Disintegration characteristics and mechanism of red-bed argillaceous siltstone under drying–wetting cycle

Huang, Kai; Kang, Bo; Zha, Fusheng; Li, Yunfeng; Zhang, Qing; Chu, Chengbin

doi:10.1007/s12665-022-10450-5

Cited by 23 publications

(12 citation statements)

References 41 publications

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“…Te red-bed soft rock slope is widely distributed in south China, which is easy to be weathered, disintegrated, and softened by water [1][2][3]. Most of the red-bed soft rocks can disintegrate into soil under open air or dry-wet cycle, and some even disintegrate immediately after immersion in water, or even muddy with poor engineering geological properties [4,5].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Mechanical Properties and Slope Stability of Red Bed Soft Rock: A Case Study in Xinjiang Irrigation Diversion Channel

Gao

Chen

et al. 2022

Advances in Civil Engineering

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The channel slope in the red-bed soft rock area is prone to instability and collapse due to the influence of the channel flow movement, rainfall, weathering, and other factors. Under long-term operation conditions, the sediment stripped from the channel side wall is liable to silt along the process of water flow transportation in the channel, which seriously leads to elevation of the channel bottom, increase of channel width, and reduction of the horseway, which affect the normal water conveyance and operation safety of channels. In view of the collapse and instability of Zhetang diversion irrigation channel project in Xinjiang hydraulic project, through on-site sampling and indoor rock mechanics test, the strength mechanical parameters of slope rock samples are obtained, and the indoor rheological test is carried out, and the triaxial rheological law is obtained. Under different levels of stress, the axial creep strain accounts for more than 50% of the total axial strain, indicating that the rheological effect of sample rock is obvious. Based on the strength parameters of rock samples, a numerical model is established. The stability of red-bed soft rock channel bank slope is studied by using the strength reduction method of finite element method. The seepage field of channel slope under conventional working conditions is analyzed, and the slope stability under different operating conditions is compared and calculated. The results show that the slope stability safety factor of Zhetang diversion irrigation channel slope is 1.60 under conventional working conditions and 1.33 under check working conditions, which are greater than the recommended value in the specification.

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Section: Introductionmentioning

confidence: 99%

Analysis of Mechanical Properties and Slope Stability of Red Bed Soft Rock: A Case Study in Xinjiang Irrigation Diversion Channel

Gao

Chen

et al. 2022

Advances in Civil Engineering

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“…Slaking tests are commonly used to assess the slaking characteristics of clays because they allow visualization of the slaking process of clay blocks and obtain the time-varying parameters of slaking (Moriwaki and Mitchell 1997;Du et al 2022;Huang et al 2022). As shown in Fig.…”

Section: Slaking Testsmentioning

confidence: 99%

Soil Slaking under the effect of dispersants: characteristics and mechanism

Wang,

Zhu,

Liu

et al. 2024

Preprint

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The adhesion of clay to the cutterhead and cutters presents a significant challenge during EPB shield excavation in clay strata. Dispersants are widely used to disintegrate clay adhering to metal surfaces, but their conditioning characteristics and working mechanisms remain elusive. This study investigates the effect of organic and inorganic dispersants on clay plasticity and slaking characteristics through Atterberg limit and slaking tests, complemented by Zeta potential and swelling tests to explore underlying mechanisms. The results demonstrate that increasing the content of inorganic and organic dispersants reduces soil plasticity and enhances the slaking rate during the rapid development period in pure water. Dispersion slaking occurs in soil blocks treated with inorganic dispersant in pure water, while soil blocks treated with organic dispersant primarily undergo surface slaking. A higher organic dispersant concentration significantly intensified the slaking rate. In contrast, inorganic dispersant solutions inhibit soil slaking. Inorganic dispersant solutions impede soil expansion and slaking due to reduced electrostatic repulsion and increasing difficulty in water infiltration. Conversely, organic dispersant solutions accelerate soil slaking by promoting soil expansion and solution infiltration, reducing surface tension, and increasing pore air pressure. The results may suggest injecting organic dispersant for removal of existing soil clogging in shield tunneling, but both inorganic and organic dispersants can serve to prevent the occurrence of soil clogging for shield tunnelling.

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“…The cementation 5 Geofluids region between particles is continually split due to the continuous initiation, extension, and penetration of fractures, which finally leads to the progressive loss of cementation between particles, as seen in Figures 7(e) and 7(f). Due to ion exchange and hydrolysis, feldspar in neutral aqueous solution can create new clay minerals such as kaolinite and silica colloid [19]. Furthermore, calcium oxide in red sandstone will react with water.…”

Section: Micromorphological Characteristics Of Red Sandstonementioning

confidence: 99%

Experimental Study of the Dynamic Mechanical Behavior and Degradation Mechanism of Red Sandstone in Acid Dry-Wet Cycles

Sun

Cheng

2023

Geofluids

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In this paper, the slit Hopkinson pressure bar (SHPB) experiments were conducted to investigate the dynamic mechanical characteristics of red sandstone during acid dry-wet cycles. The appearance of the samples was evaluated using scanning electron microscopy, and the process of red sandstone degradation under acid dry-wet cycles was examined. The results reveal that, as compared to neutral solution, acid solution enhances the degree of degradation induced by dry-wet cycles in red sandstone. The dynamic compressive strength and elastic modulus of red sandstone steadily decline as the number of dry-wet cycles increases, and the lower the pH of solution, the greater the reduction. The mechanism of degradation of red sandstone during acid dry-wet cycles may be explained in two ways. First, the chemical interaction between the mineral components in the sample, such as cement and feldspar, and H+ in the acid solution has accelerated the formation of secondary pores and fractures, resulting in a decrease in the cementation capacity between mineral particles. Second, partial breakdown of the major mineral particles softens the mineral skeleton.

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Disintegration characteristics and mechanism of red-bed argillaceous siltstone under drying–wetting cycle

Cited by 23 publications

References 41 publications

Analysis of Mechanical Properties and Slope Stability of Red Bed Soft Rock: A Case Study in Xinjiang Irrigation Diversion Channel

Analysis of Mechanical Properties and Slope Stability of Red Bed Soft Rock: A Case Study in Xinjiang Irrigation Diversion Channel

Soil Slaking under the effect of dispersants: characteristics and mechanism

Experimental Study of the Dynamic Mechanical Behavior and Degradation Mechanism of Red Sandstone in Acid Dry-Wet Cycles

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