Study on the Evolution Law of Sandstone Porosity under Soaking-Drying Cycles

Luo, Zuosen; Zhu, Zuoxiang; Qiao, Juan; Xu, Xiaoliang; Liu, Daxiang; Zhou, Meiling

doi:10.1007/s12205-021-1744-8

Cited by 4 publications

(3 citation statements)

References 19 publications

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“…The physical weathering of rocks, marking the inception of soil genesis, is dictated by several in uencers, with pH, temperature, humidity, salinity, and physical stress being paramount. Temperature and moisture emerge as the primary arbiters of the weathering rate (Luo et al, 2022). In frigid climes, characterized by signi cant daynight temperature variations, rocks are subjected to the simultaneous impacts of humidity and freeze-thaw cycles.…”

Section: Introductionmentioning

confidence: 99%

Impact of Freeze-Thaw Cycles on the Weathering and Disintegration Rates of Coal Gangue

Gong,

Yang

2024

Preprint

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Coal extraction in China is increasingly moving towards colder regions such as Xinjiang and Inner Mongolia. However, these mines face land restoration challenges due to a scarcity of fertile topsoil. This study explores the potential of coal gangue, a mining byproduct, as a viable substitute for topsoil. The study examines the effects of humidity fluctuations and freeze-thaw cycles, both individually and in combination, on the weathering disintegration of coal gangue. Fourteen interventions were analysed, and the findings indicate that the combined application of humidity and freeze-thaw cycles significantly accelerates the disintegration process, outperforming the individual interventions. In addition, it was found that significant temperature variations cause moisture and salts within the gangue to expand, which affects the rate of disintegration. The study showed that the rate of weathering disintegration was significantly higher in conditions of saturated humidity-freeze-thaw cycles compared to unsaturated humidity conditions. This highlights the essential role of ice crystals in accelerating the weathering process during temperature fluctuations. The study highlights the importance of humidity over temperature in the weathering and disintegration of coal gangue. It also suggests that freeze-thaw cycles can enhance this process.

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Section: Introductionmentioning

confidence: 99%

Impact of Freeze-Thaw Cycles on the Weathering and Disintegration Rates of Coal Gangue

Gong,

Yang

2024

Preprint

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“…The wetting-drying cycle refers to the process in which the rock mass is continuously subjected to repeated cycles of soaking, dewatering, soaking, and dewatering under rainfall or groundwater conditions [12][13][14][15][16][17][18][19]. In this process, the physical and mechanical parameters of the rock mass are continuously weakened, the strength is continuously reduced, and the creep aging effect is continuously intensified [20][21][22][23][24][25][26], with the increase of time, under certain conditions, it may even cause accidents such as engineering instability and failure.…”

Section: Introductionmentioning

confidence: 99%

“…Goh et al [50] studied the shear strength characteristics of unsaturated soil under multiple dry-wet cycles. Liu et al [51] pointed out that the microstructure adjustment of rock under dry-wet cycle is the main reason for the deterioration of rock physical and mechanical properties. Barefield et al [52] studied the strength loss of sandstone under different water contents by uniaxial compression test.…”

Section: Introductionmentioning

confidence: 99%

Study on creep mechanical properties of carbonaceous shale under dry-wet cycle

Wei¹,

et al. 2023

Phys. Scr.

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The creep mechanical properties of rock under dry-wet cycles are of great significance for studying the long-term aging stability of engineering rock and soil. In the past, there were few studies in this area, and most of the dry-wet cycle tests on rock samples did not conform to the actual stress state of the rock. In view of the shortcomings of these studies, this paper innovatively carried out the dry-wet cycle test of the rock under the continuous state of the stress field, and studied its mechanical properties. The specific method is to take carbonaceous shale as the research object, and use the soft rock shear rheological test system independently developed by our research group to carry out the shear creep test of carbonaceous shale under the action of dry-wet cycle. The test results show that the creep full-time curves of carbonaceous shale under different dry-wet cycles show a step-shaped curve shape. The dry-wet cycle has a significant effect on the deformation characteristics of carbonaceous shale. With the increase of the number of dry-wet cycles, the instantaneous strain of the rock gradually increases, the instantaneous shear modulus decreases from 596.650 MPa at 0 times to 365.199 MPa at 12 times, and the attenuation rate reaches 38.79 %. The creep strain and cumulative creep strain become larger, the stress required for accelerated creep decreases from 3.29 MPa to 2.75 MPa, and the accelerated creep time in the third stage increases from 11.892 h to 5.316 h, and the creep effect is more significant. The long-term strength of carbonaceous shale decreases from 3.05 MPa to 2.49 MPa, and the decrease increases with the increase of dry-wet cycles. The more the number of dry-wet cycles, the smaller the undulation of the shear failure section of the carbonaceous shale, and the smoother the surface. The research results have important guiding significance for the long-term aging stability analysis of engineering rock and soil mass subjected to repeated dry-wet cycles.

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Multiscale evolution mechanism of sandstone under wet-dry cycles of deionized water: From molecular scale to macroscopic scale

Meng

Zhou

et al. 2023

Journal of Rock Mechanics and Geotechnical Engineering

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Study on the Evolution Law of Sandstone Porosity under Soaking-Drying Cycles

Cited by 4 publications

References 19 publications

Impact of Freeze-Thaw Cycles on the Weathering and Disintegration Rates of Coal Gangue

Impact of Freeze-Thaw Cycles on the Weathering and Disintegration Rates of Coal Gangue

Study on creep mechanical properties of carbonaceous shale under dry-wet cycle

Multiscale evolution mechanism of sandstone under wet-dry cycles of deionized water: From molecular scale to macroscopic scale

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