Macro and micro grouting process and the influence mechanism of cracks in soft coal seam

Hao, Yu; Jia, Housheng; Liu, Shaowei; Zhi-he, Liu; Li, Baoyu

doi:10.1007/s40789-020-00404-2

Cited by 34 publications

(16 citation statements)

References 28 publications

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“…Then, this instrumented bolt is installed in a rock block. Grout is used to bond the bolt with the rock block (Chen et al, 2021b;Yu et al, 2021). After full curing, the bolt is pulled out.…”

Section: Previous Study On the Ss Propagation Investigation Approachesmentioning

confidence: 99%

Analysis on the Shear Stress Propagation Mechanism in the Rock Reinforcement System

Chen

Zhao

et al. 2022

Front. Earth Sci.

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Rock reinforcement is significant in maintaining the stability of excavated structures, such as tunnels and underground roadways. However, shear failure in the rock reinforcement system, especially the shear failure at the rock reinforcement bolt surface, induces a threat to the rock reinforcement system. To reveal the shear stress (SS) propagation mechanism in the rock reinforcement system, this article conducted a literature review. First, the investigation approaches that were used by previous researchers to study the SS propagation were summarized. The advantages and disadvantages of experimental tests, analytical simulation, and numerical simulation were compared and analyzed. Then, the SS propagation process in the rock reinforcement system was presented. Two typical SS propagation modes were explained. More attention was given to the SS propagation mode in which the maximum SS propagates from the external end of rock reinforcement bolts to the internal end of rock reinforcement bolts. After that, a discussion section was given. In the discussion section, the significance of the SS propagation was further emphasized. Moreover, the limitations in the analytical simulation and numerical simulation were indicated. It is concluded that when studying the SS propagation mechanism of rock reinforcement bolts, combining experimental tests, analytical simulation, and numerical simulation is a better choice. This study is beneficial for revealing the SS propagation mechanism of the rock reinforcement system.

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Section: Previous Study On the Ss Propagation Investigation Approachesmentioning

confidence: 99%

Analysis on the Shear Stress Propagation Mechanism in the Rock Reinforcement System

Chen

Zhao

et al. 2022

Front. Earth Sci.

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“…Among them, Zhang et al (2018a, b, c), Liu et al (2019), Zheng et al . (2021), Yu et al (2021) and Li (2020) respectively used the particle flow DEM software PFC 2D/3D to explain the cement grout diffusion range and pressure law during grouting. Unlike conventional simulation methods, the DEM does not require complex constitutive equations.…”

Section: The Research Status On Numerical Simulation Of Rock Groutingmentioning

confidence: 99%

The numerical simulation of rock mass grouting: a literature review

Tong

Yang

Duan

et al. 2021

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PurposeThe purpose of this article is to understand the current research status and future development trends in the field of numerical simulation on rock mass grouting.Design/methodology/approachThis article first searched the literature database (EI, Web of Science, CNKI, etc.) for keywords related to the numerical simulation of rock mass grouting to obtain the initial literature database. Then, from the initial database, several documents with strong relevance to the numerical simulation theme of rock mass grouting and high citation rate were selected; some documents from the references were selected as supplements, forming the sample database of this review study (a total of 90 articles). Finally, through sorting out the relationship among the literature, this literature review was carried out.FindingsThe numerical simulation of rock mass grouting is mainly based on the porous media model and the fractured media model. It has experienced the development process from Newtonian fluid to non-Newtonian fluid, from time-invariant viscosity to time-varying viscosity, and from generalized theoretical model to engineering application model. Based on this, this article summarizes four scientific problems that need to be solved in the future in this research field: the law of grout distribution at the cross fissures, the grout diffusion mechanism under multi-field coupling, more accurate grouting theoretical model and simulation technology with strong engineering applicability.Originality/valueThis research systematically analyzes the current research status and shortcomings of numerical simulation on rock mass grouting, summarizes four key issues in the future development of this research field and provides new ideas for the future research on numerical simulation on rock mass grouting.

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“…e e ect of temperature on coal and rock is related to coal type, physical structure of the section, components involved, and heating temperature of coal. Many scholars have carried out a large number of detailed experiments and obtained valuable results from the genesis and classi cation of coal pores and ssures based on the in uence of temperature on the pore structure and permeability of coal and rock masses [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of 3D Micro-CT on Meso-Structure Evolution of Coal Samples with Different Coal Grades under the Action of Temperature

Xie

Zhao

2022

Mathematical Problems in Engineering

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In the three-dimensional micro-CT experiment system, the room temperature is set to 300°C when different coal samples (lignite, anthracite, lean coal and gas coal) are observed for mesoscopic observation. The evolution regularity of mesoscopic structure is analyzed according to the CT scan of coal samples under different temperatures and three sections of scanning images, and by ImageJ image processing software, image processing, and analysis of the characteristics of the profile, the following conclusions are obtained: (1) Coal specimen will have an overall expansion deformation along with the rise of temperature. The sample expansion can be divided into two types: outward expansion and inward expansion. Outward expansion means that the expansion of the skeleton extends outward from the adjacent pores, while inward expansion means that the solid skeleton intrudes into the adjacent pores. When the temperature rises, the outward expansion and inward expansion occur simultaneously. The dominant expansion mode is influenced by the type of coal sample and the temperature value. (2) With the increase of temperature, coal and anthracite coal specimen pore fissure structure shows an expansion tendency before contraction, while gas coal and lean coal show reverse patterns; in addition to the above the reason of the difference vitrinite differences, one must also consider selected specimen original porosity and mechanical physical properties, such as a combination of other factors. (3) In the temperature range of 100–200°C, when the temperature increases at the same rate, lignite porosity increases the most, followed by gas coal, lean coal, and anthracite. (4) There are certain differences in the variation trends of the pixel proportions of the three sections of the coal specimen, and the temperature values of the three curves at the maximum pixel point are also different, which indicates that the expansion of each point in the coal specimen with the change of temperature is not completely synchronous, and the physical and mechanical properties of the sample are heterogeneous.

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Macro and micro grouting process and the influence mechanism of cracks in soft coal seam

Cited by 34 publications

References 28 publications

Analysis on the Shear Stress Propagation Mechanism in the Rock Reinforcement System

Analysis on the Shear Stress Propagation Mechanism in the Rock Reinforcement System

The numerical simulation of rock mass grouting: a literature review

Experimental Study of 3D Micro-CT on Meso-Structure Evolution of Coal Samples with Different Coal Grades under the Action of Temperature

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