【摘要】 含裂隙岩石/类岩石试件在单轴压缩下的破坏特征已有较多研究,但对含X型裂隙试件单轴拉伸下的破坏特征尚无研究结论。对含两组叠置X型裂隙类岩石材料试件进行了单轴拉伸试验,并与对应试件单轴压缩情况的已有实验结果进行了对比,研究了含两组叠置X型裂隙类岩石试件单轴拉伸下的岩桥贯通行为及强度特征。研究结果表明:含两组叠置X型裂隙类岩石材料试件在单轴拉、压作用下的破坏模式及岩桥贯通模式表现不同,在单轴拉伸作用下含两组叠置X型裂隙类岩石试件岩桥处不会出现贯通现象;含两组叠置X型裂隙类岩石材料试件的次裂隙位置影响试件单轴拉伸强度,在主裂隙位置固定情况下,次裂隙角度与最大拉应力方向垂直时试件强度最低,次裂隙角度与最大拉应力方向相同时试件强度最高。更多还原

【Abstract】 Although the failure properties of rock/rock-like specimens with flaws under uniaxial compression have been studied in many cases, those properties of specimens with X-type flaws under uniaxial tension have not been researched yet. In this research the crack coalescence and strength properties were studied with rock-like material specimens containing two overlapped X-type flaws under uniaxial tension tests. The testing results were compared with uniaxial compression results of specimens containing corresponding flaws. The study results show that the failure and coalescence modes of specimens with two overlapped X-type flaws under uniaxial tension tests are different from those with specimens under uniaxial compression tests. There is no crack coalescence at the rock bridge areas of specimens containing two overlapped X-type flaws under uniaxial tension tests. The position of the secondary flaw influences the strength of specimens containing two overlapped X-type flaws under uniaxial tension tests. The specimen with a second flaw vertical to the maximum tension stress has the lowest tension strength among specimens with two overlapped X-type flaws under uniaxial tension tests. The tension strength of the specimen with a second flaw parallel to the maximum tension stress is the highest one among the specimens with two overlapped X-type flaws under uniaxial tension tests.更多还原