Experiments on three-dimensional flaw dynamic evolution of transparent rock-like material under osmotic pressure

Zhu, Shu; Zheng, Jinhai; Zhu, Zhende; Zhu, Qi‐Zhi; Zhou, Luming

doi:10.1016/j.tust.2022.104624

Cited by 15 publications

(8 citation statements)

References 24 publications

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“…Ashby [ 32 ] and Nemat-Nasser [ 33 ] performed physical model compression tests using similar materials with single and multiple cracks, observing the initiation and propagation shapes of surface-penetrating cracks and rock bridge penetration patterns, revealing the evolution of crack propagation. Zhu et al [ 34 ] conducted biaxial experiments under water pressure using transparent resin-based rock-like materials, revealing the evolution patterns of prefabricated crack expansion.…”

Section: Discussionmentioning

confidence: 99%

Research Progress and Hot Spot Analysis of the Propagation and Evolution Law of Prefabricated Cracks in Defective Rocks

Zhu

Wang

2023

Materials

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The generation of rock mass disasters in underground engineering essentially arises from the disruption of the original three-dimensional stress equilibrium of the rock mass caused by excavation and other activities, leading to the redistribution of stress fields. During the excavation process, the engineering rock mass undergoes complex dynamic stress equilibrium processes involving loading and unloading. This equilibrium process promotes the nucleation, initiation, and propagation of pre-existing cracks in the surrounding rock, resulting in changes in the internal structure of the rock mass and a weakening of its strength. Eventually, this localized cracking extends to global failure. In order to understand the current status better and study the development trends in the study of crack propagation and evolution in defective rock, this study conducts a bibliometric analysis of 288 articles from the Web of Science Core Collection database using CiteSpace software (version 6.1.R4). The results indicate an increasing trend in the annual publication output, characterized by two phases of emergence and rapid development. The countries of China, the United States, and Iran have the highest publication output in this field. The most frequently cited journals include INT J ROCK MECH MIN, ENG FRACT MECH, and ROCK MECH ROCK ENG. This study provides a comprehensive analysis of the current status and development trends in the research on the propagation and evolution of pre-existing cracks. This study enhances the comprehension of crucial aspects of crack propagation and evolution in rock materials with defects. Moreover, it opens up new possibilities for future investigations and holds promising implications for researchers and practitioners in the field.

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Section: Discussionmentioning

confidence: 99%

Research Progress and Hot Spot Analysis of the Propagation and Evolution Law of Prefabricated Cracks in Defective Rocks

Zhu

Wang

2023

Materials

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“…Clay minerals with loose structure and low strength will be pulled apart before quartz during loading, then the sandstone tensile strength will be primarily borne by quartz particles. The complete quartz particles were strong and cannot be easily broken directly, hence, the final tensile surface may present the following two forms [26]: (1) When passing through the unbroken quartz particles, cracks will expand along the weak part of the quartz boundary; and (2) when passing through the broken quartz grains, the cracks will pass directly through the quartz interior. When the quartz in the sandstone was relatively complete, the tensile strength of the sandstone will be significantly greater than that of the sandstone with relatively broken quartz particles.…”

Section: Evolution Process Of Sandstone Strength Deteriorationmentioning

confidence: 99%

Deterioration Effect of Sandstone Tensile Strength and Its Mesoscopic Mechanism under Dry-wet Cycles

Yang

Zhang

Deng

et al. 2023

Period. Polytech. Civil Eng.

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The rock mass in the hydro-fluctuating zone of the reservoir bank slope is under dry-wet cycles for a long time, which will cause the deterioration of rock mass and induce geological disasters. In this study, a series of dry-wet cycle tests on the argillaceous quartz sandstone in the Three Gorges Reservoir area was carried out. Then, after different dry-wet cycles, the sandstone specimens were used to conduct the Brazilian splitting, scanning electron microscope, and 3D laser scanning tests. Herein, we provided detailed physical and microscopy image data to analyze the deterioration effect of tensile strength and mesostructure deterioration process of sandstone. With the increase of dry-wet cycles, the tensile strength of sandstone initially decreases rapidly, and then the decline rate tends to slow down. The evolution laws of fractal dimension and porosity are also significantly consistent with the deterioration of tensile strength. Moreover, further mesostructural analysis has revealed the repeated “absorption and swelling-dehydration and contraction” of clay minerals. This results in the breakage of framework mineral quartz and the expansion and connectivity of internal cracks, which ultimately deteriorates sandstone’s tensile strength.

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“…Based on this material, Zhu, Lin and Sun et al revealed the effects of fissure length, inclination, spacing, and rock bridge angle on the crack expansion and coalescence modes of single or multiple three-dimensional fissure and the strength of the specimens under uniaxial compression 16 – 18 . Zhu et al 19 used this material to conduct hydraulic fracturing experiments on single fracture specimens under uniaxial and biaxial compression conditions, and revealed the effects of different osmotic pressures and crack forms on the initiation, coalescence, and peak strength of elliptical opening-type cracks. Fu et al 20 developed a rock-like material formed by the reaction of a new type of unsaturated polyacrylate resin and hardener, which exhibits good brittle fracture characteristics at lower temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, with the emergence of problems like water inrush and instability in rock bodies in water-rich geological environments, and the improvement of experimental conditions, many scholars have embarked on more in-depth explorations of the failure mechanisms of fractured rock bodies under the coupled effects of high water pressure and engineering excavation disturbances. Based on transparent rock-like materials, Zhu et al 19 and Fu et al 25 studied the progressive damage mechanisms and patterns of three-dimensional crack tips under hydromechanical coupling. Regarding the shear-flow coupling characteristics of fractures, some researchers 29 , 30 used transparent acrylic resin and gypsum to create the upper and lower parts of shear samples with the same surface morphology as natural fractures.…”

Section: Introductionmentioning

confidence: 99%

Proportioning optimization of transparent rock-like specimens with different fracture structures

Cui,

Hao,

et al. 2024

Sci Rep

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Clarifying the principles of proportioning optimization for brittle transparent rock-like specimens with differential fracture structures is crucial for the visualization study of the internal fracture and seepage evolution mechanisms in rock masses. This study, utilizing orthogonal experimental methods, uncovers the influence mechanisms, extents, and patterns by which the ratios of resin, hardener, and accelerator, along with the freezing duration, impact the mechanical characteristics of transparent rock-like specimens. Notably, it was observed that as the accelerator ratio and freezing time are increased, there’s a general decline in the uniaxial compressive strength, tensile strength, and elastic modulus of the specimens. In contrast, an increase in the hardener ratio initially leads to an enhancement in these mechanical properties, followed by a subsequent decrease. Under uniaxial compressive loading, the specimens exhibit four typical modes of failure: bursting failure, splitting failure, single inclined plane failure, and bulging failure. As the hardener and accelerator ratios increase, the mode of failure gradually shifts from bulging to bursting, with freezing time having a minor overall impact on the evolution of failure modes. The study proposes a method for inducing random three-dimensional closed fractures within the specimens and further clarifies the principles for optimizing the proportions of specimens with different fracture structures, such as intact, embedded regular, and random three-dimensional fractures. This research facilitates the in-depth application of transparent rock-like materials in various scenarios and provides theoretical guidance and technical support for visualizing the evolution of fracture and seepage characteristics within the fractured rock mass.

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Experiments on three-dimensional flaw dynamic evolution of transparent rock-like material under osmotic pressure

Cited by 15 publications

References 24 publications

Research Progress and Hot Spot Analysis of the Propagation and Evolution Law of Prefabricated Cracks in Defective Rocks

Research Progress and Hot Spot Analysis of the Propagation and Evolution Law of Prefabricated Cracks in Defective Rocks

Deterioration Effect of Sandstone Tensile Strength and Its Mesoscopic Mechanism under Dry-wet Cycles

Proportioning optimization of transparent rock-like specimens with different fracture structures

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