Mechanical Properties and Deterioration Mechanism of Remolded Carbonaceous Mudstone Exposed to Wetting–Drying Cycles

Yang, Yuling; Zhang, Tao; Liu, Songyu; Luo, Junhui

doi:10.1007/s00603-022-02833-8

Cited by 10 publications

(3 citation statements)

References 38 publications

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“…During the immersion process, it was found that the color of the distilled water mixture gradually turned pale yellow after immersion, which was speculated to be caused by the loss of the water-rock chemical reaction from illite and illite-smectite mixed-layer minerals to distilled water [32]. This phenomenon caused the disintegration of illite and illite-smectite mixed-layer minerals, a loss of connection between clay particles or between clay particles and noncritical cements [37], the expansion of noncritical cements and an increase in noncritical cement pores [29]. Under the action of wetting-drying cycles, the clay particles repeatedly underwent expansion-contraction or even disintegration (the process mechanism is shown in Figure 13), until they detached from the cement.…”

Section: Discussionmentioning

confidence: 99%

“…The dissolution and loss of soluble minerals and increased permeability are the key factors for the deterioration effect of a wetting-drying cycle [36]. However, for soft rock with a high clay mineral content, the expansion/contraction behavior of clay mineral particles is more serious [37,38]. Although CPB and rock have some similar characteristics, because CPB is a prefabricated material, its particle size composition and cementing material composition are very different from rock.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Wetting–Drying Cycles on the Deterioration of the Physical and Mechanical Properties of Cemented Paste Backfill in Open-Pit Coal Mines

Chen,

Shu,

Han

et al. 2024

Minerals

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To promote the sustainable exploitation of open-pit coal resources, waste is used as backfill material to realize the comprehensive utilization of solid waste mine resources. We proposed a mining method that is a combination of the highwall mining and filling mining methods. Cemented paste backfill (CPB) samples were prepared with high-clay-mineral-content marl particles as aggregate and normal Portland cement, sulfoaluminate cement and gypsum as cementing materials. The physical and mechanical properties and microstructural evolution of CPB with different binder ratios under wetting–drying cycles were measured. The results showed that the CPB with 0–3 wetting–drying cycles underwent shear and tensile coalescence, and that with 4–10 cycles underwent shear coalescence. The unconfined compressive strength (UCS) and elastic modulus (EM) decreased exponentially with increasing number of wetting–drying cycles but decreased exponentially and cubically with increasing porosity, respectively. The EM is more sensitive to gypsum content than the UCS. CPB deterioration was divided into an initial deterioration stage and a secondary deterioration stage. The evolution curve of the total damage variable presents an ‘S’ shape, with an initial damage stage, an accelerated damage expansion stage, a decelerated damage expansion stage and an end damage stage. The research results provide a basis for improving the recovery rate of resources under highwall conditions, and the extensive utilization of stripping materials, and promote the coordinated development of coal resource exploitation and environmental protection.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Effect of Wetting–Drying Cycles on the Deterioration of the Physical and Mechanical Properties of Cemented Paste Backfill in Open-Pit Coal Mines

Chen,

Shu,

Han

et al. 2024

Minerals

View full text Add to dashboard Cite

show abstract

“…Carbonaceous mudstone is a kind of mudstone, because it contains a certain amount of organic carbon, so it is called carbonaceous mudstone. Depending on the geology and region, its carbon content can reach 6% to 30% [1]- [2] . Compared with other soft rocks, in addition to its low hardness and poor hydraulic properties, it is also very easy to weather.…”

Section: Introductionmentioning

confidence: 99%

Research on Prediction of Weathering Degree of Carbonaceous Mudstone Based on Entropy Weight-Cloud Model

Bai

2023

Preprint

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The difference in the degree of rock weathering has always been an important concern in tunnel engineering. In view of the randomness and ambiguity of determining the degree of rock weathering, four quantitative indicators including wave velocity ratio Kv, weathering coefficient Kf, cohesion c and chemical alteration index CIA are selected to establish an evaluation index system. The entropy weight method is used to determine the weight of each index, and the collective cloud model theory is used to establish a quantitative prediction model of the weathering degree of carbonaceous mudstone. Comparing five groups of engineering examples with the established model, it is found that there are deviations in the results of the two groups. The reason for this result is that the traditional determination of the degree of rock weathering is uncertain, and there is no unified standard for quantitative analysis. The entropy weight-normal cloud model comprehensively considers multiple influencing factors, eliminates uncertainty as much as possible, and gives the results of quantitative analysis, which has good practicability and reliability. It can provide a new idea for the weathering degree of carbonaceous mudstone.

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Study on modified pre-disintegrated carbonaceous mudstone triaxial test and binary medium model

Fu,

Yang,

et al. 2024

Granular Matter

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Mechanical Properties and Deterioration Mechanism of Remolded Carbonaceous Mudstone Exposed to Wetting–Drying Cycles

Cited by 10 publications

References 38 publications

The Effect of Wetting–Drying Cycles on the Deterioration of the Physical and Mechanical Properties of Cemented Paste Backfill in Open-Pit Coal Mines

The Effect of Wetting–Drying Cycles on the Deterioration of the Physical and Mechanical Properties of Cemented Paste Backfill in Open-Pit Coal Mines

Research on Prediction of Weathering Degree of Carbonaceous Mudstone Based on Entropy Weight-Cloud Model

Study on modified pre-disintegrated carbonaceous mudstone triaxial test and binary medium model

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