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鉴于冻土中冰的胶结作用在冻土力学性质方面的重要作用,在三维离散元法中,采用黏结发生在有限范围内的模型来考虑冰的胶结作用,对不同围压下冻结黄土的胶结行为进行了数值研究。结果表明:数值模拟的应力-应变曲线与试验数据吻和较好;颗粒接触刚度、平行黏结刚度和强度均随着围压增大而线性增大,但摩擦系数随围压增大而减小;力链、位移和孔隙率与围压的响应关系呈现出统一性。同时,也分析了冰胶结作用影响下的冻土细观变化与宏观力学行为之间的响应关系。这对于促进离散元法在冻土领域内的应用具有积极的作用。
In view of the important role of icing in the frozen soil on the mechanical properties of frozen soils, three-dimensional discrete element method is used to consider the effect of the cementation of ice on the frozen cemented soil under different confining pressure Conducted a numerical study. The results show that the stress-strain curves of the numerical simulation are in good agreement with the experimental data. The contact stiffness and the parallel bond stiffness and strength increase linearly with the increase of confining pressure, but the friction coefficient decreases with the increase of confining pressure ; The response of force chain, displacement and porosity to confining pressure showed unity. At the same time, the relationship between the mesoscopic changes of the permafrost and macroscopic mechanical behavior under the influence of the ice cementation was also analyzed. This has a positive effect on promoting the application of discrete element method in the field of frozen soil.