A new type of stress piezometer

RS stress gage

is presented in this paper. This new type of stress gage make use of piezoelectricity of piezocrystal to measure dynamic stress and read the magnitude directly. To avoid the bad matching of the gage and rock mass in situ

the shell of the gage is made of rock core from in situ. It has been proved that the new stress gage can work well during the measuring of the stress of blast wave in rock mass as long as it was made fine

calibrated accurately

and inserted carefully.