1. Analyses and predictions of rock cuttabilities under different confining stresses and rock properties based on rock indentation tests by conical pick
- Author
-
Li Xibing, Shaofeng Wang, Yu Tang, and Kun Du
- Subjects
010302 applied physics ,Metals and Alloys ,02 engineering and technology ,Conical surface ,021001 nanoscience & nanotechnology ,Geotechnical Engineering and Engineering Geology ,Condensed Matter Physics ,01 natural sciences ,Rock cutting ,Stress (mechanics) ,Compressive strength ,Indentation ,0103 physical sciences ,Ultimate tensile strength ,Materials Chemistry ,Roadheader ,Geotechnical engineering ,Stress conditions ,0210 nano-technology ,Geology - Abstract
The rock indentation tests by a conical pick were conducted to investigate the rock cuttability correlated to confining stress conditions and rock strength. Based on the test results, the regression analyses, support vector machine (SVM) and generalized regression neural network (GRNN) were used to find the relationship among rock cuttability, uniaxial confining stress applied to rock, uniaxial compressive strength (UCS) and tensile strength of rock material. It was found that the regression and SVM-based models can accurately reflect the variation law of rock cuttability, which presented decreases followed by increases with the increase in uniaxial confining stress and the negative correlation to UCS and tensile strength of rock material. Based on prediction models for revealing the optimal stress condition and determining the cutting parameters, the axial boom roadheader with many conical picks mounted was satisfactorily utilized to perform rock cutting in hard phosphate rock around pillar.
- Published
- 2021