Coupled Viscous Fluid Flow and Joint Deformation Analysis for Grout Injection in a Rock Joint

Kim, Hyung-Mok; Lee, Jun Young; Yazdani, Mahmoud; Tohidi, Elham; Nejati, Hamid Reza; Park, Eui-Seob

doi:10.1007/s00603-017-1339-3

Cited by 38 publications

(16 citation statements)

References 12 publications

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“…Deng et al [4] proposed a CFD simulation approach based on 3D fracture network model to study the grouting process of a dam's foundation. Kim et al [9] used UDEC to simulate the flow of Bingham grout in a single joint with smooth parallel surfaces and considered the hydromechanical coupling to study its effect on grouting performance. Ao et al [10] simulated the grouting process in underground goaf and analyzed the stability by applying one-way fluid-structure interaction.…”

Section: Of 19mentioning

confidence: 99%

“…Rafi and Stille [24] described the basic mechanism of elastic deformation during grouting and discussed its impact on the spread of grout. In literature [9], the authors strongly recommended that the interaction between the grout flow and fractured rock mass should be included in the grouting analysis in order to have a precise prediction of grout performance. With this in mind, the fluid-structure interaction (FSI) method as a numerical technique is used to solve problems that involve the mutual interaction of fluid and structure.…”

Section: Of 19mentioning

confidence: 99%

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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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Section: Of 19mentioning

confidence: 99%

Section: Of 19mentioning

confidence: 99%

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

et al. 2019

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“…Compared with shallow-buried roadways, the contrast between the high stress and low strength of deep surrounding rock is extremely prominent. For deep surrounding rock with high stress and fracture development, grouting reinforcement can significantly improve the structure and mechanical properties of fractured rock masses [1][2][3][4]. In grouting fractured rock, the grout diffuses, flows into the fracture, and finally solidifies.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Mechanical Properties of Rock Fracture after Grouting Reinforcement

et al. 2020

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Grouting reinforcement plays an important role in repairing fractures and improving the strength of the surrounding rock. To address practical engineering challenges such as caving and chip off-falling of surrounding rock in deep roadways, normal splitting was adopted to prefabricate fractures on rock samples gathered from underground coal mines. This was done to better match the rock fracture specimen with actual conditions. Based on the elementary unit of a fracture surface, systematic experiments were conducted on the tensile properties of rock fractures after grouting reinforcement, and the shear properties were studied after considering the presence of gas. As per the results, the tensile strength of rock fractures increased with the increase in viscosity of grout, but the overall tensile strength was relatively low. The overall tensile effect of surrounding rock was improved less by grouting approach. When the presence of fracture gas in grouting was considered, the peak shear strength of fractures after grouting was 8.34–29.9% less than that without considering the fracture gas. The cemented pore surface produced by unsaturated cementation in the grouting reinforcement was the main cause of reduction in cohesion and frictional angle of rock fractures. The conclusions of this study have great significance for guiding engineering grouting and evaluating the grouting effect.

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“…Funehag and Fransson [12] investigated a large number of experimental studies and field measurements on the penetration grouting into fractured natural rocks, which obtained the grout diffusion radius. In addition to experimental research, Kim et al [13] conducted a series of numerical analysis by using UDEC to simulate the grout diffuse through smooth parallel surfaces based on the Bingham fluid model. They found that the grout penetration length was overestimated without considering the time-dependent hardening of grout material.…”

Section: Introductionmentioning

confidence: 99%

Cement Grout Nonlinear Flow Behavior through the Rough-Walled Fractures: An Experimental Study

Jin

Han

et al. 2020

Geofluids

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This research experimentally studied the effects of various fracture roughness (characterized by the fractal dimension D) and normal stress (normal loads FN) applied to fracture on ultrafine cement grout nonlinear flow behavior through rough-walled plexiglass fractured sample. A high-precision and effective sealing self-made apparatus was developed to perform the stress-dependent grout flow tests on the plexiglass sample containing rough-walled fracture (fracture apertures of arbitrary variation were created by high-strength springs and normal loads according to design requirements). The real-time data acquisition equipment and high-precision self-made electronic balance were developed to collect the real-time grouting pressure P and volumetric flow rate Q, respectively. At each D, the grouting pressure P ranged from 0 to 0.9 MPa, and the normal loads FN varied from 1124.3 to 1467.8 N. The experimental results show that (i) the Forchheimer equation was fitted very well to the results of grout nonlinear flow through rough-walled fractures. Besides, both nonlinear coefficient (a) and linear coefficient (b) in Forchheimer’s equation increased with increase of D and FN, and the larger the FN was, the larger the amplitude was. (ii) For normalized transmissivity, with the increase of Re, the decline of the T/T0−β curves mainly went through three stages: viscous regime, weak inertia regime, and finally strong inertia regime. For a certain D, as the normal load FN increased, the T/T0−β curves generally shifted downward, which shows good agreement with the single-phase flow test results conducted by Zimmerman. Moreover, with the increase of D, the Forchheimer coefficient β decreased. However, within smaller FN, β decreased gradually with increasing D and eventually approached constant values. (iii) At a given FN, Jc increased with increasing D.

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Coupled Viscous Fluid Flow and Joint Deformation Analysis for Grout Injection in a Rock Joint

Cited by 38 publications

References 12 publications

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

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

Experimental Study on the Mechanical Properties of Rock Fracture after Grouting Reinforcement

Cement Grout Nonlinear Flow Behavior through the Rough-Walled Fractures: An Experimental Study

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