Abstract
Determining geomechanical characteristics of rocks plays a significant role in all consequent designing stages of geosciences. On the other hand, drilling is one of the considerable operations in primer phases of extracting rocks. Drilling process produces acoustic signals as by-product during drilling. Then, one possible way for predicting geomechanical properties of rocks, is employing acoustic signal frequencies which are produced during drilling operation. This process helps to geoengineers for determining rock characteristics in short time and by low-cost and satisfying precision. This research tries to develop a novel computational relations between geomechanical characteristics of sedimentary rocks and produced dominant acoustic frequencies by implementing Fast Fourier Transform (FFT). For this purpose, a novel rotary drilling machine is developed by researchers. In order to introducing reliable model, 10 diverse sedimentary rock samples from various sedimentary basins of Iran are gathered in wide range of geomechanical features, and all tests are carried out on them. The results of this research could be used for sedimentary basins' characterization. Results show there are reliable mathematical relations between various characteristics of sedimentary rocks (UCS, TS, porosity and hardness) and diverse dominant frequencies.
Highlights
The determination of physical and mechanical properties of rocks is one of the construction engineers’ main concerns in different downstream designations
Drilling experiments are executed on seven different types of travertine with diverse geomechanical features
The sound of the drilling process is recorded for 20 seconds
Summary
The determination of physical and mechanical properties of rocks is one of the construction engineers’ main concerns in different downstream designations. There are several considerable complexities about determining the geomechanical properties of rocks. One of the major problems with this issue is time-consuming, which is not always complete and satisfactorily solved using conventional approaches. The other problem is the cost of this operation, which depends on the project location, regional facilities, the availability of accredited laboratories and so on. Another important factor in defining these features is accuracy, which is entirely dependent on the designing level and type. One major disadvantage of conventional methods for determining geomechanical features is the destructive nature of those tests
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