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中文摘要：
使用颗粒流（PFC）虚拟实现不同中心角的平台圆盘巴西劈裂和直接拉伸试验,观察平台圆盘巴西劈裂中裂纹形成、扩展的一般过程,分析不同中心角对岩石破坏过程及破坏模式的影响。研究结果表明：平台中心角越大,岩石内损伤破坏程度越高,破坏模式变得更复杂。通过对不同平台中心角的圆盘试样断裂模式的观察和分析,并结合已有的研究成果推荐平台中心角为20°;利用直接拉伸数值试验的拉伸强度,计算出平台中心角为20°时的抗拉强度修正系数k=0.931 5。
英文摘要：
A set of Brazil split tests of the flattened disk varied with central angles and the direct tension test were simulated by particle flow code （PFC）. The common failure process in the rock specimen was found and the impact of different central angles of fiats on rock specimens＇ failure modes was analyzed. The result shows that as the central angle of fiats increases, heavier damage degree is expested in the rock specimens and the failure mode becomes more complex. Based on the observation and analyses of rock specimens＇ failure modes of different central angles, together with existed research results, central angle of fiats is recommended to be 20°. When the central angle is 20°, tensile strength corrective factor, k=0.931 5, which is calculated with tensile strengths of direct tension test and Brazil split test of flattened disk.
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