Disintegration characteristics of moderately weathered mudstone in drawdown area of Three Gorges Reservoir, China

Zhen-hua, Zhang; Liu, Wu; Cui, Qiang; Han, Lei; Yao, Huayan

doi:10.1007/s12517-018-3751-8

Cited by 23 publications

(6 citation statements)

References 21 publications

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“…A disintegration test is used to test the water resistance of the soil and to evaluate the disintegration characteristics [27][28][29]. Many researchers have conducted water stability experiments on untreated soil and its impact factors, including initial water content [30], temperature [31], sample shape [32], particle size [33], salinity [34], mineral composition [33,35] and micro-structure [36,37], etc., but compactness is rarely considered an important quality control index for subgrade. With respect to the stabilized soils, investigations into water stability have primarily emphasized two aspects: analyzing the concentration changes of cations (e.g., calcium ions, sodium ions, etc.)…”

Section: Introductionmentioning

confidence: 99%

Assessment of Engineering Behavior and Water Resistance of Stabilized Waste Soils Used as Subgrade Filling Materials

He,

Liu,

Yan

2024

Applied Sciences

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Urban construction has generated substantial amounts of waste soils, impeding urban ecological development. With the aim of promoting waste recycling, waste soils possess a high potential for sustainable utilization in subgrade construction. However, these waste materials exhibit inadequate engineering properties and necessitate stabilization for an investigation into their long-term performance as subgrade filling materials. Initially, a thorough assessment and comparison were conducted to examine the key mechanical properties of lime- and cement-stabilized soils with mixed ratios (total stabilizer contents ranging from 2% to 8%). The results indicated that these soils met the requirements of subgrade materials except for the 2% lime-treated soil. Subsequently, to reveal the improvement in water resistance of stabilized waste soil (e.g., under conditions of rainfall or elevated groundwater table), the effects of soil densities and stabilizer contents on the disintegration characteristics were investigated using a range of disintegration tests. An evolutionary model for the disintegration ratio of stabilized soils was then developed to predict the process of disintegration breakage. This model facilitates the quantification of the lower disintegration rates and elevated disintegration time attributed to higher levels of compactness and stabilizer contents during a three-stage disintegration process. This enhances the understanding and evaluation of sustainable applications in stabilized waste soils used as subgrade filling materials.

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Section: Introductionmentioning

confidence: 99%

Assessment of Engineering Behavior and Water Resistance of Stabilized Waste Soils Used as Subgrade Filling Materials

He,

Liu,

Yan

2024

Applied Sciences

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“…As for the red-bed soft rock in the drawdown area on bank slopes of landslide, the cyclic drying-wetting process lasts for a long time during the course of reservoir operation and has its own distinct drying-wetting alternating regime (Zhang et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Disintegration Mechanism and Hydrogeochemical Processes of Red-Bed Soft Rock Under Drying-Wetting Cycle

Huang¹,

Kang²,

Zha³

et al. 2021

Preprint

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Red-bed soft rock in the drawdown area on bank slopes of landslide easily disintegrates upon exposure to water, and its properties experience comprehensive deterioration, which will cause bank slope instability. To better study disintegration mechanism of the red-bed soft rock, a series of laboratory tests were conducted in this paper to investigate the disintegration characteristics, durability and hydrogeochemical process of red-bed argillaceous siltstone under drying-wetting cyclic conditions. Experimental results showed that, with increasing number of drying-wetting cycles, red-bed argillaceous siltstone gradually disintegrated, from initial appearing the cracks on the surface of the samples to large particles gradually breaking up into small fragments. Significant changes in grain size distribution, and the durability index of the samples progressively decreased. Microstructural analysis showed that the size and distribution of pores and cracks in the sample surface significantly increased, such that the sample surface became disordered and complicated. Notable changed in concentrations of ions in the soaking solutions indicated continuous mineral dissolution and loss during the cyclic drying-wetting. Based on the results obtained from the experiment, it is concluded that the disintegration of samples undergoing drying-wetting cycles was the result of the synergistic action of water and temperature. To be specific, the dissolution of calcite, albite, gypsum, montmorillonite and kaolinite during the wetting procedure, which promotes the decrease in mineral content and increases in pores and cracks. The increases in temperature and the dehydration shrinkage of sample during the drying procedure accelerated the disintegration of the samples.

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“…Yan's research (Yan et al, 2018) pointed out that temperature can accelerate the interaction of water and red-bed soft rock and increase the rate of soft rock disintegration. Zhang et al (Zhang et al, 2018) performs 11 wet and dry cycles on mudstone. He found that the dry-wet cycle in the early stage had a greater impact on the disintegration of mudstone.…”

Section: Introductionmentioning

confidence: 99%

Effects of Dissociation Water Retention on Pore Structure Disintegration in Hydrate Sediments

Liu

Wang

et al. 2020

Front. Energy Res.

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During the depressurization process, natural gas hydrates (NGHs) decompose and release methane gas and water. Field experience shows that only 1% of the dissociation water is recovered, hindering the continuous pressure decline and further NGHs decomposition. The retention effect of the dissociation water on the pore structure is still unclear in NGHs sediments. In this paper, the hydrate sediment samples were tested for porosity, permeability, pore structure and clay minerals content, etc. The ions concentration change of solution was continuously measured using a conductivity meter to evaluate the disintegration mechanism of sediments. The results show that the pore structure of sediments tend to disintegrate under the action of dissociation water, leading to an increase in the ions concentration of dissociation water. According to the ions concentration curve, the sediment disintegration is divided into two stages. The rapid disintegration stage is mainly related to clay minerals. The slow disintegration stage is mainly related to the dissolution of soluble salt minerals. The initial water content is the main factor affecting the disintegration of the sediment skeleton. Under the condition of low initial water content, the sediment skeleton disintegrates instantaneously in dissociation water. When the initial water content exceeds 30.6–37.9%, the pore structure of sediments tends to be stable in dissociation water. Studying the effect of dissociation water on the sediment pore structure is helpful to understand the mechanism of low water production and to optimize the exploitation regime of gas hydrate.

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Disintegration characteristics of moderately weathered mudstone in drawdown area of Three Gorges Reservoir, China

Cited by 23 publications

References 21 publications

Assessment of Engineering Behavior and Water Resistance of Stabilized Waste Soils Used as Subgrade Filling Materials

Assessment of Engineering Behavior and Water Resistance of Stabilized Waste Soils Used as Subgrade Filling Materials

Disintegration Mechanism and Hydrogeochemical Processes of Red-Bed Soft Rock Under Drying-Wetting Cycle

Effects of Dissociation Water Retention on Pore Structure Disintegration in Hydrate Sediments

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