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| Stress-strain characteristics of bioenzyme-treated expansive soil based on SHEN Zhujiang?s elasto-plastic model with double yield surfaces |
| WEN Changping1，2，WANG Jiejun1，2 |
| (1. Hunan Engineering Laboratory for Manufacturing and Application Technology of Modern Timber Structural Engineering Materials，Central South University of Forestry and Technology，Changsha，Hunan 410018，China；2. School of Civil Engineering，Central South University of Forestry and Technology，Changsha，Hunan 410018，China) |
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Abstract A modified Shen Zhujiang?s elasto-plastic model with double yield surfaces(Shen?s model) in terms of the ratio of bioenzyme-based soil stabilizer was presented for the double yield surfaces elasto-plastic constitutive relation of the bioenzyme-treated expansive soil. The triaxial consolidated-drained shear tests of remolded expansive soil samples with the different ratios of bioenzyme-based soil stabilizer were conducted and the stress-strain relationship of bioenzyme-treated expansive soil was studied. The mechanism of the ratio of bioenzyme-based soil stabilizer affecting the relevant parameters in Shen?s model was analyzed using the parameter analysis method of Duncan-Chang model. The correlation expressions between the parameters of Shen?s model and the ratio of bioenzyme-based soil stabilizer were put forward and a modified method of tangent volume ratio ut based on the hyperbola relationship of - curve was presented. The physical meaning of the parameters of the modified Shen?s model is well defined，and the test methods for determining the parameters of the modified Shen?s model are the same as that of the Shen?s model. The comparison between the experimental curves and the modified Shen?s model curves of - and q- respectively shows that the modified Shen?s model describes reasonably the elasto-plastic stress-strain characteristics of expansive soil under the different ratios of bioenzyme- based soil stabilizer，and reflects the mechanism of the ratio of bioenzyme-based soil stabilizer in influencing the elasto-plastic stress-strain relationship.
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2018, Vol. 37 
