Experimental Investigation on Frost Heaving Force (FHF) Evolution in Preflawed Rocks Exposed to Cyclic Freeze-Thaw Conditions

This work is aimed at investigating the structural deterioration and frost heaving force evolution characteristics of flawed rocks using a self-developed (FHF) measurement system. Three kinds preflawed with different flaw geometry parameters were used to conduct FHF tests. The testing results reveal five distinguished stages from curve; they are inoculation stage, explosive decline steady recovery sudden drop stage. In addition, secondary phenomenon found, peak value lower than initial value. Moreover, decreases increasing F-T cycle number, its decreasing rate becomes faster high cycle. affected not only by but also lithology. For low-pore hard rock, damage propagates quickly after occurrence freeze-thaw damage. It suggested that mesoscopic structure rock affects water migration water-ice phase transformation, can be fractured in preexisting flaws.