砂岩巴西劈裂疲劳破坏过程中变形与强度特征的试验研究

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Abstract The deformation rules and strength characteristics of sandstone samples in the process of Brazilian split fatigue load were studied by the RMT–150B multi-function servo system. The results showed that there were almost same deformation characteristics in both the conventional split test and uniaxial compression test before the peak load，which could also be divided into 4 stages including compression，elasticity，yielding and failure stage. The destroy mode of Brazilian split fatigue was controlled completely by the fracture process curve of the conventional Brazilian split；and the deformation value and upper limit load(stress) were equivalent to the corresponding deformation in the post-peak process curve of the conventional Brazilian split test. The deformation(rate) curve versus time in the process of splitting fatigue test was similar to the creep characteristics curve，which could be divided into 3 stages including initial acceleration，constant velocity and acceleration stage；and the fatigue limit load(stress) ratio and the tensile fatigue strength were negatively correlated with the cycle number. The fatigue upper limit load(stress) was the main control factor impacting the rock fatigue life；and the internal original microcrack distribution of sandstone sample had great influences on the split fatigue life. The increase of the upper fatigue limit load(stress) leaded to reductions in fatigue life；while the tensile deformation basically unchanged.

Key words： rock mechanics fatigue test Brazilian split tensile strength fatigue life

Received: 12 June 2012

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/I1/41

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