摘要
基于刚性冰模型,应用有限差分法离散方程组,对于饱和颗粒土开放系统的冻结过程进行了一维数值模拟,给出了冻结缘内参数的分布.计算过程中修正了刚性冰模型中分凝冰产生条件,提出以冻结缘内冰压与载荷的关系作为分凝冰产生的判据,计算得到的冻胀量与实验室冻胀实验的测量数据较为吻合.将计算结果与现场实测资料进行了比较,温度场、含水量分布等结果在分布规律方面与现场实测资料相符.
A number of reports indicate that the frost heaving due to water transfer and ice segregation exceeds the original volume of the pore water because of the expansion during freezing. The rigid ice model illustrates in detail the ice segregation and other phenomena in a freezing fringe, i.e. a mixed region of unfrozen water and ice between the warm end of the warmest segregated ice and the freezing front. In this paper, the frozen heaving process is simulated in-free soil, based on saturated, granular, solute the rigid ice model. In the numerical simulation, a criterion is set for the appearance of new ice lens based on the assumption that stress equilibrium should be in accordance with the stress boundary condition. In the criterion, the ice pressure is used instead of the pore pressure. The finite difference method is used and nonlinear algebraic equations are solved by iterative method with hysteretic coefficients. The calculation result is compared with the data from reference. The characteristics revealed from the simulation match well with the experimental data. It is demonstrated that the rigid ice model is effective in simulating the phenomena in frozen fringe during soil freezing process.
出处
《冰川冻土》
CSCD
北大核心
2007年第1期32-38,共7页
Journal of Glaciology and Geocryology
基金
中国科学院知识创新工程重大项目(KZCX1SW06)
国家自然科学基金项目(40501017)资助
关键词
饱和土
冻结
刚性冰模型
数值模拟
saturated soil
freezing process
rigid ice model
numerical simulation
