Abstract
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.
Highlights
With the development of the economy, the scale of engineering construction such as deep earth resource exploitation, railway tunnel infrastructure construction, and urban underground space development continues to increase worldwide. e safety problems caused by the corresponding complex engineering-geological environment have become increasingly prominent [1,2,3,4,5]
Erefore, in this paper, a partitioned finite element model that can reflect the acid corrosion characteristics of sandstone is established based on CT and digital image processing (DIP). e uniaxial compression test of corroded sandstone is simulated by ABAQUS software
Deformation and Damage Evolution Analysis Based on Numerical Simulation. e feasibility of the model was verified by the comparison between the numerical simulation and physical experiment. erefore, based on the established numerical model, the displacement and damage evolution law of acid corroded sandstone under uniaxial compression load are further analyzed. e corresponding results are shown in Figures 15 and 16. e figure shows that the rock sample’s axial displacement decreases gradually from top to bottom under the axial load, and the vertical variation is relatively uniform. e maximum displacement appears at the top of the rock sample
Summary
With the development of the economy, the scale of engineering construction such as deep earth resource exploitation, railway tunnel infrastructure construction, and urban underground space development continues to increase worldwide. e safety problems caused by the corresponding complex engineering-geological environment have become increasingly prominent [1,2,3,4,5]. E safety problems caused by the corresponding complex engineering-geological environment have become increasingly prominent [1,2,3,4,5] Due to their unique technological characteristics, coal mining and production often encounter an acid corrosion environment caused by acid gases. Feng et al [20] applied the CT real-time scanning technology to study the mesomechanism of the sandstone’s failure under triaxial compression and chemical erosion and established the corresponding damage variable model. Erefore, it is necessary to explore a refined numerical model that can accurately reflect rock mass internal structure changes under acidic corrosion and further reveal the macro-mesoscopic damage evolution laws and failure mechanisms of rock masses under corrosive conditions through the corresponding numerical experiments. The deformation and damage evolution law of the corroded sandstone during uniaxial compression were studied based on the numerical simulation
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