Quantitative Analysis of the Topological Structure of Rock Pore Network

Ye, Dayu; Liu, Guannan; Luo, Ning; Gao, Feng; Zhu, Xinmin

doi:10.1155/2021/5517489

Cited by 7 publications

(2 citation statements)

References 38 publications

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“…Additionally, the anisotropy of the pore structure of a certain hydrostatic pressure is expressed by the anisotropy of elastic wave velocity [6]. On the basis of CT scanning, the distribution characteristics of rock pore grids are quantitatively analyzed by introducing complex grid theory, and the connectivity changes of rock pore grids are studied [7]. Based on MIP tests and image analysis technology, the fractal characteristics of tight sandstone's pore structure are studied [8].…”

Section: Introductionmentioning

confidence: 99%

Study on Pore Structure Evolution Characteristics of Weakly Cemented Sandstone under Freeze–Thaw Based on NMR

Lin

Yang²,

Yin³

et al. 2023

Water

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Taking saturated, weakly cemented sandstone as the research object, nuclear magnetic resonance (NMR) tests were performed before and after six freeze–thaw cycles without water replenishment in order to study and reveal the evolution characteristics of the pore structure of weakly cemented sandstone under a freeze–thaw cycle. The evolution of pore structure under repeated freeze–thaw cycles was studied using T2 fractal theory and spectral peak analysis. The results show that the evolution of the pore structure of weakly cemented sandstone can be divided into three stages during the freeze–thaw cycle. In stage 1, the rock skeleton can still significantly restrict frost heave, and the effect of rock pore expansion occurs only on the primary pore scale, primarily in the transformation between adjacent scales. In stage 2, as the restraint effect of the skeleton on frost heave decreases, small-scale secondary pores are gradually produced, pore expansion occurs step by step, and its connectivity is gradually enhanced. In stage 3, as rock pore connectivity improves, the effect of pore internal pressure growth in the freezing process caused by water migration is weakened, making it impossible to break through the skeleton constraint. Thus, it becomes difficult for freezing and thawing to have an obvious expansion effect on the rock pore structure. The strength of the freeze–thaw cycle degradation effect is determined by the effect of the rock skeleton strength under the freeze–thaw cycles and the connectivity of small-scale pores in the rock. The lower the strength of the rock skeleton, the worse the connectivity of pores, and the more obvious the freeze–thaw degradation effect, and vice versa.

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Section: Introductionmentioning

confidence: 99%

Study on Pore Structure Evolution Characteristics of Weakly Cemented Sandstone under Freeze–Thaw Based on NMR

Lin

Yang²,

Yin³

et al. 2023

Water

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“…The microstructure of rock, especially the pore structure, can seriously affect its water absorption. After it absorbs the water, the microstructure of the rock is damaged [15][16][17]. In addition, different hydrochemical environments also have important effects on the expansion and contraction of mudstone, including temperature, pH value, and ion concentration [18,19].…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Deformation Characteristics and Energy Analysis of Mudstone under Water Absorption Process

Feng

Luo

et al. 2022

Energies

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In geological engineering, a series of safety problems caused by expansive mudstone are common, such as slope instability and roadbed up-arch. In this paper, the mineral composition of mudstones in the Xining area was analyzed by X-ray diffraction (XRD), and the microstructural and morphological changes of mudstones after water absorption were observed by scanning electron microscopy (SEM) test to analyze the internal factors and microstructural evolution patterns of water absorption and swelling of mudstones. Based on the microstructural units, the mudstones were defined into two categories, one is N-type mudstone with flat sheet-like stromatolite units, and the other is SN-type mudstone with more clastic particle units. Water absorption experiments were conducted on the rock samples to study the microstructure of these two types of mudstones under different water absorption conditions. The pore characteristics of the mudstones were analyzed by using Image-Pro Plus to reveal the water absorption mechanism. The results show that the pore area of N-type mudstone is smaller, as well as the distribution of pore diameter. The pore area of N-type mudstone develops rapidly, in the early stage of water absorption, lots of pores are produced, and the pore area of SN-type mudstone shows an overall decreasing trend. The pore area and the number of SN-type mudstones are at a low level after full water absorption. Under the condition of full immersion, water enters the pores rapidly and soluble salts are dissolved in large quantities. The change of water absorption rate of mudstone with time can be divided into the stage of sudden increase, decrease and stability of water absorption rate. Then, based on the stress theory, the relationship between the macroscopic expansion process and the microstructure of mudstone was analyzed. Finally, the energy basis of mudstone water absorption is discussed. In the swelling of mudstone, the energy gradually turns into swelling strain energy.

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A new approach to evaluate the interactions between the surrounding rock microstructure and water inrush for tunnel excavation

Liu

et al. 2023

Computers and Geotechnics

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Quantitative Analysis of the Topological Structure of Rock Pore Network

Cited by 7 publications

References 38 publications

Study on Pore Structure Evolution Characteristics of Weakly Cemented Sandstone under Freeze–Thaw Based on NMR

Study on Pore Structure Evolution Characteristics of Weakly Cemented Sandstone under Freeze–Thaw Based on NMR

Microstructure, Deformation Characteristics and Energy Analysis of Mudstone under Water Absorption Process

A new approach to evaluate the interactions between the surrounding rock microstructure and water inrush for tunnel excavation

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