Hydrogeochemical modelling of corrosive environment contributing to premature failure of anchor bolts in underground coal mines

Peng, Ya; Timms, Wendy

doi:10.1007/s11771-020-4393-z

Cited by 6 publications

(1 citation statement)

References 37 publications

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“…Acid erosion and a series of chemical reactions caused by it often led to the deterioration of coal, rock, support structure, etc. and induced serious safety accidents [6][7][8][9][10][11]. erefore, the research on the mechanical properties and failure mechanism of coal, rock, and structure under acid corrosion conditions has been widely concerned by scholars [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Three‐Dimensional Reconstruction and Numerical Simulation Analysis of Acid‐Corroded Sandstone Based on CT

Miao

Xie

et al. 2021

Shock and Vibration

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Due to its unique technological characteristics, coal mining and production often encounter an acid corrosion environment caused by acid gases. Acid erosion and a series of chemical reactions caused by it often led to the deterioration of coal, rock, support structure, etc. and induced serious safety accidents. To further explore the macro-mesoscopic damage evolution law and failure mechanisms of rock masses under corrosion conditions through numerical simulation, a zonal refined numerical model that can reflect the acid corrosion characteristics of sandstone is established based on CT and digital image processing (DIP). The uniaxial compression test of corroded sandstone is simulated by ABAQUS software. Comparing the numerical simulation results with the physical experiment results, we found that the three-dimensional finite element model based on CT scanning technology can genuinely reflect sandstone’s corrosion characteristic. The numerical simulation results of the stress-strain curve and macroscopic failure mode of the acid-corroded sandstone are in good agreement with the experimental results, which provides a useful method for further studying the damage evolution mechanism of the acid-corroded rock mass. Furthermore, the deformation and damage evolution law of the corroded sandstone under uniaxial compression is qualitatively analyzed based on the numerical simulation. The results show that the rock sample’s axial displacement decreases gradually from top to bottom under the axial load, and the vertical variation is relatively uniform. In contrast, the rock sample’s removal gradually increases with the increase of axial pressure, and the growth presents a certain degree of nonuniformity in the vertical. The acid-etched rock sample’s damage starts from both the end and the middle; it first appears in the corroded area. Moreover, with the displacement load increase, it gradually develops and is merged in the middle of the rock sample and forms macroscopic damage.

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Section: Introductionmentioning

confidence: 99%

Three‐Dimensional Reconstruction and Numerical Simulation Analysis of Acid‐Corroded Sandstone Based on CT

Miao

Xie

et al. 2021

Shock and Vibration

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Experimental and modeling investigation of dual-source iron release in water–solid–gas interaction of abandoned coal mine drainage

Zhou,

Ye,

Zheng

et al. 2023

Environ Geochem Health

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Multi-scale experimental study on the failure mechanism of high-strength bolts under highly mineralized environment

He,

Zhang,

Xie

et al. 2024

Geomech. Geophys. Geo-energ. Geo-resour.

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High-strength bolts have become indispensable support materials in geotechnical engineering, but the incidence of safety accidents caused by bolt fractures under complex geological conditions is increasing. To address this challenge, this study focuses on a typical roadway in the Xinjulong coal mine, employing a combination of mechanical performance testing, microscopic and macroscopic analyses to investigate the failure mechanism of bolt breakage. The research indicates that the cracks in the failed bolts underground exhibit subcritical patterns, with the presence of oxides and Cl elements, and multiple intergranular fractures internally, consistent with the characteristics of stress corrosion failure. Additionally, inherent defects in the bolts are also a primary cause of failure. For instance, for type A bolts, the levels of P and S elements significantly exceed the normative requirements, forming inclusions, while the low content of elements like Si and V leads to reduced plasticity, toughness, and corrosion resistance. Furthermore, the excessive pitch in type A bolts leads to stress concentration and cracking under complex loads. The study concludes that the synergistic effect of stress corrosion cracking and inherent flaws in bolts are the main causes of failure. Therefore, it is recommended to enhance the reliability and safety of bolt support by optimizing the bolt shape and developing anti-corrosion bolts, thereby achieving long-term stability in underground engineering.

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Hydrogeochemical modelling of corrosive environment contributing to premature failure of anchor bolts in underground coal mines

Cited by 6 publications

References 37 publications

Three‐Dimensional Reconstruction and Numerical Simulation Analysis of Acid‐Corroded Sandstone Based on CT

Three‐Dimensional Reconstruction and Numerical Simulation Analysis of Acid‐Corroded Sandstone Based on CT

Experimental and modeling investigation of dual-source iron release in water–solid–gas interaction of abandoned coal mine drainage

Multi-scale experimental study on the failure mechanism of high-strength bolts under highly mineralized environment

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