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- W2740729497 abstract "The Rotary Percussion Sounding System (RPSS) was developed as an innovative approach to in situ rock mass characterization. It is based on a crawler-mounted rotary percussion drill rig, with modifications to provide digital records of relevant drilling parameters. In essence, the system uses modern instrumentation and computer technology to quantify the readily observable phenomenon that drilling speed decreases as rock strength increases. Empirical correlations have been derived to provide quantitative estimates of rock properties from the measured drilling parameters. The system includes direct measurements of drill head vertical position, hydraulic pressure input to the percussion hammer, blow rate of the percussion hammer, downward force on the bit, hydraulic pressure input to the bit rotation motor, rotation speed, and drilling fluid flow rate. This paper presents descriptions of the drill rig, as well as the special-purpose instrumentation and data acquisition systems that were developed for rotary percussion sounding. Data recording and reduction approaches appropriate to rotary percussion sounding are described. The primary focus of this paper is the development of an analysis methodology based on drilling inputs and the resulting drill advance rate that produces an empirically defined metric, the Percussion Index (λp), which is independent of drilling inputs and can be correlated to rock strength. The analysis methodology was developed from a dataset derived by drilling in specially prepared concrete test articles having unconfined compressive strengths ranging from approximately 3 to 100 MPa (400 to 15,000 psi), and from measurements of the stress pulse amplitude made on strain-gaged drill rods." @default.
- W2740729497 created "2017-08-08" @default.
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- W2740729497 date "2005-01-01" @default.
- W2740729497 modified "2023-09-27" @default.
- W2740729497 title "Rotary Percussion Sounding System for In Situ Rock Mass Characterization" @default.
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- W2740729497 hasPublicationYear "2005" @default.
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