Proceedings of the International Conference on Industrial Design and Environmental Engineering, IDEE 2023, November 24–26, 2023, Zhengzhou, China

Research Article

Collapsibility and Collapse Assessment of Loess Under Unloading Effect of Malan Loess in Longdong

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  • @INPROCEEDINGS{10.4108/eai.24-11-2023.2343444,
        author={Zhimin  Chen and Yipu  Yang and Yanyu  Hao},
        title={Collapsibility and Collapse Assessment of Loess Under  Unloading Effect of Malan Loess in Longdong },
        proceedings={Proceedings of the International Conference on Industrial Design and Environmental Engineering, IDEE 2023, November 24--26, 2023, Zhengzhou, China},
        publisher={EAI},
        proceedings_a={IDEE},
        year={2024},
        month={2},
        keywords={malan loess; collapse settlement; collapsibility coefficient; collapse  assessment},
        doi={10.4108/eai.24-11-2023.2343444}
    }
    
  • Zhimin Chen
    Yipu Yang
    Yanyu Hao
    Year: 2024
    Collapsibility and Collapse Assessment of Loess Under Unloading Effect of Malan Loess in Longdong
    IDEE
    EAI
    DOI: 10.4108/eai.24-11-2023.2343444
Zhimin Chen1, Yipu Yang1,*, Yanyu Hao2
  • 1: Lanzhou Jiaotong University
  • 2: Gansu Hengtong Road and Bridge Engineering Co, Ltd
*Contact email: 11210172@stu.lzjtu.edu.cn

Abstract

Unloading collapsible conditions are common in self-weight collapsible loess sites. But loess collapse settlement is generally evaluated without considering the influence of unloading. So, Malan loess in Longdong as the object of study, unloading collapsible tests under different pressures were set up, after derivation, the expression of loess collapsibility coefficient under unloading condition is established. The results showed that:(1) With the increase of unloading amounts, the collapsibility coefficient of loess gradually decreases. (2) The calculation formula of unloading collapsibility coefficient expressed by collapsible completion ratio, unloading stress ratio and unloading collapsible attenuation coefficient can make the calculation result of unloading collapse settlement more accurately. (3) Based on the experimental control group, the formula is further improved, and the parameter values in the expression are corrected. The formula can be used to calculate the unloading collapsibility coefficient of Longdong Malan loess (Q3) under different initial pressures under any collapsible completion ratio and unloading stress ratio. By comparing the experimental values with the calculated values, the rationality and accuracy of the derived expression are verified. The method for determining the influence coefficient of loess collapsibility considering unloading effect is obtained , and the evaluation system of collapsibility is further supplemented and verified.