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State-Dependent Dilatancy of Soils: Experimental Evidence and Constitutive Modeling
Abstract This work provides a new evaluation method of the dilatancy for cohesive soils from monotonic and cyclic undrained triaxial tests. Herein it is implemented for experiments performed on Kaolin. Leastwise for this soft soil the dilatancy turns out to be a function of the stress ratio $$\eta $$ and the void ratio e along with the intrinsic material parameters. Furthermore, an OCR-definition, which includes the influence of both the stress ratio and void ratio such that $$d = f(\mathrm{OCR},C)$$ with C being a set of inherent parameters is proposed. In addition based on the experimental observations it is suggested that there is an overconsolidation ratio $$\text {OCR}_{ci}$$ at which the soft soil behaviour changes from contractant in case of $$\text {OCR}<\text {OCR}_{ci}$$ to dilatant (the material can both contract and dilate depending on $$\eta $$ ) in case of $$\text {OCR}>\text {OCR}_{ci}$$ with the PTL lying below the CSL in this case. Finally, a constitutive relation describing the behaviour of soft soils including the dilatancy and viscosity is proposed. Some simulations of monotonic as well as cyclic tests are shown to prove the accurate performance of the model.
State-Dependent Dilatancy of Soils: Experimental Evidence and Constitutive Modeling
Abstract This work provides a new evaluation method of the dilatancy for cohesive soils from monotonic and cyclic undrained triaxial tests. Herein it is implemented for experiments performed on Kaolin. Leastwise for this soft soil the dilatancy turns out to be a function of the stress ratio $$\eta $$ and the void ratio e along with the intrinsic material parameters. Furthermore, an OCR-definition, which includes the influence of both the stress ratio and void ratio such that $$d = f(\mathrm{OCR},C)$$ with C being a set of inherent parameters is proposed. In addition based on the experimental observations it is suggested that there is an overconsolidation ratio $$\text {OCR}_{ci}$$ at which the soft soil behaviour changes from contractant in case of $$\text {OCR}<\text {OCR}_{ci}$$ to dilatant (the material can both contract and dilate depending on $$\eta $$ ) in case of $$\text {OCR}>\text {OCR}_{ci}$$ with the PTL lying below the CSL in this case. Finally, a constitutive relation describing the behaviour of soft soils including the dilatancy and viscosity is proposed. Some simulations of monotonic as well as cyclic tests are shown to prove the accurate performance of the model.
State-Dependent Dilatancy of Soils: Experimental Evidence and Constitutive Modeling
Tafili, Merita (author) / Triantafyllidis, Theodoros (author)
2019-08-21
31 pages
Article/Chapter (Book)
Electronic Resource
English
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