The weakening mechanisms of the rock mechanics of marlite bank slopes under water–rock interaction conditions

Liu, Haiyan; Li, Zeng-Yao; Zhang, Yushuai; Wang, Dongdong

doi:10.1007/s13146-020-00595-4

Cited by 10 publications

(4 citation statements)

References 19 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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“…The natural fractured rock mass often suffers from the Thermal-Hydraulic-Mechanical-Chemical (THMC) coupling effect in rock and soil engineering works such as rock slopes, nuclear waste disposal in high ground stress mountains, underground energy storage and reservoir dams (Zhang et al2019;Liu et al 2020;Meng et al 2021). Therefore, the THMC multi-field coupling problem has become one of key issues in the rock mechanics and engineering.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the effect of thermal-chemical coupling on tension-shear fracture characteristics of cracked Karst limestone

Zhang

Guo

Wang³

et al. 2022

Preprint

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In the natural environment, the main control structural plane of dangerous rock in karst area is subjected to complex coupling effects of temperature, acid rain and tension-shear force. However, the multi-field coupling effect on the stability of dangerous rocks is still unclear. To further probe this issue, first, the chemical solution immersion tests were carried out at pH of 2, 3, 4, 5 and temperature of 20, 30, 40, 60℃ for pre-cracked limestone, and room temperature rock samples at pH of 7 were used as comparison samples. Second, the tension-shear test on the soaked rock samples were conducted using the self-developed tension-shear test device. The crack propagation and failure modes of tension-shear pre-cracked limestone with different temperatures and pH value solutions were analyzed. Finally, the mineral composition, microstructure and damage degree of different rock samples were tested and analyzed by X-ray diffraction test, SEM test and inductively coupled ion emission spectrometer. The test results show that the temperature and acidity are negatively correlated with the tension-shear strength of limestone. The higher the temperature or acidity, the smaller the ultimate tension-shear peak load. The main mineral composition of limestone is calcite, and the pore size on the rock surface reflects the variation trend of cracking under tension-shear loading. The rock mass loss rate is positively correlated with the temperature and negatively correlated with the pH value, both of which can affect the progress of water rock chemistry and have a certain impact on the degree of rock deterioration.

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“…The cyclic impact of the reservoir water (scouring, dissolution, and erosion) alters the microstructure, physical and mechanical characteristics of the rock mass, and the stability of the bank slope 1 – 3 . In particular, slopes composed of mudstone, limestone, and other soft rocks are significantly affected by the water–rock interaction 4 , 5 .…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies have shown that the water–rock interaction developed and changed the structure of rock 22 – 25 . Liu et al 26 , 27 and Liu et al 5 investigated the microstructure of sandstone and granite rocks under cyclic dry–wet conditions. The findings revealed that the water–rock interaction significantly altered the composition and structural characteristics of the rocks.…”

Section: Introductionmentioning

confidence: 99%

Impact of water–rock interaction on the pore structures of red-bed soft rock

Zhou

Luo

et al. 2021

Sci Rep

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The physical and mechanical properties of the reservoir bank slope are affected by the water–rock interaction. However, few studies considered the impact of long-term water–rock interaction on the evolution law of mesostructure. Therefore, in this study, the water–rock interaction test was conducted on a slightly weathered red-bed soft rock from the Three Gorges Reservoir area, considering the fluctuation in the reservoir water level. The corresponding pore structure parameters were measured and analyzed based on a scanning electron microscope (SEM) and digital image processing technology. The study showed that: (1) The pore size has been gradually increased, while the number of pores was increased initially and then decreased. Within 12 cycles, the maximum and average pore radius of the rock specimens was increased by 101.02% and 43.32%, respectively, and the porosity has been increased by 26.59%, whereas the number of pores decreased by 22.65%. This indicates the effect of water–rock interaction on the propagation of pores. (2) The pores were changed from oblate to slender by the water–rock interaction. The shape factor was decreased by about 15.79% within 12 cycles. In the meantime, the fractal dimension was increased from 1.20 to 1.28, and more complex structures of pores were observed. (3) The porosity evolution model for the red-bed soft rock was established based on the curve fitting technique. The results can be used as a reference to conceptualize the mesostructure damage of rocks under water–rock interaction.

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The weakening mechanisms of the rock mechanics of marlite bank slopes under water–rock interaction conditions

Cited by 10 publications

References 19 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 study on the effect of thermal-chemical coupling on tension-shear fracture characteristics of cracked Karst limestone

Impact of water–rock interaction on the pore structures of red-bed soft rock

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