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Modeling the suction- and deviator stress-dependent resilient modulus of unsaturated fine/coarse soil mixture by considering soil–water retention curve
https://orcid.org/http://orcid.org/0000-0001-7539-1518
Experimental observations have shown that the resilient modulus Mr of fine/coarse soil mixture can be significantly affected by the coarse grain content fv, deviator stress σd and suction ψ. In this study, a constitutive model incorporating the soil–water retention curve (SWRC) was proposed to describe the effects of ψ and σd on Mr. This model was then extended to the effect of fv. The proposed model implied the resilient modulus at saturation condition (Mr-sat), the resilient modulus at optimum moisture content (OMC) condition (Mr-opt), the suction at OMC (ψopt) and the parameters related to SWRC. The model was validated using experimental data from five studies reported in the literature. Comparisons with three representative existing models showed that the proposed model was capable to well describe the suction-dependent effect of deviator stress in the full range of suction, while the existing models gave satisfactory simulation results only in the low suction range. Indeed, experimental studies revealed that there was a threshold suction ψth, and with increasing σd, the Mr decreased when ψ<ψth, but increased when ψ>ψth. When ψ<ψth, all models gave good simulations. On the contrary, when ψ>ψth, only the proposed model gave good simulations, in particular when ψth>ψopt. This showed the performance of the proposed model in describing the variation in resilient modulus of unsaturated fine/coarse soil mixtures with changes in coarse grain content, deviator stress and suction.
Modeling the suction- and deviator stress-dependent resilient modulus of unsaturated fine/coarse soil mixture by considering soil–water retention curve
https://orcid.org/http://orcid.org/0000-0001-7539-1518
Experimental observations have shown that the resilient modulus Mr of fine/coarse soil mixture can be significantly affected by the coarse grain content fv, deviator stress σd and suction ψ. In this study, a constitutive model incorporating the soil–water retention curve (SWRC) was proposed to describe the effects of ψ and σd on Mr. This model was then extended to the effect of fv. The proposed model implied the resilient modulus at saturation condition (Mr-sat), the resilient modulus at optimum moisture content (OMC) condition (Mr-opt), the suction at OMC (ψopt) and the parameters related to SWRC. The model was validated using experimental data from five studies reported in the literature. Comparisons with three representative existing models showed that the proposed model was capable to well describe the suction-dependent effect of deviator stress in the full range of suction, while the existing models gave satisfactory simulation results only in the low suction range. Indeed, experimental studies revealed that there was a threshold suction ψth, and with increasing σd, the Mr decreased when ψ<ψth, but increased when ψ>ψth. When ψ<ψth, all models gave good simulations. On the contrary, when ψ>ψth, only the proposed model gave good simulations, in particular when ψth>ψopt. This showed the performance of the proposed model in describing the variation in resilient modulus of unsaturated fine/coarse soil mixtures with changes in coarse grain content, deviator stress and suction.
Modeling the suction- and deviator stress-dependent resilient modulus of unsaturated fine/coarse soil mixture by considering soil–water retention curve
https://orcid.org/http://orcid.org/0000-0001-7539-1518
Experimental observations have shown that the resilient modulus Mr of fine/coarse soil mixture can be significantly affected by the coarse grain content fv, deviator stress σd and suction ψ. In this study, a constitutive model incorporating the soil–water retention curve (SWRC) was proposed to describe the effects of ψ and σd on Mr. This model was then extended to the effect of fv. The proposed model implied the resilient modulus at saturation condition (Mr-sat), the resilient modulus at optimum moisture content (OMC) condition (Mr-opt), the suction at OMC (ψopt) and the parameters related to SWRC. The model was validated using experimental data from five studies reported in the literature. Comparisons with three representative existing models showed that the proposed model was capable to well describe the suction-dependent effect of deviator stress in the full range of suction, while the existing models gave satisfactory simulation results only in the low suction range. Indeed, experimental studies revealed that there was a threshold suction ψth, and with increasing σd, the Mr decreased when ψ<ψth, but increased when ψ>ψth. When ψ<ψth, all models gave good simulations. On the contrary, when ψ>ψth, only the proposed model gave good simulations, in particular when ψth>ψopt. This showed the performance of the proposed model in describing the variation in resilient modulus of unsaturated fine/coarse soil mixtures with changes in coarse grain content, deviator stress and suction.
Modeling the suction- and deviator stress-dependent resilient modulus of unsaturated fine/coarse soil mixture by considering soil–water retention curve
Acta Geotech.
Su, Yu (author) / Cui, Yu-Jun (author) / Dupla, Jean-Claude (author) / Canou, Jean (author)
Acta Geotechnica ; 17 ; 3747-3763
2022-09-01
17 pages
Article (Journal)
Electronic Resource
English
Coarse grain content , Constitutive model , Deviator stress , Resilient modulus , Soil–water retention curve , Suction Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
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