Study on large deformation mechanism and concrete-filled steel tubular support technology for ventilation shaft roadway

Zuo, Jianping; Liu, Haiyan; Liu, Dejun; Wang, Jun; Zhang, Tangliang; Xu, Fei

doi:10.1007/s10064-021-02331-1

Cited by 10 publications

(2 citation statements)

References 29 publications

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“…rough numerical simulations, Li [14] investigated the influence of different factors (arch height, pillar height, pillar width, and mechanical characteristics) on the ultimate bearing capacity of hyperbolic pillars at high temperatures and proposed a stability evaluation method. Moreover, innovation and stability analysis of coal columns have been studied by some scholars [15][16][17][18][19][20][21][22][23] Although studies have primarily focused on the impacts of high temperatures on the surrounding rock in underground coal gasifier cavities, most of the studies only considered traditional rectangular gasifier cavities; consequently, the surrounding rock failure and reasonable coal pillar width of drop-shaped gasifier cavities have not been sufficiently analysed.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Coal Pillar Stability between Different Shapes of Gasifier Cavities under High Temperatures during UCG

et al. 2022

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The shape of the gasifier cavity and the high temperatures induced by underground coal gasification (UCG) have a significant influence on the failure characteristics of the surrounding rock. In this study, the variations in the mechanical properties of the surrounding rock in gasifier cavities subjected to different temperatures (20–700°C) were obtained experimentally, and the results were used to establish numerical models. FLAC3D was used to analyse the failure of the surrounding rock in drop-shaped and traditional rectangular gasifier cavities. The mechanical parameters of the surrounding rock in the numerical model were assigned a gradient distribution based on the temperature propagation law and the experimental results. The results revealed that the temperature of the surrounding rock has a significant influence on the coal pillar stability, and the surrounding rock primarily undergoes shear failure. As the temperature of the surrounding rock increases, the width of the stable coal pillar increases exponentially; the reasonable widths for coal pillars between adjacent drop-shaped gasifier cavities are 12 m (room temperature), 17 m (700°C and 850°C), 18 m (1000°C), 19 m (1150°C), and 20 m (1300°C). In contrast, the reasonable width of coal pillars in traditional rectangular gasifier cavities is approximately 21 m, which is significantly higher than that for drop-shaped gasifier cavities.

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Section: Introductionmentioning

confidence: 99%

Investigation on Coal Pillar Stability between Different Shapes of Gasifier Cavities under High Temperatures during UCG

et al. 2022

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“…Wei et al 11 studied the bending fracture mechanical behavior and acoustic emission characteristics of sandstones with different grain sizes, and found that the peak load and fracture toughness gradually decreased and the number of acoustic emission events gradually increased with the increase of rock particle size. Zuo et al 12,13 studied the influence of loading rate on acoustic emission (AE) characteristics of sandstone failure and micromorphology of the fracture surface, and found that the number of AE ringing decreased with the increase of loading rate. The proportion of meso transgranular fracture increases with the increase of loading rate.…”

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Study on the evolutionary characteristics of strain energy on crack propagation in coal and rock under bending load

Zhang,

Gong

et al. 2024

Energy Science & Engineering

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The failure of coal mine overburden is mainly caused by fractures under bending loads. The energy evolution characteristics of coal and rock fractures are closely related to coal mine disasters such as rock burst. To obtain the characteristics of energy release and accumulation of coal and rock under bending load, three‐point bending tests of coal, mudstone, and sandstone were carried out respectively. The strength characteristics and fracture propagation process of coal and rock under bending load were studied. The strain energy evolution rules of coal and rock were calculated and obtained. The fracture mechanism of coal and rock was discussed by analyzing the critical strain energy release rate. The results show that the fracture complexity of sandstone and mudstone is greater than that of coal. The microstructure and its directivity in coal and rock indirectly affect their fracture characteristics through the elastic modulus characteristics. The distribution of parameters such as peak load of fracture, fracture energy, and crack length of coal and mudstone samples is discrete, while that of sandstone samples is concentrated. The deformation energy density of coal and rock basically shows a linear increase trend at the prepeak stage. The deformation energy density evolution characteristics at the postpeak stage are mainly affected by the load drop. It is important to establish the internal relationship between the meso structural characteristics and macro mechanical properties for solving engineering problems.

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Non-orthogonal Failure Behavior of Roadway Surrounding Rock Subjected to Deep Complicated Stress

Zuo

Zhu

et al. 2023

Rock Mech Rock Eng

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Study on large deformation mechanism and concrete-filled steel tubular support technology for ventilation shaft roadway

Cited by 10 publications

References 29 publications

Investigation on Coal Pillar Stability between Different Shapes of Gasifier Cavities under High Temperatures during UCG

Investigation on Coal Pillar Stability between Different Shapes of Gasifier Cavities under High Temperatures during UCG

Study on the evolutionary characteristics of strain energy on crack propagation in coal and rock under bending load

Non-orthogonal Failure Behavior of Roadway Surrounding Rock Subjected to Deep Complicated Stress

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