Theoretical and experimental research on the grout fronts diffusion considering filtration effect

Feng, Xiao; Li, Shucai; Liu, Rentai; Wang, Han; Zhang, Shijie

doi:10.1360/n092017-00078

Cited by 8 publications

(4 citation statements)

References 7 publications

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“…(1) Grouting Pressure. The grouting pressure was related to the stratigraphic configuration, buried depth of the mined-out area, and slurry fluidity [25]. Through field tests, the grouting pressure of this project was determined to be approximately 1.0-1.2 MPa.…”

Section: Determination Of Process Parametersmentioning

confidence: 96%

“…where Q is the single-hole grouting volume (m 3 ), L is the length of the grouting section and is designed to be 6 m in this project, n is the porosity (0.4-0.5), and λ is the slurry loss coefficient (1.1-1.2) [7,25]. According to Equation (3), the single hole grouting volume is 119.43 m 3 (taking the median value of each parame-ter), and it should be dynamically adjusted according to the field grouting situation.…”

Section: Determination Of Process Parametersmentioning

confidence: 99%

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Properties and Engineering Applications of a New Goaf Grouting Filling Material

et al. 2022

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In the treatment of goafs in traffic engineering, technical problems such as those related to large-volume grouting and the precise control of material properties are often encountered. To address these issues, we developed a new composite material comprising cement-fly ash-modified sodium silicate (C-FA-MS). The setting time, fluidity, unconfined compressive strength, and microstructure were varied for different proportions of cement-sodium silicate (C-S) slurry, cement-fly ash-sodium silicate (C-FA-S) slurry, and C-FA-MS slurry, and their performances were compared and analysed. The experimental results showed that the initial setting time of the slurry was the shortest when both the original sodium silicate volume ratio ( V S ) and modified sodium silicate volume ratio ( V MS ) were 0.2. The final setting time of the C-S and C-FA-S slurries tended to decrease but then increased with decrease in V S , while that of the C-FA-MS slurry increased with lower V MS . The fluidity of the C-FA-S and C-FA-MS slurries decreased with decrease in V S or V MS at different fly ash admixture ratios. The consolidation compressive strength of C-S increased with decreasing V S , while that of C-FA-S showed a considerable increase only when V S decreased from 0.4 to 0.2. Meanwhile, the compressive strength of the C-FA-MS concretions first increased and then decreased with decrease in V MS . Microstructural analysis revealed that there were more cracks in the C-S agglomerate, the fly ash in the C-FA-S agglomerate reduced the relative density of the skeletal structure, and the stronger cross-linking in the C-FA-MS agglomerate improved the strength of the agglomerate. Under the condition of unit grouting volume, the cost of the C-FA-MS slurry was approximately 44.7% and 31.3% lower than that of the C-S and C-FA-S slurries, respectively. The new C-FA-MS material was applied for the treatment of the goaf in the Wu Sizhuang coal mine. Core drilling detection and audiofrequency magnetotelluric survey revealed that the goaf was sufficiently filled.

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Section: Determination Of Process Parametersmentioning

confidence: 96%

Section: Determination Of Process Parametersmentioning

confidence: 99%

Properties and Engineering Applications of a New Goaf Grouting Filling Material

et al. 2022

Self Cite

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“…Li et al [64] studied the influence of the percolation effect on the porosity, permeability, and slurry flow rate of an injected medium using the Kozeny-Carman model. Feng et al [65] established a theoretical model for the three-dimensional front infiltration diffusion of cement slurry based on the law of mass conservation, the linear filtration law, and the permeability continuity equation. They found that the viscosity of the slurry had a significant impact on the filtration effect and the effective diffusion distance of the slurry.…”

Section: Current Status Of Research On the Percolation Effect On Slur...mentioning

confidence: 99%

A State-of-the-Art Review on the Study of the Diffusion Mechanism of Fissure Grouting

Du,

Li,

Fang

et al. 2024

Applied Sciences

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China is renowned for its extensive underground engineering projects and the complex geological and hydrological conditions it faces. Grouting treatment technology is widely employed in deep-buried mines and tunnels, where grouting parameters such as materials, pressure, volume, and hole arrangement significantly impact the effectiveness of grouting. This review paper comprehensively examines current research on grouting materials, theories, experiments, and numerical simulations. It summarizes the various factors that must be considered during the grouting process of fissures and explores the diffusion mechanisms of grout under their influence. Furthermore, further research is needed on the mechanisms and treatment methods for poor grouting in rock masses, the distribution patterns of fissures, optimization methods for grouting parameters, and grout quality assessment techniques. Future research should focus on developing more efficient experimental methods with higher accuracy levels while advancing grouting technologies. Establishing comprehensive and accurate rock mass models along with improving monitoring capabilities are also crucial aspects to consider. Therefore, studying the diffusion mechanisms of grout in fissured rock masses is of significant importance for the practical operation of underground engineering projects.

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“…Currently, most of the experimental studies on sand grouting concentrate on the diffusion pattern of permeation grouting, which initially involved the characterization of effects of grout properties (e.g., particle size and w/c ratio), sand layer properties (e.g., particle size distribution and permeability), and grouting pressure on grout diffusion and reinforcement [8][9][10][11][12]. And then, the studies delved into the time-varying viscosity for different grout flow regimes, the filtration effect in porous sandy media, and the diffusion mechanism of the grout for grout diffusion paths [13][14][15][16][17]. The above studies mainly focused on the diffusion of grout in the pore space of sandy soil stratum, during which the grout had no obvious effect on the sand skeleton.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Grout–Soil Interaction Effects in Sandy Soil under Different Water-to-Cement Ratios

Hu,

Lu,

Deng

et al. 2024

Buildings

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Due to the unique characteristics of sandy soil layers, there is often a coupling effect of multiple grout diffusion patterns in the grouting process, and different slurry diffusion modes may lead to different responses of soil structures. In this study, laboratory grouting model tests were conducted with homogeneous sand under different water-to-cement (w/c) ratios to reveal the temporal variations in grouting pressure, soil stress fields, and displacement fields during the grout diffusion process. The results show that, during the grouting process in the fine sand layer, the grout mainly exhibited a compaction–splitting diffusion mode. The farther away from the grouting center, the more pronounced the hysteresis effect of soil pressure caused by grout diffusion. Meanwhile, as the w/c ratio increased, the diffusion mode between the slurry and the soil was in a transitional state. At w/c > 1.2, the primary pattern changed from the fracture–compaction pattern to the permeation–fracture–compaction pattern and fracture–permeation pattern. And the overall trend of the grouting pressure curve was similar under all of the w/c ratio conditions, showing a trend of increasing to the maximum value of the pressure first and then decreasing. With the increase in the water–cement ratio, the overall value of the grouting pressure curve showed a decreasing trend, the pressure value increased more slowly with time before reaching the maximum value, and the more obvious the influence of water–cement ratio was when w/c > 1.2. Additionally, the surface displacement also exhibited an overall decreasing trend, and it had no obvious lifting value under the condition of w/c = 1.6.

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Theoretical and experimental research on the grout fronts diffusion considering filtration effect

Cited by 8 publications

References 7 publications

Properties and Engineering Applications of a New Goaf Grouting Filling Material

Properties and Engineering Applications of a New Goaf Grouting Filling Material

A State-of-the-Art Review on the Study of the Diffusion Mechanism of Fissure Grouting

Experimental Study on Grout–Soil Interaction Effects in Sandy Soil under Different Water-to-Cement Ratios

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