Dynamic Behaviour and Energy Evolution of Granite in a Tunnel Under Cyclic Impact Loading

Wang, Xinyu; Dong, Bin; Gao, Xicai; Li, Pengfei; Wang, Shuren; Hu, Bin

doi:10.1007/s00603-023-03537-3

Cited by 2 publications

(1 citation statement)

References 67 publications

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“…The distribution of pore sizes ranges from millimeters to nanometers [1,2], spanning multiple scales, directly impacting the adsorption and fluidity of coalbed methane [3]. The complex pore networks within coal play a crucial role in controlling the occurrence and migration of coalbed methane, with factors such as development degree, porosity, pore number, distribution, and connectivity influencing both abnormal methane enrichment and mine safety [4,5]. Furthermore, studying the coal pore structure is of great significance for understanding the occurrence and migration of coalbed methane and optimizing its exploitation.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Characterization of Micro–Nano Pores in Coal Reservoirs of Different Coal Ranks

Song,

Yue,

Liu

2024

Applied Sciences

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Coalbed methane represents a promising source of clean and efficient unconventional energy. The intricate network of micro–nano pores within coal serves as the primary adsorption space for gas, contributing to the complexity of gas migration channels. In this study, based on the box-counting method, three coal samples representing low, medium, and high ranks were subjected to high-precision micro-CT scanning and nano-CT scanning to generate three-dimensional (3D) pore network models using Avizo visualization software. This facilitated the accurate and quantitative characterization of the micro–nano pore structures within coal reservoirs. The results indicated that the face rate distribution range of each sample was large, indicating relatively strong heterogeneity in each sample. The volume fractal dimension of each sample, determined through micro–nano-CT scanning, was around 2.5, while the surface fractal dimension exhibited oscillatory characteristics with moderate uniformity. The pore equivalent radius and throat equivalent radius distributions were unimodal across all the samples, with the micro-CT scanning revealing a concentration primarily within the range of 100–400 μm for the pore equivalent radius and within 200 μm for the throat equivalent radius. Conversely, the nano-CT scanning exhibited concentrations primarily within the range of 500–2500 nm for the pore equivalent radius and within 2000 nm for the throat equivalent radius. The analysis of the 3D reconstruction structures indicated that the middle-rank coal exhibited more developed large–medium pores compared with the low-rank and high-rank coal, while the low-rank and high-rank coal exhibited relatively more micro–small pores. Furthermore, the low-rank coal exhibited the fewest number of pores but the largest average pore equivalent radius and throat radius. Additionally, the middle–high-rank coal exhibited a relatively larger number of pores. Despite the complex topological structures observed in each sample, a significant proportion indicated a coordination number of 0–20, indicating excellent connectivity within the coal samples. This study is conducive to the optimization of coalbed methane surface development blocks and the formulation of reasonable development plans.

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Section: Introductionmentioning

confidence: 99%

Analysis and Characterization of Micro–Nano Pores in Coal Reservoirs of Different Coal Ranks

Song,

Yue,

Liu

2024

Applied Sciences

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Evolution of Pore Structure and Fractal Characteristics in Red Sandstone under Cyclic Impact Loading

Qiao,

Wang,

Jiang

et al. 2024

Fractal Fract

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Fatigue damage can occur in surface rock engineering due to various factors, including earthquakes, blasting, and impacts. The underlying cause for the variations in physical and mechanical properties of the rock resulting from impact loading is the alteration in the internal pore structure. To investigate the evolution characteristics of the pore structure under impact fatigue damage, red sandstone subjected to cyclic impact compression by split Hopkinson pressure bar (SHPB) was analyzed using nuclear magnetic resonance (NMR) technology. The parameters describing the evolution of pore structure were obtained and quantified using fractal methods. The development of the pore structure in rocks subjected to cyclic impact was quantitatively analyzed, and two fractal evolution models based on pore size and pore connectivity were constructed. The results indicate that with an increasing number of impact loading cycles, the porosity of the red sandstone gradually increases, the T2 cutoff (T2c) value decreases, the most probable gray value of magnetic resonance imaging (MRI) increases, the pores’ connectivity is enhanced, and the fractal dimension decreases gradually. Moreover, the pore distribution space tends to transition from three-dimensional to two-dimensional, suggesting the expansion of dominant pores into clusters, forming microfractures or even macroscopic fissures. The findings provide valuable insights into the impact fatigue characteristics of rocks from a microscopic perspective and contribute to the evaluation of time-varying stability and the assessment of progressive damage in rock engineering.

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Dynamic Behaviour and Energy Evolution of Granite in a Tunnel Under Cyclic Impact Loading

Cited by 2 publications

References 67 publications

Analysis and Characterization of Micro–Nano Pores in Coal Reservoirs of Different Coal Ranks

Analysis and Characterization of Micro–Nano Pores in Coal Reservoirs of Different Coal Ranks

Evolution of Pore Structure and Fractal Characteristics in Red Sandstone under Cyclic Impact Loading

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