Abstract
AbstractUnder dynamic load, the porosity of unsaturated soil will change correspondingly, affecting the research accuracy of soil. Therefore, a dynamic response model of unsaturated soil considering dynamic porosity is established based on mixture theory to reveal the dynamic characteristics of unsaturated soils fully. The Comsol Multiphysics PDE is used to analyze the porosity change and dynamic response characteristics of two-dimensional unsaturated soil under vertical harmonic load. The numerical results show that the difference in the upper boundary is an essential factor affecting the dynamic characteristics of the subgrade. Compared with the upper boundary impervious to water and air, the pressure of the liquid and gas phases is zero, and the change of porosity and vertical displacement is more prominent. When considering the dynamic porosity, the porosity decreases under the load, and the resistance becomes more prominent when the soil skeleton is compressed, so the vertical displacement decreases, resulting in a corresponding decrease in liquid and gas phase pressure.
Publisher
Springer Nature Singapore