水-力耦合非饱和黄土的弹塑性模型适用性研究

doi:10.16285/j.rsm.2022.0457

Rock and Soil Mechanics ›› 2023, Vol. 44 ›› Issue (S1): 436-442.doi: 10.16285/j.rsm.2022.0457

• Fundamental Theroy and Experimental Research • Previous Articles Next Articles

Applicability of unsaturated loess to hydraulic coupling elastoplastic model

SHAO Shuai^{1, 2}, SHAO Sheng-jun^{1, 2}, GAO Meng-jie¹, LIU Xiao-kang¹, WANG Li-xin^{1, 3}, YAN Guang-yi³

1. Institute of Geotechnical Engineering, Xi’an University of Technology, Xi’an, Shaanxi 710048, China; 2. Shaanxi Key Laboratory of Loess Mechanics and Engineering, Xi’an University of Technology, Xi’an, Shaanxi 710048, China； 3. China Railway First Railway Survey and Design Institute Group Co., Ltd., Xi’an, Shaanxi 710043, China

Received:2022-04-07 Accepted:2022-07-15 Online:2023-11-16 Published:2023-11-19
Supported by:
This work was supported by the National Natural Science Foundation of China(52108342), the Shaanxi Province Natural Science Foundation Research Program-Hanjiang-Weihe Joint Fund Project (2019JLP-21, 2019JLZ-13), the Ph.D. Launch Fund of Xi’an University of Technology(107-451122001).

Abstract

Abstract: The aim of this article is to validate the predictive effectiveness of Sun's proposed coupled hydraulic-mechanical intrinsic model for unsaturated soils with respect to the density state. The loess in the eastern suburbs of Xi’an City, Shaanxi Province was selected as the research object. The isotropic compression test, triaxial compression test and triaxial tensile test were carried out on unsaturated loess samples. The model prediction results were compared with the experimental results, which confirmed the validity of the model proposed by Sun to predict the stress-strain and water-holding behavior of unsaturated loess. The experimental results show that the loading-collapsing (LC) yield curves obtained by Sun model and BBM model were compared, and it was found that the prediction results of Sun model were closer to the experimental data points. The loess samples with different initial void ratios were subjected to isotropic compression tests and humidified, and Sun model could better predict the collapsible deformation trend of loess. Comparing the prediction results of the model with the results of triaxial compression test and triaxial compression test of unsaturated loess, it was confirmed that the model could better predict the stress-strain behavior of unsaturated loess, and depict the change of saturation degree.

Key words: loess, unsaturated soil, elastic-plastic, hydraulic coupling

CLC Number:

TU 444

SHAO Shuai, SHAO Sheng-jun, GAO Meng-jie, LIU Xiao-kang, WANG Li-xin, YAN Guang-yi, . Applicability of unsaturated loess to hydraulic coupling elastoplastic model[J].Rock and Soil Mechanics, 2023, 44(S1): 436-442.

References

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