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Complex behaviour of a coal sample in a large scalein situ compression test
Authors:Tadeusz Cyrul
Institution:(1) Mining Engineering Department, University of Kentucky, 40506-0046 Lexington, Kentucky, USA;(2) Present address: Strata Mechanics Research Institute, Polish Academy of Sciences, Reymonta 27, 30-059 Krakow, Poland
Abstract:Summary A large scalein situ compression test of a laminated coal cube is described. The cube was uniformly loaded by a system of hydraulic jacks supplied simultaneously from one pump. At the same time both load and deformations were controlled. Deformations were measured by 60 longitudinal gauges located at the side surface of the cube in the regular net. Due to the heterogeneity of the rock the readings showed scatter. As a first approximation, the scattered data were fitted to the plane using the least square method. Orientations of the planes were analysed and show permanent relative movement between adjacent lamina indicating complex behaviour of the cube under loading. Detailed analysis of this behaviour indicated that the cube was subjected to both bending and twisting.
Keywords:Rock testing  coal cube strength  rock mechanics  in situ strength test  coal pillars
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