Automatic drilling process monitoring (DPM) for in-situ characterization of weak rock mass strength with depth

Abstract

This paper introduces a new in-situ technique for characterizing rock mass mechanical strength and the associated spatial distribution in the ground. The technique involves automatic drilling process monitoring (DPM). Case examples are given to show the original DPM data and analyzed results in a weathered rock mass. The drilling machines in the examples are pneumatic rotary-percussive drilling machines with down-the-hole hammers. The DPM data can directly show the in-situ rock mass drilling resistance strengths and their spatial distribution along the drillhole in the ground. The DPM is a simple, reliable and practical tool for furthering the practice and knowledge of rock mechanics and engineering in the underground environments comprising weathered soils and rocks. © 2007 Taylor & Francis Group.