Experiment and analysis on drillability of artificially frozen clay

Specific chiseling work of the frozen clay are conducted at different temperature of -3,-5,-7,-10,-12,-15,-17 and -19℃. The relations between specific chiseling work, chiseling depth and temperature have been regressively formulated. The experiment indicates that the drilling depth will gradually increase with the decrease of temperature. At the same temperature the specific chiseling work quickly increases at the first ten cycles, and the increase becomes slow at the last ten cycles. With the decrease of temperature the frozen soil becomes harder,and the chiseling depth is shallower,i.e. the drilling is more difficult,and the drillability is stronger.