A binary-medium-based constitutive model for porous rocks

Chen, Yanbin; Liu, Enlong; Yu, Yanyang; Luo, Huiwu; Chen, Peishuai

doi:10.1016/j.ijrmms.2023.105345

Cited by 6 publications

(1 citation statement)

References 65 publications

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“…The theory abstracts structural geotechnical materials into a binary medium consisting of firmly cemented structural bodies and weakly cemented zones [22]; both bear the load together, and the structure gradually breaks down and transforms into a soft zone in the process of soil deformation. At present, many scholars have successfully applied the binary medium model to a variety of geotechnical materials, including rockfill [23], rock [24][25][26], fissure loess [27][28][29][30][31][32], structural soil [33], tailings [34], etc. The binary medium model can better simulate the deformation characteristics of the above geotechnical materials.…”

Section: Introductionmentioning

confidence: 99%

A Binary Medium Constitutive Model for Frozen Solidified Saline Soil in Cold Regions and Its Fractal Characteristics Analysis

Kang,

Li,

Zhang

et al. 2024

Fractal Fract

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In addressing the issue of strength degradation in saline soil foundations under the salt-freeze coupling effects, a binary medium constitutive model suitable for un-solidified and solidified frozen saline soil is proposed considering both bonding and friction effects. To verify the validity of the constitutive model, freezing triaxial tests are carried out under different negative temperatures, confining pressures, and water contents. The pore structure and fractal characteristics of saline soil are analyzed using mercury intrusion porosimetry (MIP) and the fractal dimension D qualitatively and quantitatively, which shed light on the strength enhancement mechanism during the solidification of frozen saline soils. The results show that the constitutive model for frozen solidified saline soil based on binary medium theory aptly captures the stress–strain relationship before and after the solidification of frozen saline soil. The stress–strain relationship of frozen saline soil before and after solidification can be delineated into linear elasticity, elastoplasticity, and strain-hardening or -softening phases. Each of these phases can be coherently interpreted through the binary medium constitutive model. The un-solidified and solidified frozen both show pronounced fractal characteristics in fractal analysis. Notably, the fractal dimension D of the solidified saline soil exhibits a significant increase compared to that of un-solidified ones. In Regions I and III, the values of D for solidified saline soil are lower than those for untreated saline soil, which is attributed to the filling effect of hydration products and un-hydrated solidifying agent particles. In Region II, the fractal dimensions DMII and DNII of the solidified saline soil exhibit a “non-physical state”, which is mainly caused by the formation of a significant number of inkpot-type pores due to the binding of soil particles by hydration products.

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