Rock thermal fracturing is affected not only by rockcharacter and structure, but also by heating mode and velocity.
岩石受热破裂不仅受到自身性质和结构的影响，还受到加热方式和加热速度的影响。
2
Some basic blasting parameters are given by calculating and the process is introduced on the discussion of pre-crack explosion of different rockcharacter.
The test result shows the penetration rate of the bit is closely related to the transmission ratio, cutter teeth structure, rockcharacter and drilling parameters.