Interface Mechanics of Particulate Media with Ribbed Inclusions
Abstract
A large half-axisymmetric triaxial apparatus for studying the pullout resistance and interface mechanics of cylindrical ribbed inclusions in particulate material (soil) was designed, constructed and tested. The unusual geometry was needed to facilitate visual observation of grain motions, the changing soil fabric and shear band development around the inclusions. Initially, it will provide verification of a previously developed plasticity model for soil-ribbed inclusion interaction. The model is based on the development of passive soil resistance to advancing ribs in a plane strain geometry. The results of these plane strain observations are presented. While the model has been theoretically extended to cylindrical inclusions, experimental verification, including the observation of soil grain behavior in the vicinity of ribs, has hitherto not been conducted. Computer visualization hardware and software for tracking the displacements and rotations of individual particles has been developed. The system includes a computer workstation, a laser video disk recorder and digitizing boards. The software was written at the University of New Mexico and modified for the testing program at the University of Michigan. A CCD video camera and bellows system allow for 1:10 to 5:1 magnifications. Various combinations of opaque dyes and color filters optimize the visual data collection while computer enhancement prepares the data for edge detection and particle tracking. Particulate media, Computer vision, Experimental micromechanics
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 15, 1994
- Accession Number
- ADA283957
Entities
People
- Masyhur Irsyam
- Roman D. Hryciw
- Scott A. Raschke
Organizations
- University of Michigan