关键词: 寒区工程, 冻土, 离心模型试验, 量纲分析

Abstract: Compared with the traditional physical model test, centrifugal test can simulate the long term process of soil freezing with full-scale stress in a short time. However, there are few researches on the centrifuge modeling of cold regions engineering. At present, scaling laws and similarity conditions of thermal dynamics of freezing soil in geotechnical centrifugal modeling are still not completed, which has become an uncertain factor in quantitative analysis of frost heave by centrifugal technique. Based on hydro-thermal-mechanical interaction process in saturated freezing soil, dimensionless variables have been established by Butterfield dimensional analysis method. The scale factors of the pore pressure, thermal diffusion, pore water migration, consolidation of freezing soil in centrifugal modeling have been derived. In centrifugal test, the effect of water migration, thawing soil consolidation and heat diffusion have the unified time factor 1/N2 of the prototype model, and the scale of velocity of unfrozen water is N above the prototype model. In addition, an application of centrifugal modeling of frozen-thawing process about canals has been carried out by cold regions engineering centrifugal modelling facility.

Key words: cold regions engineering, frozen ground, centrifugal modeling test, dimensional analysis