Research on grouting reinforcement technology of fault crossing roadway in fully mechanized mining face with large dip angle

Pan, Weipeng; Li, Huaibin; Hua, Xinzhu; Liu, Bin; Li, Chen

doi:10.1007/s10064-024-03731-9

Bull Eng Geol Environ

2024

DOI: 10.1007/s10064-024-03731-9

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Research on grouting reinforcement technology of fault crossing roadway in fully mechanized mining face with large dip angle

Weipeng Pan,

Huaibin Li,

Xinzhu Hua

et al.

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Cited by 3 publications

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A method for assessing the risk of rockburst based on coal-rock mechanical properties and In-Situ ground stress

Rong,

Li,

Cao

et al. 2024

Sci Rep

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With the increase in mining depth and intensity, dynamic disasters such as rockburst in mines are becoming more severe. Deep resource extraction is characterized by a high in-situ stress geological environment, closely associated with geological dynamic disasters. However, there is currently no quantitative analysis method for the correlation between the two. In this study, an elastic energy density calculation method is employed, considering the dissipative effect of the self-weight stress field on the tectonic stress field. The remaining energy, referred to as impact energy, is used to classify the risk of coal seam impact, providing a computational method for rapid assessment of impact risk before mining production. The proposed calculation method is compared with 22 mine impact engineering practices in the literature, showing accurate predictions for 21 mines. Since measuring in-situ stress and coal seam physical and mechanical properties is a preliminary work in coal seam extraction, the comprehensive analysis of these data holds significant research and practical value.

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A method for assessing the risk of rockburst based on coal-rock mechanical properties and In-Situ ground stress

Rong,

Li,

Cao

et al. 2024

Sci Rep

View full text Add to dashboard Cite

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Study on instability mechanisms and control of coal pillar spalling and coal crumbs leakage during working face crossing faults

Zhao,

Wang,

Bai

et al. 2024

Sci Rep

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The stability of coal pillars in fault areas is crucial for ensuring the safe passage of working faces. Based on field observations, frequent coal pillar spalling and substantial tectonic coal crumbs leakage, as well as tilting of hydraulic supports, are observed when working faces transition from primary coal to tectonic coal. To analyze the instability mechanisms behind these phenomena, this paper establishes a mechanical model of coal pillars in fault areas and analyzes the distribution of tectonic stresses and factors affecting the stability of coal pillars. The results indicate that horizontal tectonic stress adheres to an exponential function dependent on the angle factor, where ( k 0 ) is a parameter associated with the friction angle of the coal body, the dip angle of the fault, and the friction angle of the fault plane. The stability of coal pillars is influenced by factors such as roof and floor pressures, coal pillar integrity, mining height, and shield support force, with coal pillar integrity being the most critical. To ensure the smooth passage of working faces through faults, this study proposes a combined control technique of “inclined mining” and “grouting,” including reducing mining heights, adjusting the slope of working face advancement, and pre-grouting of coal pillars. Industrial experiments conducted on-site have shown improved integrity of tectonic coal, enabling the working face to pass through faults smoothly and significantly increasing production efficiency.

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Numerical Simulation and Engineering Application of Temporary Stress Field in Coal Mine Roadway

Zhang,

Ma,

Wang

et al. 2024

Applied Sciences

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The imbalance between excavation and mining is significant as it restricts the efficient development of coal resources. Slow tunneling speed is primarily due to the inability to concurrently conduct excavation and permanent support operations, and temporary support is considered a key solution to this problem. However, the mechanism by which temporary support affects the surrounding rock in unsupported are as remains unclear, hindering the assurance of stability in these areas and the determination of a reasonable unsupported span. To address this issue, this work proposed a stress distribution model as temporary support, elucidating the distribution law of support forces within the surrounding rock. By analyzing the stress differences between areas with and without temporary support, the stress field distribution characteristics of temporary support were determined. Subsequently, the evolution of stress and strain in the surrounding rock within unsupported areas was analyzed concerning changes in temporary support length, support force, and unsupported distance. The results indicated that, although temporary support does not directly act on unsupported areas, it still generates a supportive stress field within them. The maximum unsupported distance should not exceed 3 m, and there is a strong linear relationship between the optimal temporary support force and the unsupported span. Furthermore, the length of temporary support should not exceed 17 m from the tunnel face. The successful application of the shield tunneling robot system verifies that temporary support can ensure the stability of the surrounding rock in unsupported areas, confirming the validity of the temporary support stress distribution model. This research can be used to design and optimize cutting parameters and temporary support parameters, arrange equipment, and design and optimize tunnel excavation processes to achieve safe and efficient tunneling.

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Research on grouting reinforcement technology of fault crossing roadway in fully mechanized mining face with large dip angle

Cited by 3 publications

References 6 publications

A method for assessing the risk of rockburst based on coal-rock mechanical properties and In-Situ ground stress

A method for assessing the risk of rockburst based on coal-rock mechanical properties and In-Situ ground stress

Study on instability mechanisms and control of coal pillar spalling and coal crumbs leakage during working face crossing faults

Numerical Simulation and Engineering Application of Temporary Stress Field in Coal Mine Roadway

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