Research Article
Collapsibility and Collapse Assessment of Loess Under Unloading Effect of Malan Loess in Longdong
@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
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.