Stability analysis of hyperbolic coal pillars with peeling and high temperature effects

Xu, Yue; Li, Huaizhan; Guo, Guangli; Liu, Xiaopeng

doi:10.1177/0144598720933515

Cited by 3 publications

(2 citation statements)

References 18 publications

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“…As a result of the high temperature, the roof rocks, in particular claystone, can fall downwards, making it possible for gases to migrate into the rock mass and cause an increase in the temperature of the surrounding rocks. Moreover, as a result of high temperature, the geometry of the carbon pillars changes, which translates into an increase and change in the stress distribution around the gasification channel [50].…”

Section: Discussionmentioning

confidence: 99%

Determination of the Extent of the Rock Destruction Zones around a Gasification Channel on the Basis of Strength Tests of Sandstone and Claystone Samples Heated at High Temperatures up to 1200 °C and Exposed to Water

2021

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This article presents the results of laboratory tests regarding the influence of high temperatures on changes in the strength and structural parameters of rocks that are present in the immediate vicinity of a gasification channel. Sandstone and claystone samples were heated at 300 °C, 600 °C, 900 °C and 1200 °C. Additionally, the heated samples were placed in water for 24 h. The results of the laboratory tests were used in the numerical simulation using RS2 software. The main goal of modeling was to determine the extent of the rock destruction zone around the gasification channel for dry and wet rock masses. In the numerical simulations, three widths of the gasification channel and three ranges of high-temperature impact were modeled. On the basis of the obtained results, it was found that the extent of rock destruction, both in the roof and in the floor, is greater by several percent for a wet rock mass. For the first time, this research presents the effect of water on heated rock samples in terms of the underground coal gasification process. The results of laboratory tests and numerical simulations clearly indicate a reduction in strength, deformation and structural parameters for the temperature of 1200 °C.

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Section: Discussionmentioning

confidence: 99%

Determination of the Extent of the Rock Destruction Zones around a Gasification Channel on the Basis of Strength Tests of Sandstone and Claystone Samples Heated at High Temperatures up to 1200 °C and Exposed to Water

2021

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“…e gob-side entry driving is a long-walled coal mining often used in the form of exploitation [21][22][23][24][25], and the roadway driving with coal pillars can effectively isolate the goaf to prevent water and harmful gases in the goafs into the roadway [26,27]. Feng et al [28] established the relationship between microseismicity and the risk of rockburst and then proposed an early warning technique based on it to predict the rockburst in tunnels.…”

Section: Introductionmentioning

confidence: 99%

Seismic Response Analysis of Deep Underground Roadways and Coal Pillars under the Influence of the Adjacent Goaf

Cao

Han

2021

Advances in Civil Engineering

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In this work, a numerical study is conducted on the seismic response of deep-buried roadways in coal mines under the influence of goafs, and a 3D numerical model of the seismic response simulation of deep-buried roadways is established using the coupling model of the finite difference method and the distinct element method. This model simulates the seismic response of different coal pillar widths and the seismic conditions of the deep-buried roadways under the influence of the adjacent goafs. The deformation, stress distribution, and plastic area distribution of roadways and coal pillars are systematically studied, and the situations under the static load and the roadways, which are not affected by the goafs, are compared and analyzed. A reasonable width of the coal pillar is proposed on the basis of the stability of the roadway and the coal pillars. In the end, suggestions for the reasonable setting of coal pillars under seismic load are provided.

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Research on Factors Affecting Mine Wall Stability in Isolated Pillar Mining in Deep Mines

Guo

Cheng

Lu³

et al. 2022

Minerals

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This study takes the Dongguashan Copper Mine as its engineering background. Based on the mechanical model of the mine wall under the trapezoidal load of the backfill, a comprehensive evaluation index is proposed, and its calculation equation is derived. On this basis, an orthogonal test is designed to explore the influence of mining design parameters on mine wall stability. The results show that the width of the mine wall is the main factor affecting its stability, and increasing the width of the mine wall can significantly improve its stability. When the width of the mine wall is kept above 4 m, its stability is better. When the mechanical parameters of the backfill are poor, the mine wall is prone to overturning failure. The width of the mine room has an influence on the multi-directional loading of the mine wall, but the influence on the stability of the mine wall is low. According to the regression equation calculation, the mine wall safety factor is about 1.46 under the design of G5 mining of Dongguashan Line 52, the stability of the mine wall is good after actual mining and the engineering application effect is ideal, which can provide a theoretical basis for the design of isolation pillar mining in deep mines.

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Stability analysis of hyperbolic coal pillars with peeling and high temperature effects

Cited by 3 publications

References 18 publications

Determination of the Extent of the Rock Destruction Zones around a Gasification Channel on the Basis of Strength Tests of Sandstone and Claystone Samples Heated at High Temperatures up to 1200 °C and Exposed to Water

Determination of the Extent of the Rock Destruction Zones around a Gasification Channel on the Basis of Strength Tests of Sandstone and Claystone Samples Heated at High Temperatures up to 1200 °C and Exposed to Water

Seismic Response Analysis of Deep Underground Roadways and Coal Pillars under the Influence of the Adjacent Goaf

Research on Factors Affecting Mine Wall Stability in Isolated Pillar Mining in Deep Mines

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