A Multiple Regression Approach to Predict Swelling in Mudrocks

Sarman, Rakesh; Shakoor, Abdul; Palmer, Donald F.

doi:10.2113/gseegeosci.xxxi.1.107

Cited by 17 publications

(16 citation statements)

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“…For soft and clay-bearing rocks, swelling clay minerals can produce loading and unloading of tensile stresses caused by absorption and desorption of water (Gokceoglu et al 2000;Ozbek 2014;Zhou et al 2017). This can promote the growth and expansion of internal micro-cracks, resulting in increased porosity and lower strength of rock (Sarman et al 1994;, Zhou et al 2017).…”

Section: Discussionmentioning

confidence: 99%

Strength properties of fresh and weathered rocks subjected to wetting–drying cycles

Gratchev

Pathiranagei

Kim

2019

Geomech. Geophys. Geo-energ. Geo-resour.

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Unlike previous research on soft and clay-bearing rocks, this study seeks to investigate the effect of wetting and drying (W-D) cycles on the engineering properties of two hard rocks. A series of W-D cycles were applied to fresh specimens of greywacke and basalt, and their strength, slake durability and density were progressively assessed as the number of cycles increased. It was found that unlike the basalt, the strength of greywacke rapidly decreased with increasing W-D cycles while the rock density and slake durability index remained almost the same. Analysis of the crack propagation in both rocks revealed that, compared to soft and clay-bearing material, the process of strength degradation in hard rocks was rather different, with a more pronounced effect of crack development. In addition, comparisons with the data obtained for the same type of rocks yet naturally weathered was performed to establish similarities between the properties of laboratory-deteriorated and naturally weathered rocks. The obtained results are expected to provide more practical values for such laboratory studies where the rate of rock deterioration is relatively high (several weeks) in comparison to what is commonly observed in the field (several years).

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Section: Discussionmentioning

confidence: 99%

Strength properties of fresh and weathered rocks subjected to wetting–drying cycles

Gratchev

Pathiranagei

Kim

2019

Geomech. Geophys. Geo-energ. Geo-resour.

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“…Notably, these investigations on the scour damage of geotechnical bodies failed to account for the effects of prior saturation due to varying durations of rainfall and the attenuation of geotechnical particle cementation resulting Domestic and international scholars have conducted numerous studies on the disintegration characteristics of soft rocks. It is widely accepted that the disintegration of soft rocks arises from a combination of intrinsic factors [4], such as the structural composition of soft rocks, the type of cement, and the content of clay minerals, along with various complex external factors [5][6][7][8], such as rainfall, temperature [8][9][10][11][12], and external stress states. To investigate the disintegration mechanism of soft rocks subjected to dry and wet cycling, researchers such as Wu et al [9], Dhakal et al [10], and Chai et al [11], among others, have conducted indoor experiments.…”

Section: Introductionmentioning

confidence: 99%

“…These regions experience high temperatures and frequent rainfall, resulting in a humid climate. The highly weathered granite in these areas contains a high internal clay mineral content, increasing susceptibility to softening upon contact with water [4][5][6][7]. This vulnerability leads to frequent erosion, mudslides, landslides, and other geological hazards on slopes composed of highly weathered granite [23,24].…”

Section: Introductionmentioning

confidence: 99%

Disintegration Characteristics of Highly Weathered Granite under the Influence of Scouring

He,

Liu,

Zhang

et al. 2024

Water

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In South China, due to climatic factors, highly weathered granite is distributed across a large area and easily disintegrates after encountering water, causing many geological disasters and other problems. To determine the disintegration mechanism of highly weathered granite in South China, disintegration tests were carried out on highly weathered granite in the Fuzhou area under different immersion durations, cycle times, and flow rates, with the help of a self-designed disintegration test device. Moreover, the disintegration mechanism of the highly weathered granite was revealed using nuclear magnetic resonance (NMR) technology. The results demonstrated an increase in the cumulative relative disintegration with prolonged immersion time and the number of dry-wet cycles. Beyond a certain flow rate, the cumulative relative disintegration amount stabilized. There was a strong correlation between the steady disintegration rate and immersion time (or dry-wet cycles). The disintegration process of the highly weathered granite was divided into three stages: rapid, moderate, and stable disintegration. Notably, disintegration primarily occurred around the large pores. This study revealed that the variation in the immersion time (or wet-dry-scouring cycles) was fundamentally linked to changes in the relative volume of the large pores in the rock samples. These findings provide valuable insights for predicting and mitigating surface disasters on highly weathered granite slopes.

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“…These factors interact in a complex manner. Additionally, the internal mineral composition of the rock and the macro-performance of microstructural changes play crucial roles in this process [12][13][14][15][16][17][18][19][20][21][22][23]. The effects of variations in the water chemistry on the deterioration and disintegration properties of rocks have attracted the attention of several researchers [24].…”

Section: Introductionmentioning

confidence: 99%

Effects of pH on Disintegration Characteristics of Gypsum Karst Breccia under Scouring Action

He,

Liu,

Zhang

et al. 2023

Minerals

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Water–rock interactions and scouring actions are recognized key factors that significantly influence the disintegration of rock on the surface of slopes. However, the research on rock disintegration, specifically under the action of scouring, is limited, which makes it difficult to understand the characteristics of rock disintegration. Therefore, in this study disintegration tests were performed on the gypsum karst breccia collected from the Zhoukoudian site in Beijing, using a self-made disintegration test device. Further, this study investigated the impact of solution pH, flow velocity, and the number of cycles on the characteristics of rock disintegration. The changes in pore structure, microstructure, and mineral composition of the rock were analyzed using nuclear magnetic resonance (NMR), scanning electron microscopy (SEM), X-ray diffraction (XRD), and inductively coupled plasma optical emission spectrometer (ICP-OES) methods. The findings reveal that the cumulative relative disintegration amount of the gypsum karst breccia experiences an increase as the pH value of the soaking solution decreases and the number of cycles increases. Once a specific flow rate is attained, the cumulative relative disintegration amount stabilizes (about 73%) and no longer exhibits significant changes. This phenomenon signifies the presence of a stabilizing flow rate for disintegration. The stable flow rate concerning rock disintegration is influenced by both the solution’s pH and the number of cycles. Following acid contamination, the rock sample’s particle morphology undergoes disruption, leading to the dissolution of cement. This, in turn, leads to an augmented release of Ca2+, Al3+, and Ma2+ ions in the solution, intensifying the disintegration of the rock samples. Conversely, alkali contamination prompts secondary cementation, mitigating localized damage. This results in a marginal increase in the calcite content within the rock samples (from 15.3% to 19.2%), while the release of Ca2+ in the solution experiences a decrease. Additionally, there is a slight increase in the release of Al3+ (a maximum increase of 1.71 mg/L), which minimally inhibits the disintegration of the rock samples. Notably, the rock disintegration predominantly occurs around macropores, and the effect of solution pH on the disintegration characteristics and stable flow rate is primarily due to the changes in the relative proportion of macropore volume in the rock samples. The findings of this study have significant implications for the prediction and control of slope-related issues.

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A Multiple Regression Approach to Predict Swelling in Mudrocks

Cited by 17 publications

References 0 publications

Strength properties of fresh and weathered rocks subjected to wetting–drying cycles

Strength properties of fresh and weathered rocks subjected to wetting–drying cycles

Disintegration Characteristics of Highly Weathered Granite under the Influence of Scouring

Effects of pH on Disintegration Characteristics of Gypsum Karst Breccia under Scouring Action

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