Modified Hyperbolic Model of High Compressibility Clay Considering Strain Strengthening Effects
CHENG Tao and YAN Ke qin
DOI:10.11835/j.issn.1674-4764.2009.05.009
Received May 10, 2009,Revised , Accepted , Available online July 01, 2015
Volume ,2009,Pages 49-53
- Abstract
The elasto plastic constitutive relation of high compressibility clay in Wuhan was investigated. On the basis of the framework of Duncan E~v model, an elasto plastic constitutive model was derived by fitting the data of triaxial compression tests under CTC stress path on isotropic consolidation condition. With the average slope of unload reload curves as unload modulus, the loading unloading function was introduced as the loading unloading criterion. Moreover, the comparison was made among the stress strain relation curve simulated by the proposed model and those with Duncan model and test curve. It was shown that the proposed model was more reasonable, which can reflect the stress strain relation of normally consolidated soils under CTC path. Especially, the model can reflect the strain strengthening effect. The maximum relative error was no more than 5%.