NIOSHTIC-2 Publications Search
Analysis of Pillar Punching Into Soft Claystone in Southern Illinois.
Key Questions in Rock Mechanics: Proceedings of the 29th U S Symp Balkema PP 59-67 :59-67
Subsidence can be caused by mine level failures in the roof, pillars, or floor which allow displacements that propagate to the surface. However, in Illinois, plastic failure of weak claystone floor dominates the failure process. The objective of the research by the U.S. Bureau of Mines is to define the failure mechanisms and resultant upper bounds to the limit loads given by the limit analysis method for both square and rectangular pillars punching into plastically behaving floor of both finite and infinite thickness. This paper describes the assumptions, techniques, and preliminary results of a laboratory program designed to define the three-dimensional failure mechanisms in an infinitely thick, frictionless, perfectly plastic material beneath a square punch.
Key Questions in Rock Mechanics: Proceedings of the 29th U.S. Symp., Balkema, PP. 59-67
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division