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2024 Vol. 30, No. 6
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LIU Jianlei, WEI Tongyao, HUI Hanbin, JIANG Yaofei. 2024. Analysis of soaking deformation characteristics of large-thickness discontinuous collapsible loess. Journal of Geomechanics, 30(6): 921-932. doi: 10.12090/j.issn.1006-6616.2023174
Citation: LIU Jianlei, WEI Tongyao, HUI Hanbin, JIANG Yaofei. 2024. Analysis of soaking deformation characteristics of large-thickness discontinuous collapsible loess. Journal of Geomechanics, 30(6): 921-932. doi: 10.12090/j.issn.1006-6616.2023174
shu

Analysis of soaking deformation characteristics of large-thickness discontinuous collapsible loess

  • Yellow River Engineering Consulting Co., Ltd., Zhengzhou 450003, Henan, China

    • Fund Project: This research is financially supported by the China Postdoctoral Science Foundation Project (Grant No. 2021M691186).
More Information
Received Date:  25 October 2023
Revised Date:  25 April 2024
Accepted Date:  25 April 2024
Available Online:  17 May 2024
Publish Date:  28 December 2024
    Abstract
  • Objective

    The unique stratigraphic structure of the widely distributed discontinuous loess stratum in the Guanzhong Plain area of China results in significant differences between the indoor calculated values and field-measured values of the self-weight wetting amount for evaluating the foundation’s wetting property.

    Methods

    Indoor wetting tests and large-scale test pit immersion tests were carried out on-site to compare the factors influencing the difference between on-site and indoor wetting amounts, with the loess stratum on the north bank of the Weihe River as the research object.

    Results

    The following results were obtained from the study: (1) The ratio of self-weight wet depressions between field and indoor test was less than 0.1. This discrepancy was due to the discontinuity and inhomogeneity of loess layers, sampling disturbances in indoor tests, and differing immersion conditions in field test. (2) The “layer bow effect” caused by the discontinuity of loess was the main reason for the difference between the indoor and field tests. This effect weakened upward-transmitted deformation, hindered downward-transmitted gravity stress, and caused discontinuity in the percolation process. (3) Stratification calculations for the four test sites showed that most of the gravitational self-wetting in the field tests occurred in the Qp3 soil layer, while the Qp2 loess layer showed large difference between the field-measured and indoor test values. Thus, the Qp2 loess layer has little to no wetting effect.

    Conclusion

    The shape of the saturated zone range obtained through numerical simulation was consistent with the field test results, and the numerical simulation method was more advantageous for observing the experimental results. When calculating wet subsidence by self-weight, a stratification method based on the strata age can be used. For the Qp3 stratum, the correction coefficient method specified in the guidelines was chosen, while the Qp2 loess stratum was determined by an on-site pit immersion test.

    Significance

    The research methodology used in this study provides theoretical guidance for future engineering constructions on the Guanzhong Plain.
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