Cutting Force Component Ratios in the Scope of Material Differenciation During Mechanical Excavation of Rock on the Example of Concrete

Published: 29-03-2020| Version 2 | DOI: 10.17632/mynywmvmm6.2
Contributor:
Bruno Grafe

Description

The dataset is related to linear rock cutting experiments on concrete samples that consisted of different concrete mixtures. It is a supplement to scoping study using a procedural evaluation routine to analyse cutting Force Component Ratios (FCR) that could be used for the identification of changing mechanical rock properties during mechanical excavation. It focuses on the use of FCR in conjunction with point attack picks. The cutting depth and the spacing-to-depth ratio were varied at three levels each. 6, 8 and 12 mm for cutting depth (Coded as DZ in Dataset), the spacing ration at levels of 2, 3 and 4. In the dataset, the resulting spacing is stored as DY. Two artificial rock samples were tested. The samples were composed of two respective three different zones of concrete. The first block’s zones had a nominal cubic Uniaxial Compressive Strength (UCS) of 85 MPa (Zone 3) and 45 MPa (Zone 2). The zones of the second block were 85 (Zone 3), 45 (Zone 2) and 25 MPa (Zone 1). For each combination of cutting parameters, a whole layer of a specimen was cut in such a way that each cut groove crossed the different zones. In total, 414 single cuts were conducted to achieve reliable results. A procedural evaluation process was developed to assess the potential of Force Compononent Ratios for material differenciation based on statistical descriptors. The descriptors used where: arithmetic mean, geometric mean, median, interquartile range, 0.95-quantile, variance coefficient. A classification algorithm implemented in R was utilized to classify all combinations of statistical descriptors and Force Component Ratio. In total 72, combinations of Force Component Ratio and statistical descriptor were classified, 9 combinations were classified as suitable, 10 as partially suitable and the rest as unsuitable. The results imply that an FCR material differenciation based an raw cutting force measurements could be a tool for material diferenciation during mechanical excavation

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Steps to reproduce

The raw data derive from the linear rock cutting test rig HXS 1000-50 of TU Bergakademie Freiberg. The cutting speed was 0.1 m/s. The cuts where arranged side by side. A piezo-force measurement sandwich module was used to measure the x, y and z-component of the cutting forces with a frequency of 1000 Hz. The value of Fres was calculated in real time during data acquisition in the Dewesoft X2 Software that was also used for data acquisition. The raw data where then organized according to their cutting parameters in a database using the Flexpro software. The files then where summarized into txt-files as accessible in this database. For the final evaluation, the R-scripts where used as they can be found in the respective folders. The R-Scripts where written by Bruno Grafe.