Modelling and numerical analysis of moisture, heat and stress in seasonal frozen soil

作者：Li Dong Qing^*; Zhou Jia Zuo; Zhang Kun; Chang Fa

来源：China Journal of Highway and Transport, 2012, 25(1): 1-7.

• Calculated values
• Coupling problem
• Creep deformations
• Discretizations
• Finite element equations
• Highway sections
• Nonlinear differential equation
• Numerical solution
• Road engineering
• Time domain
• Unsteady temperature field

In order to prevent the road diseases resulted by the interaction of moisture, heat and stress in seasonal frozen soil areas, the problem of coupled moisture, heat and stress in seasonal frozen soil was studied. According to the characteristics of seasonal frozen soil, mainly considering variation of the matrix potential and pressure potential with temperature, a model of coupled moisture, heat and stress in seasonal frozen soil was presented. The coupling problem was solved by solving a nonlinear differential equation of unsteady temperature field. Water content, stress and creep deformation could be calculated once the temperature field was determined. The numerical solution for the equation which included the establishment of finite element equations, discretization of the time domain and the iterative method was derived. The numerical simulation of the embankment of National Highway G109 near Xiangpi Mountain was carried out. The comparison of calculated value and measured value was made. The results show that the temperature, water content and predicted deformation of pavement in the highway section with grit cushion strengthened by cement are lower than that in the section with grit cushion unstrengthened by cement.

• 出版日期2012