout In Water Environmentmentioning

confidence: 99%

“…A numerical approach for simulating the grout diffusion with variable density in two-dimensional fracture was developed based on the computational fluid dynamics theory, and the numerical solution of the two-phase flow system of polymer and water was attained [ 62 ]. The Bingham constitutive model was applied to describe the grouting flow behavior, and the numerical model was established to determine the effect of various grouting parameters on the grouting diffusion erosion process [ 48 ]. Statistical analysis demonstrated that the grouting effect under the same roughness and the flow condition was related to the aperture variation coefficient (COV).…”

Section: The Diffusion Of Polyurethane Grout In Water Environmentmentioning

confidence: 99%

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Preparation and Performance of Water-Active Polyurethane Grouting Material in Engineering: A Review

et al. 2022

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Polyurethane foam materials have broad application prospects in practical engineering as flame retardants, waterproof coatings, and grout repair materials due to advantages such as light weight, quick forming, and good durability. Due to water’s low cost and convenience, water-reactive Polyurethane foam materials are widely used in engineering. The content of the water has a significant effect on the performance of polyurethane foams after molding. Polyurethane foams with anti-seepage and reinforcement effects are used in complex water environments for long durations. This study analyzed the effects of water content on properties and the diffusion mechanism of polyurethane foam materials in water. Additionally, the effect of the water environment on the polyurethane grouting material’s properties was summarized. Finally, this study discussed the future research directions of polyurethane foam materials in a water environment.

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“…Based on VOF method and comparing with previous experiments, Wang et al carried out the numerical simulation of slurry flow in rough fractures. 33 In the study of Cui et al, the outflow rate of quick setting slurry was evaluated based on VOF method. 34 In the discretization of governing equations, the finite volume method (FVM) is widely used in CFD since its conservation.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of slurry property effect on grouting and blocking of flowing water in rock fractures

Pan

Zhang

et al. 2023

Num Anal Meth Geomechanics

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In order to investigate the slurry flow behavior, our newly proposed numerical method is applied to simulate the fracture grouting with flowing water condition. First, by numerical validation and experiment comparison, the advantages of this method in computation efficiency and accuracy are shown. Second, the initial velocity of water and slurry properties at different levels are selected as the influencing factors, the water reduction effect, grouting pressure, and slurry deposition behavior in different cases are investigated, and the variation characteristics of flow field and slurry outflow are analyzed. The simulation results show that within the range of slurry properties and flow velocity given in this paper, cement slurry cannot seal the water inflow. Instead, quick setting slurry with different material ratios can effectively seal the fracture. The sealing efficiency is more sensitive to the initial flow rate than the slurry property. When the groundwater flow rate is low, the effect of slurry proportion on sealing can be ignored. Meanwhile, slurry properties have more influence on the final grouting pressure. There is an obvious surge in grouting pressure after sealing, which can be used as a criterion for fracture sealing.

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Experimental-numerical investigation on grout diffusion and washout in rough rock fractures under flowing water

Cited by 38 publications

References 41 publications

Anisotropic Propagation of Chemical Grouting in Fracture Network with Flowing Water

Anisotropic Propagation of Chemical Grouting in Fracture Network with Flowing Water

Preparation and Performance of Water-Active Polyurethane Grouting Material in Engineering: A Review

Numerical investigation of slurry property effect on grouting and blocking of flowing water in rock fractures

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