Predicting the Geomechanical Properties of Hard Rocks Using Analysis of the Acoustic and Vibration Signals During the Dr
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ORIGINAL PAPER
Predicting the Geomechanical Properties of Hard Rocks Using Analysis of the Acoustic and Vibration Signals During the Drilling Operation Mehrbod Khoshouei . Raheb Bagherpour
Received: 31 May 2020 / Accepted: 15 October 2020 Ó Springer Nature Switzerland AG 2020
Abstract Evaluating the physical and mechanical properties of materials such as rock or concrete is among the most significant issues in engineering studies. Measurement of the properties of the rocks either in the laboratory or in the field needs the standards and specific methods. Also, most of these tests need time and a large number of rock samples. Therefore, finding a method that can be accurately, quickly, and reliably predict the properties of rocks will provide a great advance in the quality of studies before or during the projects. The purpose of this paper is to find a method for predicting and determining the geomechanical properties of hard rocks during the drilling operation. For this purpose, after the preparation of the rock samples, acoustic and vibration signals propagated during the drilling process were recorded and processed. After analysing the acoustic and vibration signals, statistical analysis for investigation of the relationship between the properties of the rocks and the acoustic parameters was performed. Sound Pressure Level (SPL), First Dominant Frequency (FDF), and Vibration Level (VL) were selected as predictor variables for measuring and predicting Uniaxial Compressive Strength (UCS), Brazilian Tensile strength (BTS) and Schmidt rebound number (SRN) by multivariable regression. Results of M. Khoshouei R. Bagherpour (&) Department of Mining Engineering, Isfahan University of Technology, 8415683111 Isfahan, Iran e-mail: [email protected]
statistical analysis show that there is an acceptable correlation coefficient between rock properties and properties of acoustic and vibration signals of the rock drilling operation. Hence, this method can be used as a relatively inexpensive, non-destructive, reliable and real-time method in large-scale mining or civil operation for predicting the rock properties. Keywords Geomechanical properties Hard rocks Acoustic emission (AE) Rock drilling Acoustic & vibration signals
1 Introduction Determining the physical and mechanical properties of rocks is among the most important issues for mining engineers in various mining operations and forms the backbone of most mining engineering designs. Another issue is the cost or the time of determining the physical and mechanical properties of rocks that depends on the location of the project, the facilities of the area, and the availability of valid laboratories. In general, methods available for measuring rock properties can be categorized into two major groups: direct methods and indirect methods. Direct methods face with plenty of limitations: (1) to achieve the actual results of rock properties, rock samples need to be carefully prepared in standard size and shape, (2) Standa
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