The Duncan-Chang statistical damage correction model of unsaturated soil considering matric suction

TAN Weijia; WEI Yunjie; WANG Junhao; GAO Jingxuan

doi:10.16030/j.cnki.issn.1000-3665.202105022

2022 Vol. 49, No. 1

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TAN Weijia, WEI Yunjie, WANG Junhao, GAO Jingxuan. The Duncan-Chang statistical damage correction model of unsaturated soil considering matric suction[J]. Hydrogeology & Engineering Geology, 2022, 49(1): 84-91. doi: 10.16030/j.cnki.issn.1000-3665.202105022

Citation:

TAN Weijia, WEI Yunjie, WANG Junhao, GAO Jingxuan. The Duncan-Chang statistical damage correction model of unsaturated soil considering matric suction[J]. Hydrogeology & Engineering Geology, 2022, 49(1): 84-91. doi: 10.16030/j.cnki.issn.1000-3665.202105022

The Duncan-Chang statistical damage correction model of unsaturated soil considering matric suction

1.
College of Geological Engineering and Geomatics, Chang’an University, Xi’an, Shaanxi　710054, China
2.
China Institute of Geo-Environment Monitoring, Beijing　100081, China)

More Information

Corresponding author: WEI Yunjie, an58008703722@163.com

Received Date: 17 May 2021

Revised Date: 09 September 2021

Publish Date: 15 January 2022

Abstract

Abstract

In order to reflect the whole deformation process of unsaturated foundation soil, the consolidated drained triaxial compression test is carried out on the unsaturated soil of a foundation project. It is found that the partial stress-strain curve of unsaturated soil is similar to hyperbola, and the matrix suction has an obvious influence on the mechanical behavior of soil. The greater the matrix suction, the higher the partial stress of soil. According to the deformation characteristics and engineering characteristics of unsaturated soil, the Duncan-Chang hyperbolic model is selected as the basic model, and the statistical damage theory is introduced. Assuming that the micro element strength of unsaturated soil obeys the Weibull probability density distribution, the Duncan-Chang statistical damage model is established. By establishing the relationship between the initial tangent modulus and matrix suction, a new Duncan-Chang statistical damage model of the unsaturated soil considering matrix suction is established. The parameter analysis method is given, and the empirical expression of the Weibull distribution parameters is obtained, which is used to modify the model. The damage accumulation law of unsaturated soil under different matrix suction conditions is analyzed, and the partial stress-strain test curve of unsaturated soil is compared with the traditional Duncan-Chang model, which proves the feasibility and rationality of the model. The research results provide a certain reference for the study of mechanical properties and identification simulation of unsaturated soil.
- unsaturated soil /
- matric suction /
- initial tangent modulus /
- Duncan-Chang model /
- statistical damage

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References

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