NMR, MRI and AE Statistical Study of Damage due to a Low Number of Wetting–Drying Cycles in Sandstone from the Three Gorges Reservoir Area

Xie, Kainan; Jiang, Deyi; Sun, Zhongguang; Chen, Jie; Zhang, Wengang; Jiang, Xiang

doi:10.1007/s00603-018-1562-6

Cited by 42 publications

(11 citation statements)

References 22 publications

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“…Periodic changes of water levels in reservoirs causes wet cycle damage of reservoir rocks. The Three Gorges Reservoir was formed by the construction of China's Three Gorges Dam, the world's largest water conservancy project, which contains changes of water levels by nearly 30 m. Xie et al used the typical sandstone in the Three Gorges Reservoir Area to measure acoustic emission and nuclear magnetic resonance images to study the dry-wet cycle damage [82]. The internal damage of sandstone caused by dry-wet cycles is best seen by nuclear magnetic imaging.…”

Section: Damage Of Wetting-drying Cycles In Sandstonementioning

confidence: 99%

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Acoustic Emission Spectroscopy: Applications in Geomaterials and Related Materials

et al. 2021

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As a non-destructive testing technology with fast response and high resolution, acoustic emission is widely used in material monitoring. The material deforms under stress and releases elastic waves. The wave signals are received by piezoelectric sensors and converted into electrical signals for rapid storage and analysis. Although the acoustic emission signal is not the original stress signal inside the material, the typical statistical distributions of acoustic emission energy and waiting time between signals are not affected by signal conversion. In this review, we first introduce acoustic emission technology and its main parameters. Then, the relationship between the exponents of power law distributed AE signals and material failure state is reviewed. The change of distribution exponent reflects the transition of the material’s internal failure from a random and uncorrelated state to an interrelated state, and this change can act as an early warning of material failure. The failure process of materials is often not a single mechanism, and the interaction of multiple mechanisms can be reflected in the probability density distribution of the AE energy. A large number of examples, including acoustic emission analysis of biocemented geological materials, hydroxyapatite (human teeth), sandstone creep, granite, and sugar lumps are introduced. Finally, some supplementary discussions are made on the applicability of Båth’s law.

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Section: Damage Of Wetting-drying Cycles In Sandstonementioning

confidence: 99%

“…The jerk spectrum is shown in Figure 13a. Reproduced with permission from [82]. Springer Nature, 2018.…”

Section: Avalanches In Sugar Lumpsmentioning

confidence: 99%

Acoustic Emission Spectroscopy: Applications in Geomaterials and Related Materials

et al. 2021

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“…Rock is the most common geological material in projects such as oil and gas development, coal mining, and hydroelectric power generation. In engineering practice, rocks are commonly affected by dry and wet cycles, for example, the surrounding rock of reservoir bank slope engineering by the influence of daily and seasonal changes of water level (see Figure 1) [1][2][3][4]; the thin granite veneer cladding panels installed on the exterior of buildings subjected to environmental weathering [5]; tunnel excavation under the influence of groundwater level fluctuation [6]; the slope stability of open-pit coal mine affected by rainfall (see Figure 2) [7]; the tailings pond by the impact of abandoned tailings discharge and pumping [8]; the swelling rock of the base and slope of the water conveyance channel (see Figure 3) [9][10][11]; the coastal rock masses affected by tides [12][13][14][15]; the stone monuments, sculptures, and historical sites affected by acid rain erosion [16,17]; the subgrade and surrounding rock of railway tunnel [18]; the retaining dam of an under-ground reservoir [19]. After the dry-wet cycle, the physical and mechanical properties of the rock will change to varying degrees, and the changes are very important to the design, construction, and operation of rock projects.…”

Section: Introductionmentioning

confidence: 99%

Deterioration of Physical and Mechanical Properties of Rocks by Cyclic Drying and Wetting

et al. 2021

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Both surface and underground rocks in nature often undergo repeated drying and wetting. The dry-wet cycle is a weathering effect that includes physical and chemical processes, which has varying degrees of degradation effects on the physical and mechanical properties of rocks. This paper analyzes and discusses this kind of rock degradation based on the existing literature data. First, the deterioration degree of various physical and mechanical properties (including density, P-wave velocity, porosity, static and dynamic compressive/tensile strength, and fracture toughness) is summarized as the number of dry-wet cycles increases. Secondly, the possible degradation mechanism of the dry-wet cycle is explained in terms of clay mineral swelling, solute migration, and microcrack evolution. Then, the damage constitutive model of the rock after cyclic dry-wet treatment is introduced. Finally, the issues that need to be studied in the future are put forward.

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“…Fractured sections of the rock are examined using advanced instruments such as nuclear magnetic resonance imagers to obtain mesostructural changes for different cyclic invasion conditions and produce a qualitative analysis of the mesodamage. Using digital image recognition technology, mesostructural information, such as fractal dimension and porosity, is extracted to quantitatively characterize the mesostructural damage [3,[13][14][15][16]. Results show that cyclic water intrusion affects the strength and structure of rocks and adversely affects the stability of the project.…”

Section: Introductionmentioning

confidence: 99%

A Damage Constitutive Model of Rock under Hydrochemical Cyclic Invasion

Sun

Qin

Wang

et al. 2020

Advances in Civil Engineering

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In order to analyze the stability of water-related materials, the deterioration and damage of rock strength due to circulating water intrusion in an open tailings pond were studied. Uniaxial compression tests were carried out for rocks under different hydrochemical environments and varying numbers of invasion cycles. Results show that, with increasing number of cycle times, rock peak strength and elastic modulus gradually decrease and the acidity and alkalinity of the soaking solution also degrades rock strength. The curve of the number of cycles, acidity, alkalinity, peak strength, and elastic modulus is fit numerically. Based on the principle of damage mechanics, a hydraulic-chemistry-mechanics (HCM) coupling damage variable is defined. Based on the theory of microbody strength distribution, the constitutive equation for rock damage under the coupled effect of water chemistry and cyclic water invasion is established. The results verify the validity of the established damage constitutive model.

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NMR, MRI and AE Statistical Study of Damage due to a Low Number of Wetting–Drying Cycles in Sandstone from the Three Gorges Reservoir Area

Cited by 42 publications

References 22 publications

Acoustic Emission Spectroscopy: Applications in Geomaterials and Related Materials

Acoustic Emission Spectroscopy: Applications in Geomaterials and Related Materials

Deterioration of Physical and Mechanical Properties of Rocks by Cyclic Drying and Wetting

A Damage Constitutive Model of Rock under Hydrochemical Cyclic Invasion

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