用SCDC试样测试岩石动态断裂韧度的新方法

doi:10.13722/j.cnki.jrme.2015.02.007

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Abstract The large size(150 mm×80 mm) and single cleavage drilled compression(SCDC) specimens were impacted by the large-diameter(?100 mm) split Hopkinson pressure bar(SHPB)，and the dynamic toughness of fracture initiation and propagation of sandstone were determined using the experimental-numerical-analytical method. The time of crack initiation and the speed of crack propagating were sequentially measured with the crack propagation gauge(CPG) glued near the crack tip of the specimen，which were proved to be more accurate and sensitive than the ordinary strain gauges on the corresponding position for the same specimen. The experimental-numerical-analytical method considered the effect of inertia and the speed of crack propagation on the dynamic stress intensity factor with the finite element calculation and the semi-analytical modification for the determination of dynamic fracture toughness of rock and was more suitable than the quasi-static method. Both the dynamic toughness of crack initiation under the different dynamic loading rates and the dynamic toughness of crack propagation with different cracking speeds obtained with the experiment-numerical-analytical method were increased with the increasing of dynamic loading rate and cracking speed respectively. Finally，the possibility of achieving crack arrest using SCDC was discussed through analysis of cracking time of the strain gauges positioned on the path of crack propagation.

Key words： rock mechanics single cleavage drilled compression(SCDC) dynamic initiation toughness dynamic propagation toughness experimental- numerical-analytical method crack propagation gauge universal function

Received: 28 April 2014

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.02.007 OR http://www.rockmech.org/EN/Y2015/V34/I02/279

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