1. Influence of the Undercut Anchor Head Angle on the Propagation of the Failure Zone of the Rock Medium
- Author
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Józef Jonak, Robert Karpiński, and Andrzej Wójcik
- Subjects
Technology ,breakout failure ,undercut anchors ,Context (language use) ,cone failure ,02 engineering and technology ,Article ,0203 mechanical engineering ,Perpendicular ,General Materials Science ,Geotechnical engineering ,Rock mass classification ,Microscopy ,QC120-168.85 ,FEM ,Plane (geometry) ,QH201-278.5 ,Fracture mechanics ,Engineering (General). Civil engineering (General) ,021001 nanoscience & nanotechnology ,TK1-9971 ,020303 mechanical engineering & transports ,Descriptive and experimental mechanics ,post-installed anchors ,Fracture (geology) ,Head (vessel) ,Undercut ,Electrical engineering. Electronics. Nuclear engineering ,TA1-2040 ,0210 nano-technology ,Geology - Abstract
The paper presents the results of a numerical analysis (FEM) describing the effect of the undercutting head angle on the formation of the rock mass failure zone during the initial stages of failure propagation. The research was carried out in the context of developing a technology for rock extraction by controlled pull-out of undercut anchors installed in the rock mass. The focus was on the initial stage of crack propagation and its trajectory for anchors embedded at an assumed constant depth and a value of the friction coefficient of the rock against the anchor head. It is shown that smaller angles favor smaller stripping angles and an increased radial impact of the head on the rock material (in the plane perpendicular to the head axis), while the impact of heads with larger angles is found to favor larger fracture penetration angles and faster penetration towards the free rock surface.
- Published
- 2021