Study on Mechanical Behavior and Boundary Surface Constitutive Model of Loess under Dry–Wet–Freeze–Thaw Cycles.
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| Title: | Study on Mechanical Behavior and Boundary Surface Constitutive Model of Loess under Dry–Wet–Freeze–Thaw Cycles. |
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| Authors: | Ding, Xusheng1 (AUTHOR), Zhang, Lingkai2 (AUTHOR) xjauzhanglk@163.com, Fan, Peipei3 (AUTHOR) |
| Source: | International Journal of Geomechanics. Jun2026, Vol. 26 Issue 6, p1-14. 14p. |
| Subject Terms: | *Loess, *Elastoplasticity, *Strains & stresses (Mechanics), *Shear testing of soils, *Soil mechanics |
| Abstract: | A water conveyance open channel project in Xinjiang passes through a vast region of collapsible loess. Under intermittent water supply conditions and the environmental effect of seasonal temperature variations, the sliding failure of the canal slope often occurs. To analyze the influence of environmental effects on collapsible loess, this study examines the variation law of mechanical properties through triaxial tests subjected to dry–wet–freeze–thaw cycles. An elastoplastic constitutive model suitable for structural loess is proposed based on the modified Cam-clay model. The results indicate that as the number of dry–wet–freeze–thaw cycles increases, the stress–strain curve of loess decreases, while the volume change curve rises, with a progressively smaller range of variation. The cohesion and internal friction angle show an exponentially decreasing trend, greatly affecting cohesion by the dry–wet–freeze–thaw cycle. Three failure modes are observed in loess soil samples. The stress–strain curve corresponding to shear failure exhibits a softening type, the curve for bulging failure shows a weak hardening type, and the curve belonging to compaction failure demonstrates a strong hardening type. Based on the modified Cam-clay model, the concept of upper and lower loading surfaces is introduced to account for the structure of loess, and a nonassociated flow criterion is used to develop a boundary surface elastoplastic constitutive model suitable for loess. The fitting results are in good agreement with triaxial test data obtained under dry–wet–freeze–thaw cycles. These findings provide theoretical support for the safe operation of open channels. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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