Impact of water–rock interaction on the pore structures of red-bed soft rock

Zhou, Meiling; Li, Jianlin; Luo, Zuosen; Sun, Jing; Qiao, Juan; Deng, Huafeng

doi:10.1038/s41598-021-86815-w

Cited by 27 publications

(18 citation statements)

References 32 publications

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“…After touching by hand, there was a sandy feel and the phenomenon of small particles falling off. This was because water molecules in the pores and cracks of gray brick had the effect of softening the mineral skeleton, so the cement between particles underwent dissolution and dissolution reactions [ 25 , 26 , 27 ]. At the same time, minerals such as albite and anorthite in gray brick reacted with water to produce various secondary minerals, resulting in interparticle cements which gradually became detached [ 28 ].…”

Section: Resultsmentioning

confidence: 99%

Study on Deterioration of Gray Brick with Different Moisture Contents under Freeze–Thaw Environment

Yue

Zhao

et al. 2022

Materials

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Generally, brick buildings are in the open-air environment year round, and damage to them is aggravated by the effect of repeated freezing and thawing cycles. In order to determine freeze–thaw damage and deterioration mechanism, the initial moisture content of gray brick specimens was set as 20%, 40%, 60%, 80%, 100%. The effects of moisture content and the number of freeze–thaw cycles on the quality, mechanical properties and microstructure of gray brick were investigated by uniaxial compression tests and scanning electron microscopy (SEM) tests. Numerical simulations were applied to model the freezing and thawing process. The results showed that: as the number of freeze–thaw cycles increased, the mass loss rate and peak strength reduction rate of gray brick both increased. The initial moisture content had a greater impact on damage to gray brick due to freeze–thaw; ω = 80% was defined as the limit moisture content of gray brick. Under the repeated action of freeze–thaw cycles, the areas affected by thermal stress were mainly concentrated in the center of the outer surface and the center of the side of gray bricks. The maximum thermal stress after 55 freeze–thaw cycles was 1.522 × 10−2 MPa. This research results provide a theoretical basis for the prevention and protection of frost damage of brick buildings in a freeze–thaw environment.

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Section: Resultsmentioning

confidence: 99%

Study on Deterioration of Gray Brick with Different Moisture Contents under Freeze–Thaw Environment

Yue

Zhao

et al. 2022

Materials

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“…Their results show that image analysis technology plays a very important role in carbonate pore analysis. Zhou et al [ 25 ] studied the impact of water-rock interactions on the pore structures of red-bed soft rocks. Their results show that three-dimensional modelling analysis techniques play a very important role in rock pore analysis research.…”

Section: Introductionmentioning

confidence: 99%

Porosity of the porous carbonate rocks in the Jingfengqiao–Baidiao area based on finite automata

2022

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This study is based on the processing of computed microtomography images of rock samples. In this study, a finite automation is constructed using the grey value, red-green-blue (RGB) value and Euler number of polarized images of carbonate rocks from the Jingfengqiao–Baidiao area. The finite automaton is used to perform black and white binary processing of the polarized images of the carbonate rocks. The porosity of the carbonate rock is calculated based on the black and white binarization processing results of the polarized images of the carbonate rocks. The obtained porosity is compared with the carbonate porosity obtained by use of the traditional carbonate research method. When the two porosities are close, the image processing threshold of the finite automata is considered to be credible. Based on the finite automata established using the image processing threshold, the black and white binary images of the polarized images of the carbonate rocks are used to establish a rock pore image using I mage J2X. The polarized images of the carbonate rocks are classified according to their RGB values using the finite automata for the porosity classification, and the obtained images are used as textures to paste onto a cube to construct a three-dimensional data model of the carbonate rocks. This study also uses 16S rDNA analysis to verify the formation mechanism of the carbonate pores in the Jingfengqiao–Baidiao area. The results of the 16S rDNA analysis show that the pores in the carbonate rocks in the Jingfengqiao–Baidiao area are closely related to microorganisms, represented by denitrifying bacteria.

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“…The physical, chemical, and mechanical processes that occur in rocks under certain water pressure are the root cause of deformation and damage in engineering rocks, not only the mechanical effects that are simply considered from the effective stress principle [10][11][12]. The principle of water-rock action is shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties Damage, Fracture Evolution, and Constitutive Model of Siltstone under the Effect of Moisture Content

et al. 2022

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In order to study the weakening mechanism of mechanical properties and the evolution of fracture of water-bearing rocks, cylindrical standard siltstone samples with four moisture contents (0, 2.85, 3.87, and 4.25%) were prepared, and the mechanical properties, damage mode, AE characteristics, and fractal law of water-bearing rock samples were studied by means of uniaxial compression test and acoustic emission (AE) monitoring technique, and based on the test findings, a constitutive model of the entire process of rock deformation and damage under uniaxial compression was built with different moisture content of rock. The results show that with the increase of moisture content, the peak stress, the stress threshold of void compaction stage, and the stress threshold of elastic stage of the rock samples decreased linearly, elastic modulus decreased exponentially as a function, and the peak strain, the strain threshold of void compaction stage, and the strain threshold of elastic stage increased linearly. The higher the moisture content, the weaker the AE signal intensity and the smaller the AE count value. From dry to saturated, the damage form of rock samples gradually transitioned from predominantly tensile damage to predominantly shear damage. The fractal dimension of the broken block linearly decreases as the moisture content rises. The model constructed in this paper has good applicability to the deformation characteristics of water-bearing rocks under uniaxial compression before the peak stress; it especially can express the rock void compaction stage, but it cannot accurately describe the postpeak deformation characteristics.

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Impact of water–rock interaction on the pore structures of red-bed soft rock

Cited by 27 publications

References 32 publications

Study on Deterioration of Gray Brick with Different Moisture Contents under Freeze–Thaw Environment

Study on Deterioration of Gray Brick with Different Moisture Contents under Freeze–Thaw Environment

Porosity of the porous carbonate rocks in the Jingfengqiao–Baidiao area based on finite automata

Mechanical Properties Damage, Fracture Evolution, and Constitutive Model of Siltstone under the Effect of Moisture Content

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