Abstracts Category : Other

Drilling process monitoring for mechanical properties ofartificial geo-materials and in ground investigation

by Ruiqiu Ma

Drilling Process Monitoring (DPM) technique hasbeen developed and investigated at HKU for more than ten years,which can continuously measure and record the full drilling processin real time series while the hole is being drilled. It has beenapplied to the ground investigation, weathered rockscharacterization, slope upgrading, SPT test and so forth. DPMtechnique includes transducer system and data acquisition system.This technique can be mounted on many types of drilling machines.In drilling process, the drilling bit contacts the drillingmaterial directly, which means the drilling process has a closerelation with mechanical properties of drilling material. So thedrilling process can be considered as an in-situ test of rockmechanical properties. The major obstacle is that it is not easy tograsp the basic mechanic properties of natural materials. As thephysical and mechanical properties of concrete are similar to thoseof intact rock, it is a suitable material for the purpose of thisstudy and is henceforth termed as artificial geo-materials.Therefore, the main aim of the first part of this study was toinvestigate the specific relationships between the drillingparameters and mechanical parameters of artificial geo-materials inthe drilling process. The second part of this study introduced DPMmethod in the ground investigation in Tongchuan. The main objectiveof in-situ DPM tests is to use DPM method to characterize rockstratum along the borehole. Furthermore, from the in-situ DPMtests, the data interpretation criteria have been improved. Thedetailed elaboration of putting steel wires operation has beensummarized, which is the distinctive operation. The detailedcomparisons between DPM results and other investigation methodsresults have been made. published_or_final_version Civil Engineering Master Master of Philosophy