寒区碾压土多周期冻融循环热水力耦合分析

针对冻融循环条件下工程土体内部发生冰水相变、水分迁移以及温度场变化,进而导致土体变形的问题,提出了冻胀及融沉理论,并建立了基于温度场、水分场以及应力场的耦合方程.通过时域差分法建立三场耦合模型对选定碾压土路基工程实例进行计算.结果表明,计算模型能够准确计算土体温度、水分以及变形情况,并对土体变化进行预测.该模型适用于寒区工程建设中土体多场耦合状态分析,为冻融循环诱发的工程安全问题提供了参考.

Thermo-hydro-mechanical coupling analysis for rolled filled earth in cold region under multicycle of freezing and thawing cycle

In order to solve the soil deformation problem caused by the ice-water phase change, moisture migration and temperature variation occurred inside the engineering soil under the condition of freezing and thawing cycle, the frost heaving and thawing settlement theory was proposed, and the coupling equation based on the temperature field, moisture field and stress field was established. With the time-domain differential method, the coupling model for three fields was established to calculate the engineering examples of highway foundation of selected rolled filled earth. The results show that the proposed calculating model can effectively calculate the soil temperature, moisture and deformation suitations, and can perdict the soil change. The proposed model is suitable for the multi-field coupled state analysis of soil in the engineering construction in the cold region, and can provide a reference for the engineering safety problem caused by the freezing and thawing cycle.