Study on the Freeze-Thaw Damage of Granite Under Impact Loading

Abstract

The freeze-thaw damage of granite was studied used SHPB tests and numerical simulation in the paper. All the granite samples were taken from high altitude localities in Tibet, China, which were made impact loading test after freeze-thaw cycles. The strain rate was unified in the use of SHPB tests combined with numerical simulation to analyze the relationship between dynamic strength and freeze-thaw cycles. The results shows, under different freeze-thaw cycles, the shapes of the reflected and transmitted waves before and after freeze-thaw are different, mainly reflected in the great difference of the curves before and after the peak. With the increase of the freeze-thaw cycles, the peak value of the strength curves decrease apparently and the peak stress decreases apparently after 10 cycles. Samples have different strain rates with the same incident wave under different freeze-thaw cycles. The dynamic strength of granite is associated with the strain rate and the freeze-thaw cycles. Study on the freeze-thaw damage of granite under impact loading is the basis of the granite dynamic constitutive relation and it is important to analyze the stability of open-pit mine slope in seasonal frozen regions.