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| VARIATION OF DISPLACEMENT FIELD AND DAMAGE EVOLUTION OF ROCK WITH HORIZONTAL JOINT UNDER WEDGE INDENTER |
(State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，
Chinese Academy of Sciences，Wuhan，Hubei 430071，China) |
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Abstract In order to study the influence of horizontal joint on the rock fragmentation when disc cutter penetrate rock，the wedge indentation penetration experiments of similar material are carried out under simplified actual conditions using improved experimental device. The digital image of the deformation and failure process of specimen surface are obtained in real-time by using charge coupled device(CCD) camera. Digital speckle correlation method is used to analyze the collected images and the displacement field of the specimen surface. The damage of specimen under concentrated load by wedge indenter is expressed by the variance of the displacement field. Acoustic emission testing system digital signal processing(DISP) is applied to get the localization of micro-fracture failure on specimen surface，and analyze the formation mechanism and the characteristics of acoustic emission(AE) concentrated in space when the specimen with horizontal joint.
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Received: 13 January 2011
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2011, Vol. 30 
