Water Saturation Effects on Thermal Infrared Radiation Features of Rock Materials During Deformation and Fracturing

Cai, Xun; Zhou, Zilong; Tan, Lihai; Zang, Haizhi; Song, Zhengyang

doi:10.1007/s00603-020-02185-1

Cited by 84 publications

(32 citation statements)

References 77 publications

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“…e elastic modulus and compressive strength of water-saturated rock samples both decline, showing the reduction amplitudes of 27.3% and 35.2% compared with those in the dry state. It can be seen that moisture content can remarkably affect the mechanical properties of rock samples and the final rock fracture and failure [20,24].…”

Section: Analysis Of the Compressive Strengthmentioning

confidence: 99%

Experimental Investigation of Mechanical Behavior of Sandstone with Different Moisture Contents Using the Acoustic Emission Technique

Liu

2020

Advances in Civil Engineering

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The moisture content is a critical factor tightly related to rock deformation and its failure process since it leads to a significant change in the physicomechanical properties of rock during the underground engineering construction. As a result, engineering construction accidents take place frequently. To figure out the influence of the moisture content on the physicomechanical properties of water-bearing rock and then effectively avoid engineering accidents, multiple tests including the uniaxial compression test, Brazilian splitting test, and the acoustic emission (AE) test were carried out in this study. The experimental results showed that the water absorption rate of the sandstone gradually stabilizes after 5 h, and its uniaxial compressive strength, tensile strength, and elastic modulus all decline with the increase of the moisture content. Compared to the dry state of the sample, the reduction amplitudes of the elastic modulus, compressive strength, and tensile strength of water-saturated rock samples can reach up to 27.3%, 35.2%, and 38.1%, respectively. It indicates that the tensile strength is more sensitive to the softening effect of the moisture. Through the AE test, it can be found that the internal state of water-saturated rock samples is greatly changed; the compressive strength of rock samples drops, so the rock can be damaged after absorbing less energy. Thus, moisture shows a certain softening effect on rock. The research results are expected to provide a basis for underground engineering construction and rock fracture and failure.

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Section: Analysis Of the Compressive Strengthmentioning

confidence: 99%

Experimental Investigation of Mechanical Behavior of Sandstone with Different Moisture Contents Using the Acoustic Emission Technique

Liu

2020

Advances in Civil Engineering

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“…Weakening Mechanism for Strength Reduction Induced by WD Cycles. It is extensively shared that the presence of water plays a dominant weakening role on rock strength and stiffness due to physical-chemical-mechanical waterrock interactions [19,[30][31][32][33][34]. Some water-weakening effects will be vanished when the rock is dried again, but some are not and lead to irreversible damage of rock structure [35].…”

Section: Discussionmentioning

confidence: 99%

Degradation of Strength and Stiffness of Sandstones Caused by Wetting-Drying Cycles: The Role of Mineral Composition

2021

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Rock mechanical parameters are of great importance for the construction and design of rock engineering. Rocks are usually subjected to the deteriorating effect of cyclic wetting-drying because of the change in moisture content. The main objective of this study is to reveal the degradation effects of wetting-drying cycles on strength and modulus on varying rocks. Three kinds of sandstones with different mineral constituents are selected for testing. Artificial treatments of cyclic wetting-drying are conducted on respective specimens of the three sandstones (0, 10, 20, 30, and 40 cycles) to simulate the damage of rocks exposed to natural weathering. Uniaxial compressive tests are carried out on sandstone specimens to obtain their strength and modulus. Test results show that, for the tested sandstones, both of the uniaxial compressive strength (UCS) and modulus are reduced as the cyclic number rises. In the first ten cycles, the losses of UCS and modulus are very significant. Subsequently the changes of UCS and modulus become much more placid against cyclic number. When the cyclic number is the same, the loss percentages of rock mechanical properties of the three sandstones are very different which mainly depends on the contents of expandable and soluble minerals.

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“…The above mentioned research studies concentrated on the estimation of macroelastic modulus. Fracture toughness, reflecting the resistance for crack initiation and propagation [27,28], is another crucial parameter for rock fragmentation and hydrofracturing [29][30][31][32]. At the microscopic level, the fracture toughness of indents can be determined by the crack length method [33] or energy method [26,[34][35][36] based on nanoindentation results.…”

Section: Introductionmentioning

confidence: 99%

Estimating Macrofracture Toughness of Sandstone Based on Nanoindentation

et al. 2021

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An upscaling method for estimating macrofracture toughness by nanoindentation results was proposed in this study. Grid nanoindentation tests were conducted on sandstone samples to obtain micromechanical properties of indents, including elastic modulus, hardness, and stiffness. Multifactor cluster analysis was then carried out to categorize the sandstone into five mechanical phases. Finally, the macrofracture toughness was predicted by using the macroelastic modulus of the sample and the critical energy release rate of the weakest phase. To verify this method, the upscaling result was compared with the macrofracture toughness measured by the notched semicircular bending (NSCB) test. The discrepancy in the macrofracture toughness from our method and the NSCB test was 8.8%, which was acceptable. Also, it is proved that our method can provide more accurate upscaling results compared to other methods.

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Water Saturation Effects on Thermal Infrared Radiation Features of Rock Materials During Deformation and Fracturing

Cited by 84 publications

References 77 publications

Experimental Investigation of Mechanical Behavior of Sandstone with Different Moisture Contents Using the Acoustic Emission Technique

Experimental Investigation of Mechanical Behavior of Sandstone with Different Moisture Contents Using the Acoustic Emission Technique

Degradation of Strength and Stiffness of Sandstones Caused by Wetting-Drying Cycles: The Role of Mineral Composition

Estimating Macrofracture Toughness of Sandstone Based on Nanoindentation

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