Experimental study on groutability and reconstructability of broken mudstone and their relationship

Huang, Yaoguang; Zhao, Aining; Guo, Weibin; Yang, Wanxia; Zhang, Tianjun

doi:10.1007/s12517-020-05796-8

Cited by 8 publications

(2 citation statements)

References 30 publications

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“…In these schemes, the simulation of grouting support is realized by means of improving the rock strength parameter within the grout diffusion range. The grout diffusion radius is set as 1.5 m, and the rock strength parameter is raised by 1.5 times [28][29][30][31] (Figure 13d). The parameters of the roadway surrounding the rock support and the parameters of support unit are given in Tables 4 and 5.…”

Section: Support Scheme For Mining Area Risesmentioning

confidence: 99%

Research on the Deformation and Failure Characteristics and Control Technology of Mining Area Rises under the Influence of Mining Stress

et al. 2022

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Affected by mining stress, roadways surrounding rock face problems such as serious deformation and failure and difficult support. In this study, with the II2 mining area rise in Taoyuan Coal Mine taken as the engineering background, the evolution laws of stress, deformation and plastic zone area of the mining area rises during the advance process of the working face were explored with the aid of FLAC3D software. The results suggested that the stress, deformation and plastic zone area of the surrounding rock increase significantly when the distance between the working face and the track rise is less than 20 m. Based on this finding, it was further determined that the stopping line of the II8222 working face should be at least 20 m away from the track rise. Furthermore, in accordance with the deformation and failure characteristics of surrounding rock under the influence of mining stress, this paper conducted a simulation on four support schemes of mining area rises, and quantitatively analyzed the mechanical response of a roadway surrounding rock under these support schemes. The simulation results revealed that the support scheme of “bolt-mesh-spray-cable + grouting bolt” can effectively deal with the influence of mining stress on the working face. Meanwhile, an engineering application was carried out. By monitoring the surface displacement of the surrounding rock, it was found that the deformation of the roadway surrounding rock was effectively controlled, and a remarkable support effect was achieved. In short, the proposed support scheme greatly improved the stability and safety of surrounding rock in the mining area rise under the influence of mining stress.

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Section: Support Scheme For Mining Area Risesmentioning

confidence: 99%

Research on the Deformation and Failure Characteristics and Control Technology of Mining Area Rises under the Influence of Mining Stress

et al. 2022

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“…Mudstone is tightly cemented due to its fine mineral grains and the cement is mud cemented [19][20][21][22]; therefore, mudstone has low porosity [23,24], strong confinement, low permeability [25], and is a natural water barrier [26]. Abandoned mudstone is a by-product of mining production, usually located at the top of the coal seam [27].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Penetration Characteristics of Mudstone Slag-Based Waterproof Composites under Cyclic Loading

Chen,

Zhang

et al. 2023

Applied Sciences

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In this study, ground polymers were prepared from mudstone and slag. NaOH and water glass were used as alkaline exciters and mine waste rock aggregate was used as the aggregate for mudstone slag-based waterproof composites (MSWCs). A series of laboratory tests, including a uniaxial compression test, uniaxial cyclic loading and unloading test, scanning electron microscope test, and rock penetration test were conducted for macrostructural and microstructural analysis. The effect of the coupling between the mudstone proportion and the number of uniaxial cyclic loading and unloading tests was investigated. The results showed that it is feasible to use mudstone and slag to synthesize geopolymers, and that MSWCs fulfil the conditions for use as a reconstituted water barrier. The permeability of MSWCs with the different mudstone proportions set in this study fulfils the requirement of being used as a material, and the permeability and uniaxial compressive strength of the MSWCs gradually decreased with increases in the mudstone proportion. Considering the UCS and permeability of the MSWCs, the optimal mudstone proportion of the MSWC is r = 0.6. In this test, cyclic loading and unloading times of 0, 25, 50, and 100 were set, and with an increase of cyclic loading and unloading times, the UCS of the MSWCs showed a tendency of increasing first and then decreasing. In the SEM test, with an increase of cyclic loading and unloading times, microfractures and pores appeared in the MSWCs, which led to a gradual increase in its permeability and a decrease in its waterproofness.

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Failure mechanism of the coal wall at the working face based on an eccentric compression mechanical model

Tian,

Wang,

Wang

et al. 2024

Deep Underground Science and Engineering

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The deformation and failure of coal walls in front of a working face cause significant difficulties during mining operations. This study reveals the nonuniform distribution of bearing pressure in front of coal walls based on in situ monitoring data and numerical simulation. Therefore, an eccentric compression mechanical model was established to study the deformation and failure characteristics of a coal wall. The slenderness ratio of the compression bar is introduced to define coal walls. The results showed that instability failure occurs when λ > λc and material failure occurs when λ ≤ λc. The instability failure‐type coal wall spalling was related to the mining height, eccentricity of roof pressure, the horizontal force, and the reaction moment of the floor. The material failure‐type coal wall spalling was related to the cohesion, the internal friction angle of the coal, the upper pressure, and the horizontal force of coal walls. Unstable and destructive coal wall peeling usually occurs at a height of 0.5–0.6 times the mining height, while material damage to coal wall peeling is determined to occur within the range of 0.4–0.6 times the mining depth. The findings contribute to the understanding of the deformation and failure of coal walls.

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Experimental study on groutability and reconstructability of broken mudstone and their relationship

Cited by 8 publications

References 30 publications

Research on the Deformation and Failure Characteristics and Control Technology of Mining Area Rises under the Influence of Mining Stress

Research on the Deformation and Failure Characteristics and Control Technology of Mining Area Rises under the Influence of Mining Stress

Mechanical Properties and Penetration Characteristics of Mudstone Slag-Based Waterproof Composites under Cyclic Loading

Failure mechanism of the coal wall at the working face based on an eccentric compression mechanical model

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