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| Critical state constitutive model of K0 consolidated structural loess |
| HOU Lele1，2，WENG Xiaolin1，2，CUI Yicheng1，2，HAN Weiwei1，2，CHEN Yuxun1，2 |
| (1. Key Laboratory for Special Area Highway Engineering of Ministry of Education，Chang'an University，Xi'an，Shaanxi 710064，China；2. School of Highway，Chang'an University，Xi'an，Shaanxi 710064，China) |
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Abstract Due to structural and initial stress anisotropy，the mechanical and deformation characteristics of undisturbed loess are particularly complex. It is of great significance to study the constitutive relation of undisturbed loess in theory and practical engineering application. Based on the modified Cam-clay model，the structural evolution law of undisturbed loess under water and force conditions was analyzed in this paper. Furthermore，the volumetric change equation of structural loess considering the effects of water and force was proposed，which can reasonably describe the initial anisotropy of undisturbed loess by introducing the concepts of relative stress ratio and relative critical stress ratio. A constitutive model reflecting both structural and initial stress anisotropy of undisturbed loess was derived further by using the correlation flow rule. When the structural and initial stress anisotropy are not considered，the model can be reduced to the modified Cam-clay model. Compared with the triaxial test results and model prediction results of undisturbed loess，the model in this paper can reasonably describe the deformation behavior of undisturbed loess under water and force conditions.
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2022, Vol. 41 
