Experiment Study of the Soft Rock Materials Based on Rotary Penetration Test

Abstract

Based on the new-style rotary penetration instrument, the rotating-incising-drilling experiment for the hard rock material are tested in this paper. The conclusion is that rotary penetration test can more effectively improve the drilling capacity than cone penetration test using in hard layer such as soft rock、hard loess and so on, and reduce bit pressure without improving the capability of instruments based on the factor that using rotary drilling instead of direct drilling. Further analyses have shown that the qualitative relationships between rotary penetration test data and basic mechanical parameters can be preliminarily obtained.The results establish a foundation for further study of rotary penetration technique using in hard layer.