Water–soil chemical mechanism and soil structural stability of expansive soil under the action of acid rain infiltration

Chang, Jin; Xu, Yongfu; Xiao, Jie; Wang, Lei; Jiang, Jingwen

doi:10.1007/s10064-022-02933-3

Cited by 5 publications

(3 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Their content directly influences the disintegration, solubility, swelling, adhesion, permeability, and stability of loess [80,81]. The primary water-soil chemical interactions during loess disintegration under acidic conditions are dissolution [18,27,28,35,82] and cation exchange and adsorption [83].…”

Section: Water-soil Chemical Interactionsmentioning

confidence: 99%

Unraveling the Mystery of Water-Induced Loess Disintegration: A Comprehensive Review of Experimental Research

Chen,

Li,

Wang

et al. 2024

Sustainability

View full text Add to dashboard Cite

Loess disintegration is a significant physicochemical and mechanical dissolution process that occurs when loess comes into contact with water. This phenomenon contributes to geological disasters such as loess cave erosion, landslides, and debris flows. The disintegration of loess can be influenced by both internal and external factors. Research on internal factors of loess disintegration has been widely recorded, but the research progress on external environmental factors that affect loess disintegration is not well summarized. This review summarizes the impacts of external water environmental factors on loess disintegration and reveals that six external water environmental factors, namely the temperature of the aqueous solution, hydrodynamic conditions, solution pH, salt concentration and type in the solution, freeze–thaw cycles, and dry–wet cycles, can significantly impact loess disintegration. Furthermore, this review delves into three key research areas in loess disintegration under the influence of these water environmental factors: experimental research on loess disintegration, the disintegration parameters used in such research and their variations, and the water–soil chemical reactions and microstructural changes during loess disintegration. It concludes that current experimental research on loess disintegration suffers from inadequate studies, with existing research associated with poor comparability and weak representativeness, and a lack of comprehensive, systematic analysis of its regularities of influence and response mechanisms from both microscopic and macroscopic perspectives. This paper can provide valuable insights for the prevention of loess geological disasters and engineering safety construction.

show abstract

Section: Water-soil Chemical Interactionsmentioning

confidence: 99%

Unraveling the Mystery of Water-Induced Loess Disintegration: A Comprehensive Review of Experimental Research

Chen,

Li,

Wang

et al. 2024

Sustainability

View full text Add to dashboard Cite

show abstract

“…During this process, the content of the soluble colloids produced by hydration gradually increased and reached a peak. Since soluble colloids strengthen the connection between soil particles [52,53], uniaxial tensile strength also increased (see Figure 11). The hydration mechanism of the hydrophilic mineral components in expansive soils is shown in Figure 17.…”

Section: Mechanism Analysis 41 Mechanistic Analysis Of Changes In Uni...mentioning

confidence: 99%

“…(2) According to the analysis of the uniaxial tensile strength mechanism, with the increase in saturation degree, the content of the soluble colloid produced by the hydration of hydrophilic mineral components first increased and then decreased. Due to the existence of colloids, the connection between soil particles can be strengthened [52], which makes the structure of the specimens more stable. Therefore, the unconfined compressive strength first increased and then decreased with the increase in the saturation degree.…”

Section: Mechanistic Analysis Of Changes In Unconfined Compressive St...mentioning

confidence: 99%

Effect of Saturation Degree on Mechanical Behaviors of Shallow Unsaturated Expansive Soils

Hong

Chen

et al. 2022

Sustainability

View full text Add to dashboard Cite

In the southwest of China, there are widely distributed expansive soils. However, to save costs and manage the speed of construction, these shallow expansive soils are often filled with subgrade materials. Therefore, it is necessary to clearly understand the mechanical behaviors of unmodified shallow expansive soils. Current research on the mechanical behaviors of shallow expansive soils is mainly focused on shear and compressive strengths but rarely on the tensile strength since general tests are costly, time consuming, and difficult to conduct. Therefore, uniaxial tensile, unconfined compression and direct shear tests were carried out to study the mechanical behavior of shallow unsaturated expansive soils under different saturation degrees, and the tests analyzed the change mechanism of its mechanical behavior. The following were found: (1) with an increase in saturation degree, the uniaxial tensile strength, unconfined compressive strength, shear strength, cohesive force, and internal friction angle first increased and then decreased; (2) when the saturation degree increased from 18.7% to the saturation degree corresponding to the peak, the uniaxial tensile strength, unconfined compressive strength, cohesive force, and internal friction angle increased by about 11 times, 3.24 times, 2.34 times, and 0.52 times, respectively; (3) when the saturation degree increased from the saturation degree corresponding to the peak to 80.3%, they decreases by about 42%, 51.4%, 36%, and 50%, respectively; (4) with the increase in dry density, the saturation degree corresponding to the peak of uniaxial tensile strength gradually increased, while the saturation degree corresponding to the peak of unconfined compressive and shear strength did not significantly change.

show abstract

Instability evolution of expansive soil slope due to short duration-varying intensities of rainfall

Li,

2024

Engineering Failure Analysis

View full text Add to dashboard Cite

Water–soil chemical mechanism and soil structural stability of expansive soil under the action of acid rain infiltration

Cited by 5 publications

References 16 publications

Unraveling the Mystery of Water-Induced Loess Disintegration: A Comprehensive Review of Experimental Research

Unraveling the Mystery of Water-Induced Loess Disintegration: A Comprehensive Review of Experimental Research

Effect of Saturation Degree on Mechanical Behaviors of Shallow Unsaturated Expansive Soils

Instability evolution of expansive soil slope due to short duration-varying intensities of rainfall

Contact Info

Product

Resources

About