Freeze-thaw damage evolution of fractured rock mass using nuclear magnetic resonance technology

Liu, Taoying; Zhang, Chaoyang; Cao, Ping; Zhou, Keping

doi:10.1016/j.coldregions.2019.102951

Cited by 62 publications

(26 citation statements)

References 28 publications

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“…Petrophysical property characterization Uncertainty T 2cutoff Reducing uncertainty of relaxation parameters like T 2cutoff , and increasing calibration Different sources produce identical NMR response, causing signal overlapping Removement of identical signal achieved by NMR tests, by using different pulse sequences Pore structure characterization Enhancing signal change contrast, and combing NMR techniques with other imaging measurements like SEM and CT like core imbibition, flooding, excavation, centrifugation, or freezing-thawing cycles (Liu et al 2019), with NMR techniques, to reflect fluid transportation laws and distribution variations, and observe the evolution of pore structure. This requires reasonable experimental design and integrated protocol.…”

Section: Issue Type Ideas and Approachesmentioning

confidence: 99%

Advances in low-field nuclear magnetic resonance (NMR) technologies applied for characterization of pore space inside rocks: a critical review

et al. 2020

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NMR serves as an important technique for probing rock pore space, such as pore structure characterization, fluid identification, and petrophysical property testing, due to the reusability of cores, convenience in sample processing, and time efficiency in laboratory tests. In practice, NMR signal collection is normally achieved through polarized nuclei relaxation which releases crucial relaxation messages for result interpretation. The impetus of this work is to help engineers and researchers with petroleum background obtain new insights into NMR principals and extend existing methodologies for characterization of unconventional formations. This article first gives a brief description of the development history of relaxation theories and models for porous media. Then, the widely used NMR techniques for characterizing petrophysical properties and pore structures are presented. Meanwhile, limitations and deficiencies of them are summarized. Finally, future work on improving these insufficiencies and approaches of enhancement applicability for NMR technologies are discussed.

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Section: Issue Type Ideas and Approachesmentioning

confidence: 99%

Advances in low-field nuclear magnetic resonance (NMR) technologies applied for characterization of pore space inside rocks: a critical review

et al. 2020

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“…At present, the study of rock mechanics in cold regions has gradually become one of the hot topics, and the application of new technologies and means promotes its development, such as Nuclear Magnetic Resonance (NMR) technology (Ding et al 2020;Zhou et al 2015;Liu et al 2021;Jia et al 2020;Liu et al 2020a;Pan et al 2020;Zhang et al 2020d;Liu et al 2020b;), Ultrasonic Detections (Ding et al 2020;Wang et al 2017;Çelik, 2020;Wang et al 2019;Ivankina et al 2020), Digital Image Correlation (DIC) (Mardoukhi et al 2021), Neutron Diffraction Measurements (Ivankina et al 2020), Scanning Electron Microscope (SEM) (Wang et al 2017;Çelik, 2020;Wang et al 2019;Chang et al 2020;Abdolghanizadeh et al 2020;Fang et al 2018;Zhou et al 2018;Yang et al 2021b;Zhou et al 2019;Zhao et al 2019), Computed Tomography (CT) technique (Wang et al 2020b), Optical Microscope (Çelik, 2020;Mousavi et al 2020), X-ray Computed Micro-tomography (Deprez et al 2020b), X-ray diffraction (XRD) (Zhao et al 2019;Mousavi et al 2020), Acoustic Emission (Wang et al 2020b;Xiao et al 2020), Infrared thermography (Yang et al 2021a). These new techniques and their combined applications help to discover new features in experiments and provide verification means for the development of theory or numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on characteristics of impact compression of freeze–thawed granite samples under four different states considering moisture content and temperature difference

Zhang

Liu

et al. 2021

Environ Earth Sci

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The mechanics of rock masses in cold regions have attracted the attention of researchers from all over the world, and the concern here is that the mechanical properties of rock masses are inevitably weakened under freeze-thaw cycles. In this paper, firstly, granite samples were subjected to different freeze-thaw cycles, after that, we dealt with the freeze-thawed samples considering four different states, such as saturated and frozen states, saturated and normal temperature states, dry and frozen states as well as dry and normal temperature states. The impact compression test was carried out by using the Split Hopkinson Pressure Bar (SHPB) device. Results show that the impact strength of granite samples deteriorates with the increase of freeze-thaw cycles in the same state, for samples in different states, although the number of freeze-thaw cycles is equal, the degree of deterioration of the impact strength is different. For freeze-thawed granite samples in the same state, the dynamic elastic modulus decreases with the increase of freeze-thaw cycles, and its degree of decrease is different for different states. Under the same freeze-thaw cycles, the deterioration of mechanical properties of granite samples is different in four different weather states, for example, the dynamic elastic modulus from large to small is generally as follows: saturated and frozen states, saturated and normal temperature states, dry and frozen states as well as dry and normal temperature states. Finally, the freeze-thaw influence factor is proposed to describe the damage of granite samples. All in all, it can be concluded that water and low temperature strengthen the influence of freeze-thaw cycles on the dynamic mechanical properties of granite samples.

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“…Geng-she et al [2] proposed the development direction of multiscale damage identification and evaluation mechanism of freeze-thaw rock mass and preliminarily discussed the microfine-macrocross-scale cognitive thinking of freeze-thaw induced rock mass damage. Liu et al [3] investigated the damage evolution law of rock mass with different macroscopic and microscopic defects under freezethaw cycles using nuclear magnetic resonance technology. Wen et al [4] studied the change rules of physical and mechanical properties of rocks after freeze-thaw cycles at varying temperatures and preliminarily discussed the engineering application of the freeze-thaw rock test results.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Mechanical Properties of Freeze‐Thaw Damaged Red Sandstone under Combined Dynamic and Static Loading

Mei

Liang

Wen

et al. 2021

Shock and Vibration

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Using the freeze-thaw cycle test chamber, the red sandstone samples are subjected to cyclic freeze-thaw tests. The physical properties, static mechanical properties of freeze-thaw damage rocks, and the compressional wave velocity at specific axial pressure are measured using conventional physical tests and uniaxial compression tests. The mechanical properties of freeze-thaw damage rocks under dynamic and static loading were studied using Hopkinson pressure bar which can exert axial pressure. The studies show that, with the increase of freeze-thaw cycles, the surface layer of the rock sample undergoes spalling phenomenon, the weight gradually decreases, the sample compactness becomes worse, there are microcracks between the cemented particles, and the compressive strength and elastic modulus decrease. Under the static loading, the longitudinal wave velocity of freeze-thaw damaged samples change significantly compared with that of samples without freeze-thaw. The freeze-thaw damage degree, axial pressure, and strain rate are coupled with each other, which together affect the dynamic mechanical properties of samples, and make the variation of mechanical parameters, such as dynamic peak strength and dynamic elastic modulus of rock. The combined action of freeze-thaw damage and axial pressure weakens the strain rate effect of samples, but when the incident wave of SHPB test is same, the dynamic strength and elastic modulus of freeze-thaw damaged samples are reduced compared with those without freeze-thaw. Combining with strain equivalence principle, the constitutive relation of freeze-thaw damage of red sandstone under dynamic and static combined loading can reflect the influence of coupling damage of axial pressure and freeze-thaw, dynamic impact parameters, and other factors, which are in good agreement with the test results.

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Freeze-thaw damage evolution of fractured rock mass using nuclear magnetic resonance technology

Cited by 62 publications

References 28 publications

Advances in low-field nuclear magnetic resonance (NMR) technologies applied for characterization of pore space inside rocks: a critical review

Advances in low-field nuclear magnetic resonance (NMR) technologies applied for characterization of pore space inside rocks: a critical review

An experimental study on characteristics of impact compression of freeze–thawed granite samples under four different states considering moisture content and temperature difference

Experimental Study on Mechanical Properties of Freeze‐Thaw Damaged Red Sandstone under Combined Dynamic and Static Loading

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