Prediction of Mechanical Properties of Sedimentary Type Rocks Using Rotary Drilling Parameters
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ORIGINAL PAPER
Prediction of Mechanical Properties of Sedimentary Type Rocks Using Rotary Drilling Parameters C. R. Lakshminarayana
. Anup K. Tripathi . Samir K. Pal
Received: 5 February 2020 / Accepted: 27 April 2020 Springer Nature Switzerland AG 2020
Abstract The estimation of strength properties of sedimentary rocks is most often needed during the preliminary phase of many rock engineering projects carrying out in sedimentary regions. The main drawback of determining the rock properties in a test center is the requirement of the number of superior quality rock core specimens. In this experimental investigation, the uniaxial compressive strength (UCS) and tensile strength of sedimentary rocks are estimating using well-identified drilling variables and acoustic parameters obtained during the rotary type rock drilling. The drilling variables such as thrust, torque, and vibration parameters are used to develop the mathematical models of strength properties of rock. A drill type dynamometer was used to measure the drilling variables, and the vibration parameter would measure using the NI-9234 data acquisition system. The prediction efficiency of the mathematical model is evaluating using performance indices. Results show that the used experimental method can estimate the considered responses (UCS and tensile strength) with the acceptable percentage errors of 10.52% and 11.27% respectively, and may be useful to measure C. R. Lakshminarayana (&) A. K. Tripathi Department of Mining Engineering, N.I.T.K, Surathkal, Karnataka 575025, India e-mail: [email protected] S. K. Pal Department of Mining Engineering, IIT, Kharagpur, West Bengal 721302, India
the UCS and BTS of sedimentary rocks in a laboratory capacity without test core samples. Keywords Strength properties Drilling dynamometer Thrust Torque Regression model Prediction performance
1 Introduction The physico-mechanical properties of rocks are the important parameters to be measured often in many engineering projects such as mining, petroleum, civil, etc. The preparation of the specimens required for measurement of uniaxial compressive strength (UCS) of rocks at the concerned laboratory is a tedious, timeconsuming and expensive process (Alber and Kahraman 2009; Nazir et al. 2013; Kabilan and Muttharam 2016; Kumar et al. 2011a, b, 2013; Ceryan et al. 2012). As per the international standards of rock mechanics (ISRM), at least three test core specimens, each having the minimum diameter of 54 mm and height of 135 mm with both ends grounded and polished to a precise accuracy, is the essential requirement to determine the UCS of rock in rock mechanics laboratory. The final UCS of a rock would take as the average UCS of all three test specimens. In addition, the extraction of rock cores used for laboratory testing is not always possible from the weak or
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Geotech Geol Eng
thinly bedded, or weathered and highly fractured rocks. Therefore, the rock properties may not measure in detail, and their pro
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