Damage evolution characteristics and deterioration mechanism of mechanical properties of sandstone subjected to drying-wetting cycles

Ma, Tianshu; Liu, Huihui; Zou, Quanle; Kong, Fanjie; Ran, Qican; Wang, Pingting

doi:10.1016/j.jmrt.2023.02.068

Cited by 30 publications

(4 citation statements)

References 26 publications

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“…Coal has accounted for a high proportion of China’s primary energy production and consumption, and the main position and ballast role of coal in China’s energy system are not easy to change. Coal mining to the deep will become the new normal to ensure China’s energy demand. − After coal mining into the deep, the coal seam has high ground stress, strong gas adsorption, and low permeability, and the mining environment has undergone great changes, − resulting in more and more serious coal and gas outburst disasters.…”

Section: Introductionmentioning

confidence: 99%

Influence of Nanoparticle–Surfactant Compound Solution on Coal Wettability

Zou,

Huo,

Liu

et al. 2024

Energy Fuels

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Poor coal wettability limits the effectiveness of water injection in coal seams. Nanofluids and surfactants can improve the coal wettability. In this paper, the impact of four types of composite fluids containing surfactants and SiO 2 nanoparticles on coal wettability was investigated. By analyzing the variation in contact angle and moisture content as well as functional groups before and after modification, it is found that the compound solution can effectively enhance coal surface wettability and increase the moisture content of coal samples. Compared to deionized water and SiO 2 nanofluids, the contact angle of coal modified by the compound solution does not rebound quickly with the loss of moisture. Moreover, the average strengthening rate and water absorption mass strengthening rate were utilized to quantify the modification effects of the compound solution. It can be seen that the combination of cationic surfactant CTAB with SiO 2 nanoparticles provides the most effective modification. FTIR results imply that the modification results in increased activity of free hydroxyl groups in the coal, enhancing its hydrophilicity. The synergistical interaction of nanoparticles and surfactants can occupy vacant adsorption sites on the coal surface. Additionally, surfactants adhere to the nanoparticle surface due to van der Waals forces, while hydrophilic groups attract water molecules to the coal. The research achievements provide a theoretical foundation for the potential application of nanoparticle−surfactant compound solution in coal seam water injection.

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Section: Introductionmentioning

confidence: 99%

Influence of Nanoparticle–Surfactant Compound Solution on Coal Wettability

Zou,

Huo,

Liu

et al. 2024

Energy Fuels

Self Cite

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show abstract

“…Coal, as one of the important fossil energy resources, is an essential resource in the industrialization and urbanization processes. − In recent years, shallow resources have been gradually depleted with the growing mining intensity, and deep mining has become normal. − However, deep underground mines feature great geostress and high gas concentration, so the gas content is likely to exceed the limit and gas disasters including rock and gas outbursts occur frequently. , Water injection in coal seams is one of the effective measures to control gas and has been extensively applied to coal mining. − Injecting high-pressure water in coal seams through boreholes to wet and soften coal seams before mining can distribute stress uniformly, enhance the plasticity of coal, and reduce the release of elastic potential energy, thus further eliminating or decreasing the risk of coal and gas outbursts, − whereas numerous research studies have shown that coal has strong hydrophobicity and deep coal seams have poor gas permeability, so water is difficult to absorb by coal seams. This may lead to waste of a huge amount of water resources and a poor water injection effect. − Therefore, increasing the wettability of coal seams is the key to improving the water injection effect in the coal seams.…”

Section: Introductionmentioning

confidence: 99%

Study of Time-Varying Laws of Stability and Wettability of SiO₂–H₂O Nanofluids with Different Particle Sizes

Zhao,

Tian,

Xie

et al. 2023

Ind. Eng. Chem. Res.

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It has been proven that SiO2–H2O nanofluids have great application potential for water injection in coal seams. To explore the influences of the particle size on the stability and wettability of SiO2–H2O nanofluids, sedimentation observation of nanoparticles (NPs), viscosity tests, pH tests, surface tension tests, and contact angle tests were performed for SiO2–H2O nanofluids with different particle sizes. The research shows that the larger the particle size of SiO2 NPs, the more obvious the aggregation and sedimentation of NPs. The smaller the particle size of SiO2 NPs is, the lower the surface tension and contact angle of the SiO2–H2O nanofluids. As time goes on, SiO2–H2O nanofluids successively show time-varying characteristics in the low stability stage, moderate stability stage, and high stability stage. Therein, the low stability stage is the optimal period for enhancing the water injection in coal seams by nanofluids. The research provides theoretical support for using SiO2–H2O nanofluids to enhance water injection in coal seams.

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“…As one of the main energy sources supporting the development of China's national economy, coal is the "ballast stone" to ensure energy security (Liang et al, 2022;Sun X. Y. et al, 2023;Ma et al, 2023). Coal consumption will account for 56% of total energy consumption in 2021.…”

Section: Introductionmentioning

confidence: 99%

Regional outburst prevention technology of pre-drainage gas area in west well area of sihe coal mine

Zhang

2023

Front. Energy Res.

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Coal and gas outburst is one of the main factors affecting the safe and efficient production of coal mines. With the increase of mining depth and mining speed, the dynamic phenomena of coal and gas outburst will become more and more serious. Through the study of various outburst prevention measures in the pre-drainage gas area such as surface drilling, bedding (directional) drilling, and cross-layer drilling, combined with the coal seam occurrence and mining technology of the West Mine Area, a feasible regional pre-drainage comprehensive outburst prevention mode suitable for the characteristics of the 3# coal seam in the West Mine Area has been obtained. This mode is based on pre-pumping of surface drilling first, directional long borehole along the reservoir and pre-pumping of cross-zone borehole, which provides reliable guarantee for safe and efficient production in outburst well area.

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Damage evolution characteristics and deterioration mechanism of mechanical properties of sandstone subjected to drying-wetting cycles

Cited by 30 publications

References 26 publications

Influence of Nanoparticle–Surfactant Compound Solution on Coal Wettability

Influence of Nanoparticle–Surfactant Compound Solution on Coal Wettability

Study of Time-Varying Laws of Stability and Wettability of SiO₂–H₂O Nanofluids with Different Particle Sizes

Regional outburst prevention technology of pre-drainage gas area in west well area of sihe coal mine

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Damage evolution characteristics and deterioration mechanism of mechanical properties of sandstone subjected to drying-wetting cycles

Cited by 30 publications

References 26 publications

Influence of Nanoparticle–Surfactant Compound Solution on Coal Wettability

Influence of Nanoparticle–Surfactant Compound Solution on Coal Wettability

Study of Time-Varying Laws of Stability and Wettability of SiO2–H2O Nanofluids with Different Particle Sizes

Regional outburst prevention technology of pre-drainage gas area in west well area of sihe coal mine

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Product

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Study of Time-Varying Laws of Stability and Wettability of SiO₂–H₂O Nanofluids with Different Particle Sizes