The degradation effect and mechanism by water-rock interaction in the layered sandstone in the Three Gorges reservoir area

Qiao, Juan; Deng, Huafeng; Li, Jianlin; Luo, Zuosen; Assefa, Eleyas; Fang, Jingcheng; Xiao, Yao

doi:10.1007/s12517-019-4943-6

Cited by 14 publications

(5 citation statements)

References 7 publications

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“…Microscopic Degradation Mechanisms. Numerous studies have shown that dry-wet cycling alters rocks' microstructural morphology and mineral fractions [34][35][36]. To further investigate the degradation characteristics of red sandstone from a microscopic perspective and reveal its microscopic degradation mechanism, the changes in the internal microstructure and mineral composition of the samples after undergoing dry-wet cycling were analyzed with the aid of SEM and XRD testing.…”

Section: Strength Deterioration Decay Predictionmentioning

confidence: 99%

Effect of Dry–Wet Cycling on the Degradation Characteristics and Mechanisms of Red Sandstone

et al. 2023

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The physical and mechanical parameters and degradation mechanisms of red sandstone in the Mount Wuyi scenic area were studied under the action of dry–wet cycles. Dry–wet cycle, acoustic wave velocity, water saturation rate, and triaxial compression tests were conducted, aided by scanning electron microscopy and X-ray diffraction testing techniques. The study’s results show that the dry–wet cycle effect on red sandstone is a major factor in the degradation of its physical and mechanical parameters and that its microstructural characteristics are significantly affected. The P-wave velocity, peak strength, elastic modulus, internal friction angle, and cohesion decreased, the water content and peak strain increased, and the elastic modulus was the most sensitive to dry–wet cycles. A dry–wet cycle’s action severely damages the microstructural integrity of the red sandstone. After 15 dry–wet cycles, the interstitial fillings between the skeletal grains are dissolved over a large area, microfractures are interwoven throughout, and the structure is severely fragmented. The microstructural degradation of the red sandstone by dry–wet cycles mainly manifests in the dissolution of the interstitial filler, and the relative content of calcite as an interstitial filler is reduced by 46.6% after 15 dry–wet cycles. The proposed strength decay prediction equation has reference significance for the strength prediction of the red sand conglomerate in the project. This study’s results can provide theoretical support for the landscape protection of rock masses and the prevention of engineering geological hazards.

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Section: Strength Deterioration Decay Predictionmentioning

confidence: 99%

Effect of Dry–Wet Cycling on the Degradation Characteristics and Mechanisms of Red Sandstone

et al. 2023

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“…In addition, more than 70% of the rainfall occurred from April to August according to the recorded data from 1951 to 2019 in Guilin [1]. Therefore, a rock mass is usually in a state of wetting and drying cycles, and the damage and deterioration of the rock mass caused by this cyclic change is often more serious than that of sustained immersion [11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Influence of Acidic Dry-Wet Cycles on Karst Limestone Deterioration and Damage

Zhang

Wang

et al. 2022

Geofluids

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This study is aimed at the problem of limestone deterioration and damage caused by the combination of acid rain and the dry-wet cycle in Guilin. Samples of limestone were taken to study the influence of acidic dry-wet cycles on limestone deterioration and damage. This was accomplished by performing nuclear magnetic resonance (NMR) measurements and inductively coupled plasma atomic emission spectrometer measurements on the limestone samples. The study found that with an increase in the number of cycles, the T 2 curve of the rock continuously shifts to the right, but the range of movement still decreases with pH increasing values. The T 2 spectrum area, rock porosity, porosity deterioration, mass loss rate, and water absorption rate all increase with an increase in the number of cycles, but the growth rate continues to decrease, and the increase is negatively correlated with pH. After the dry-wet cycles, the mass concentration of each element in the beaker is Ca, Mg, and Fe in order from high to low, and the mass concentration of each main element in the reaction solution increases with the increase in the number of acidic dry-wet cycles.

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“…Focusing on the characteristics of the reservoir slope being subjected to I-ADs, many tests were carried out to simulate the reservoir water level fluctuation. A water-rock interaction test with the layered sandstone as the study object was carried out, and the deformation and strength characteristics of the layered sandstone showed a significant deterioration trend (Jiang et al, 2019). In addition, the damping coefficient and dynamic elastic modulus of sandstone have a logarithmic change in the first six cycles (Deng et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Multiscale Study on Deterioration Characteristics of Soil-Rock Mixtures Under the Immersion-Air dry Circulation

Zhang

Qiang

et al. 2022

Front. Earth Sci.

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Soil-rock mixtures (S-RMs) composed of rock slope colluvium and landslide deposits are common in superficial hazards of bank slopes. The physical and mechanical properties of S-RMs are closely related to environmental conditions, especially reservoir water level fluctuation. Therefore, immersion-air dry (I-AD) circulations tests were carried out to simulate the phenomenon in this study. The macroscopic, mesoscopic, and microcosmic studies of S-RMs are carried out after experiencing cycles (N) of 0, 1, 5, and 10, respectively. Conventional triaxial tests, particle analysis tests, and scanning electron microscopy were performed to study the physical and mechanical properties of S-RMs. According to test results, the maximum deviator stress of S-RMs samples with confining pressures of 100, 200, 300, and 400 kPa after ten cycles is reduced by 41.13, 37.11, 32.17, and 30.20%. With the increase in N there is a significant trend towards reducing the strength of S-RMs, and the strength deterioration after the first I-AD circulation reached 15.73%. After I-AD circulations, the content of fine particles in S-RMs decreases, the grain-size characteristic and non-uniformity coefficient increase significantly, and the gradation of S-RMs shows discontinuity. Moreover, the repeated changes of water pressure have an irreversible impact on the microstructure of S-RMs, which will cause an increase in pore size and a higher pore disorder. In addition, it is found from the established strength parameter evolution equation that when N approaches infinity, S-RMs decomposes the weathering into cohesionless silt with an angle of repose of 0.90322φ0. The study results in this paper clarify the deterioration characteristics of wading S-RMs, and might be used in the bank slopes stability analysis.

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The degradation effect and mechanism by water-rock interaction in the layered sandstone in the Three Gorges reservoir area

Cited by 14 publications

References 7 publications

Effect of Dry–Wet Cycling on the Degradation Characteristics and Mechanisms of Red Sandstone

Effect of Dry–Wet Cycling on the Degradation Characteristics and Mechanisms of Red Sandstone

Experimental Investigation on Influence of Acidic Dry-Wet Cycles on Karst Limestone Deterioration and Damage

Multiscale Study on Deterioration Characteristics of Soil-Rock Mixtures Under the Immersion-Air dry Circulation

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