Study on elasto-plastic constitutive relation of bioenzyme-treated expansive soil based on LADE-DUNCAN model

被引：1

作者：

Wen C. ^{[1
,2
]}

机构：

[1] School of Civil Engineering, Central South University of Forestry and Technology, Changsha

[2] Hunan Engineering Laboratory for Manufacturing and Application Technology of Modern Timber Structural Engineering Materials, Central South University of Forestry and Technology, Changsha

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2021年 / 52卷 / 11期

关键词：

Bioenzyme-treated expansive soil; Elasto-plastic constitutive; LADE-DUNCAN model;

D O I：

10.11817/j.issn.1672-7207.2021.11.038

中图分类号：

学科分类号：

摘要：

The elasto-plastic stress-strain behavior of bioenzyme-treated expansive soil was studied based on LADE-DUNCAN model. Firstly, according to a series of the triaxial consolidated drained shear tests of bioenzyme-treated expansive soil at different percentages of bioenzyme, the test curves including deviator stress q and axial strain ε1, bulk strain εV, lateral strain ε3 were obtained, respectively. Secondly, bond stress σ0 was used to modify LADE-DUNCAN yield criterion. Finally, the expressions between the parameters of LADE-DUNCAN model and percentage of bioenzyme were fitted based on the triaxial test results. A LADE-DUNCAN elasto-plastic constitutive model based on the percentage of bioenzyme was proposed. The results show that the stress-strain relationships between deviator stress q and axial strain ε1 is strain hardening, deviator stress q and bulk strain εV is shrinkage, and the test curves between ε1, εV and q and ε3 are hyperbola at different ratios of bioenzyme-based soil stabilizer. The behaviors of strain hardening and strain shrinkage of bioenzyme-treated expansive soil can be better described according to modified LADE-DUNCAN yield criterion by bond stress σ0. The stress-strain relationship of bioenzyme-treated expansive soil at different percentages of bioenzyme and confining pressures σ3 can be well predicted based on the proposed stress-strain constitutive equation. © 2021, Central South University Press. All right reserved.

引用

页码：4190 / 4200

页数：10

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