An efficient algorithm for simulating grout propagation in 2D discrete fracture networks

Mohajerani, Soheil; Baghbanan, Alireza; Wang, Gang; Forouhandeh, S.F.

doi:10.1016/j.ijrmms.2017.07.015

Cited by 44 publications

(13 citation statements)

References 22 publications

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“…e period cannot be too long, either. Otherwise, the spreading range of the grout will be challenging to control, and the grouting project will not be effective and timely [19]. A sealing material with high fluidity was designed by adjusting the amount of added admixtures according to the actual needs of sealing and the characteristics of ultrafine cement.…”

Section: Methodsmentioning

confidence: 99%

Experimental Research on Performance of New Gas Drainage Borehole Sealing Material with High Fluidity

Guo

Xue

Zheng

et al. 2021

Advances in Materials Science and Engineering

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To ensure the sealing effect of gas extraction borehole in underground coal mine and improve the concentration of gas extraction, a kind of high-flow sealing material which can be injected into the microcracks around borehole was developed. The ultrafine cement as the base material, with water-reducing agent, expansion agent, retarder, the material, and water combined stir, will form a kind of colloid with high fluidity and slightly expansibility. This paper analyzes the differences between the new high-fluidity sealing material and ordinary cement materials in expansion performance, compressive strength, and sealing performance. Scanning electron microscope and mercury intrusion method were used to analyze the differences in microscopic morphology and pore structure of these two materials. The experimental results show that the new high-fluidity sealing material has an excellent fluidity of 295.5 mm with an expansion rate of 60 d being 1.562%. The new high-fluidity sealing material is convenient for grouting with strong material permeability and superior sealing performance. Field test results show that the effect of the new high-fluidity sealing material is better than the ordinary cement materials. The average drainage concentration and flux during the drainage period were 59.07% and 0.243 m3/min, respectively, which showed that the drainage efficiency was significantly improved. This novel sealing material is of great significance for improving the efficiency of drilling and drainage.

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Section: Methodsmentioning

confidence: 99%

Experimental Research on Performance of New Gas Drainage Borehole Sealing Material with High Fluidity

Guo

Xue

Zheng

et al. 2021

Advances in Materials Science and Engineering

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“…This is because the grouting process is conducted from top to bottom, so the fracture 1-1647 is grouted and deformation occurred before fracture 1-872, which offsets most deformation of the upper surface of the fracture 1-872. As for region 3 , the distance between the fracture 3-2881 and the fracture 1-872 is small with 0.293 m, but the rock mass is still relatively rigid due to only a small portion of fracture 2-562 being inserted in the rock mass of this region, so that region 3 does not have large displacement. Overall, the maximum displacement of the entire area is 0.1181 mm, which is very small, so there will be no generation of new fractures and other adverse conditions in this area under the action of grouting.…”

Section: Analysis Of Structural Calculationmentioning

confidence: 99%

“…Many high dams are built in areas with complicated geological conditions, and the numerous fractures and voids will increase the permeability and decrease the strength of the rock mass, which affect the stability and safety of the dam's foundations. As a common and effective measure to improve the geological conditions of dam foundations, grouting is used to fill up the joints and fractures in the rock mass so as to prevent seepage and improve the bearing capacity and deformation resistance [1][2][3][4]. However, fracture grouting is still a difficult issue due to complicated fracture distribution, complex fluid-structure interaction effects, and incomplete information on grout diffusion behavior and corresponding fracture deformation.…”

Section: Introductionmentioning

confidence: 99%

Grouting Process Simulation Based on 3D Fracture Network Considering Fluid–Structure Interaction

et al. 2019

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Grouting has always been the main engineering measure of ground improvement and foundation remediation of hydraulic structures. Due to complex geological conditions and the interactions between the grout and the fractured rock mass, which poses a serious challenge to the grouting diffusion mechanism analysis, fracture grouting has been a research hotspot for a long time. In order to throw light on the grout diffusion process in the fractured rock mass and the influence of grout on the fracture network, and to achieve more realistic grouting numerical simulation, in this paper a grouting process simulation approach considering fluid–structure interaction is developed based on the 3D fractured network model. Firstly, the relationship between fracture apertures and trace lengths is used to obtain a more realistic value of fracture aperture; then a more reliable model is established; subsequently, based on the 3D fracture network model, different numerical models are established to calculate fluid dynamics (grout) and structure deformation (fractured rock mass), and the results are exchanged at the fluid–structure interface to realize the grouting process simulation using two-way fluid-structure interaction method. Finally, the approach is applied to analyze the grouting performance of a hydropower station X, and the results show that the grouting simulation considering fluid–structure interaction are more realistic and can simultaneously reveal the diffusion of grout and the deformation of fracture, which indicates that it is necessary to consider the effect of fluid–structure interaction in grouting simulation. The results can provide more valuable information for grouting construction.

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“…However, this approach is limited by the requirement of site-specific fracture information. Mohajerani et al [25,26] developed an efficient algorithm of explicit grout forehead pressure to simulate the grout propagation within the fractures. In brief, whether applying a structured or stochastic network, the aforementioned works mostly take one-dimensional channel model as the basic unit.…”

Section: Introductionmentioning

confidence: 99%

A Quasi‐3D Numerical Model for Grout Injection in a Parallel Fracture Based on Finite Volume Method

Hao

Zhong

et al. 2019

Complexity

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The purpose of the present work is to develop a quasi-3D numerical method that can be used to study the diffusion mechanism of grout injection in a rock fracture based on the collocated structured grid of the finite volume method (FVM). Considering the characteristics of fracture in geometry that the aperture is much less than its length and width, the Hele-Shaw model is introduced to deduce the z-derivatives of velocities u and v at walls, which is a function of the relevant average velocity and the fracture aperture. The traditional difference scheme for the diffusive term is partly substituted with the derived analytical expressions; hence a three-dimensional problem of grout flow in the parallel fracture can be transformed into a two-dimensional one that concerns fracture aperture. The new model is validated by the analytical solution and experimental data on three cases of grouting in the parallel-plate fracture. Compared with the results from ANSYS-Fluent software, the present model shows better agreement with the analytical solution for the distribution of pressure and velocity. Furthermore, the new model needs less grid unit, spends less time, but achieves greater accuracy. The complexity of the grout flow field in the rock fracture is reduced; thus the computational efficiency can be improved significantly.

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An efficient algorithm for simulating grout propagation in 2D discrete fracture networks

Cited by 44 publications

References 22 publications

Experimental Research on Performance of New Gas Drainage Borehole Sealing Material with High Fluidity

Experimental Research on Performance of New Gas Drainage Borehole Sealing Material with High Fluidity

Grouting Process Simulation Based on 3D Fracture Network Considering Fluid–Structure Interaction

A Quasi‐3D Numerical Model for Grout Injection in a Parallel Fracture Based on Finite Volume Method

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