Theoretical Study on Freezing Separation Pressure of Clay Particles with Surface Charge Action

This study aimed to clarify the mechanism of effect surface charge clay particles on separation pressure between adjacent frozen particles. A general mathematical model spherical was given based extended colloidal stability (DLVO) theory; it introduced into frost heave process, and functional expression freezing temperature derived by using relationship pore throat’s radius temperature, which verified existing experimental results. Finally, effects mineral species solution concentration ice-lens growth were analyzed. Our results show that distance charged bodies is a single-valued function their pressure, but main factor affecting particles; proportional its surface-charge density. For same particle spacing, pressures kaolinite illite are not much different, they both about one order magnitude lower than montmorillonite; negatively correlated with concentration. When less 0.1 mol·m?3, negligible. The research can provide theoretical reference for improving geotechnical theory.