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Structural Strength Deterioration Characteristics and a Model of Undisturbed Loess under the Action of Wetting and Freeze-Thaw Cycles

Author

Listed:
  • Haicheng She
  • Zaiqiang Hu
  • Zhan Qu
  • Hongru Li
  • Hu Guo
  • Xiaoli Ma

Abstract

Undisturbed loess is affected by external environmental disturbances, such as wetting and freeze-thaw cycles, which cause microstructural changes that have an important impact on the structural strength of the loess. These changes in turn affect the stability of structures such as embankments, slopes, and guards. This article takes the Q 3 undisturbed loess in Lintong District, Xi’an, as an example. The effects of wetting and freeze-thaw cycles on the loess expansion ratio and pore structure were studied by wetting tests, freeze-thaw cycle tests, and scanning electron microscopy (SEM). The changes in the compression index and compression modulus were studied by a confined compression test. The loess e -lg p compression curve was obtained according to the confined compression test, and the newly defined concepts of the loess structural strength, residual structural strength, and structural strength damage variable, in addition to the e -lg p compression curve, were combined with the experimental data to calculate the damage value generated by the disturbance during the sampling and preparation of loess. The deterioration of the structural strength and damage variable of loess was analyzed. Based on the microscopic statistical damage theory and Weibull distribution, the model used the volume expansion ratio as a variable to establish a statistical damage model under wetting and freeze-thaw cycles. Finally, on the basis of the test, the model parameters were determined. The models were verified by taking loess from a foundation pit in the northern suburbs of Xi’an and were in good agreement with the results of the test. Ultimately, the models have good practicability and can provide guidance for engineering design and construction.

Suggested Citation

  • Haicheng She & Zaiqiang Hu & Zhan Qu & Hongru Li & Hu Guo & Xiaoli Ma, 2019. "Structural Strength Deterioration Characteristics and a Model of Undisturbed Loess under the Action of Wetting and Freeze-Thaw Cycles," Mathematical Problems in Engineering, Hindawi, vol. 2019, pages 1-23, December.
  • Handle: RePEc:hin:jnlmpe:4790250
    DOI: 10.1155/2019/4790250
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    Cited by:

    1. Yanxiao Mu & Zizhao Zhang & Tiansheng Zhou & Zekun Guo, 2023. "Effect of Mica Content on Mechanical Properties of Yili River Valley Loess under the Impact of Freezing and Thawing," Sustainability, MDPI, vol. 15(4), pages 1-16, February.
    2. Zhenxing Pan & Gengshe Yang & Wanjun Ye & Hui Liu & Bo Liang & Qian Yang & Gang Li, 2023. "Effect of Freeze–Thaw Cycles and Initial Water Content on the Pore Structure and Mechanical Properties of Loess in Northern Shaanxi," Sustainability, MDPI, vol. 15(14), pages 1-19, July.

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