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| A three-dimensional structural constitutive model of saturated clays related to state variables |
| WAN Zheng1，2，MENG Da1，2，SONG Chenchen3，ZHAO Xiaoguang1，2#br# |
(1. Foundation Engineering Research Institute，China Academy of Building Research，Beijing 100013，China；2. Beijing Foundation and Underground Space Utilization Engineering Technology Research Center，Beijing 100013，China；3. China Construction Infrastructure Co.，Ltd.，Beijing 200092，China) |
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Abstract In view of the characteristics of natural structural saturated clays such as large porosity，high strength and certain cementation，the UH model of over-consolidated soils was expanded into a three-dimensional structural model related to state variables. The left endpoint of the yield surface in the p-q space was shifted to the left of the origin，so that the cementing characteristics of a certain extent of stretching could be considered. The evolution equation of cementing strength parameters was proposed. By introducing a state parameter χ and deducing it’s expression，the yield surface equation was corrected so that the dilatancy equation can describe the strength characteristics of the variable phase stress ratio of the body changing from shear to dilatancy. The concept of structural stress ratio parameter R* was proposed and used to modify the uniform hardening parameter. By using the transformation stress method based on t criterion，a generalized model of stress representation was proposed，which can describe the true triaxial stress-strain relationship. The comparison between test and prediction results shows that the proposed model has strong applicability.
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2020, Vol. 39 
