Time-Dependence of the Mechanical Behavior of Loess after Dry-Wet Cycles

Liu, Kai; Gu, Tianfeng; Wang, Xingang; Wang, Jiading

doi:10.3390/app12031212

Cited by 6 publications

(3 citation statements)

References 47 publications

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“…Compressive, tensile, and shear tests were carried out using an electro-hydraulic servo press, and the effects of different dry-wet cycles and curing ages on the mechanical properties of the specimens were analyzed. In addition, SEM equipment was used to ascertain the development of cracks in the specimens after the dry-wet cycles [44]. The conclusions are as follows:…”

Section: Discussionmentioning

confidence: 99%

An Experimental Study on the Mechanical Properties and Microstructure of the Cemented Paste Backfill Made by Coal-Based Solid Wastes and Nanocomposite Fibers under Dry–Wet Cycling

Wang,

Cheng,

Zhou

et al. 2024

Materials

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The mechanical properties and microstructure of the cemented paste backfill (CPB) in dry–wet cycle environments are particularly critical in backfill mining. In this study, coal gangue, fly ash, cement, glass fiber, and nano-SiO2 were used to prepare CPB, and dry–wet cycle tests on CPB specimens with different curing ages were conducted. The compressive, tensile, and shear strength of CPB specimens with different curing ages under different dry–wet cycles were analyzed, and the microstructural damage of the specimens was observed by scanning electron microscopy (SEM). The results show that compared with the specimens without dry–wet cycles, the uniaxial compressive strength, tensile strength, and shear strength of the specimens with a curing age of 7 d after seven dry–wet cycles were the smallest, being reduced by 40.22%, 58.25%, and 66.8%, respectively. After seven dry–wet cycles, the compressive, tensile, and shear strength of the specimens with the curing age of 28 d decreased slightly. The SEM results show that with the increasing number of dry–wet cycles, the internal structure of the specimen becomes more and more loose and fragile, and the damage degree of the structural skeleton gradually increases, leading to the poor mechanical properties of CPB specimens. The number of cracks and pores on the specimen surface is relatively limited after a curing age of 28 d, while the occurrence of internal structural damage within the specimen remains insignificant. Therefore, the dry–wet cycle has an important influence on the both mechanical properties and microstructure of CPB. This study provides a reference for the treatment of coal-based solid waste and facilitates the understanding of the mechanical properties of backfill materials under dry–wet cycling conditions.

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Section: Discussionmentioning

confidence: 99%

An Experimental Study on the Mechanical Properties and Microstructure of the Cemented Paste Backfill Made by Coal-Based Solid Wastes and Nanocomposite Fibers under Dry–Wet Cycling

Wang,

Cheng,

Zhou

et al. 2024

Materials

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“…However, due to the periodicity and concentration period of rainfall, the surface loess and even the deep loess undergo a saturated-unsaturated dry-wet cycle during rainfall-evaporation [63,64]. According to a large number of research data [65,66], dry-wet cycles can deteriorate the mechanical properties of loess and change the microstructure of loess, resulting in a decrease in loess strength, destruction, and deformation, which impacts the disintegration of loess.…”

Section: Freeze-thaw Cycle and Dry-wet Cyclementioning

confidence: 99%

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

Chen,

Li,

Wang

et al. 2024

Sustainability

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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.

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“…Due to the direct and evident impact of loess collapse sensitivity on engineering construction, researchers have focused on this topic for a long time and have achieved in-depth understanding [7][8][9]. Various explanations have been proposed for the mechanisms of loess collapse sensitivity, including the solublesalt hypothesis [10], colloid-deficiency theory [11,12], capillary hypothesis [13], underconsolidation theory [14], and structural theory [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Water Sensitivity and Structural Properties of Loess

Zhang,

Hu,

et al. 2024

Advances in Civil Engineering

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Loess has unique water sensitivity due to its distinct formation environment. The structure of loess is undercompactness, weak cementation, and porousness. The water sensitivity of loess directly leads to many environmental problems and geological hazards, including subgrade subsidences, slope collapse or failures, and building cracking. To reveal the relationship between water sensitivity and loess structure, confined-compression collapsibility tests and triaxial-collapsibility tests were performed on loess in different areas. The collapsibility coefficient, porosity ratio, and collapsibility rate were analyzed. Results show that the collapsibility process of loess can be divided into three stages: wetting, softening, and settling. The collapsibility sensitivity of loess is determined primarily by its structural and hydraulic state.

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Time-Dependence of the Mechanical Behavior of Loess after Dry-Wet Cycles

Cited by 6 publications

References 47 publications

An Experimental Study on the Mechanical Properties and Microstructure of the Cemented Paste Backfill Made by Coal-Based Solid Wastes and Nanocomposite Fibers under Dry–Wet Cycling

An Experimental Study on the Mechanical Properties and Microstructure of the Cemented Paste Backfill Made by Coal-Based Solid Wastes and Nanocomposite Fibers under Dry–Wet Cycling

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

Water Sensitivity and Structural Properties of Loess

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