For noncrushable sand, this paper describes the experimental phenomenon of the opposite turning directions of stress-dilatancy curves between sands before and after cementation. Then, based on the thermomechanical framework and Legendre transformation, the stress-dilatancy model is obtained from the dissipation function. This stress-dilatancy model considers the coupled effect of bond breakage and rearrangement energy. This model also incorporates the mechanism that cementation-improved strength leads to the opposite turns of sands before and after cementation. Compared with the other four existing stress-dilatancy models, this paper's model can depict the opposite turning directions of stress-dilatancy curves between uncemented and cemented sands. This stress-dilatancy model is also verified through five types of cementation: colloidal-silica-cemented sand, (CaCl2+Na2SiO3) cemented sand, naturally bonded sand, microbially induced carbonate precipitation (MICP)-cemented sand, and portland cement-treated sand. The broader application of the model is that it can also be used for crushable sand with particle breakage, as well as artificially cemented sand after freeze-thaw damage.
来源平台：JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
