不同裂纹倾角下岩桥拉张破裂数值模拟研究

Numerical simulation on tensile fracture process of rock bridge with different crack angles

以预制于岩体中不同倾角的裂纹及其组成的岩桥为研究对象,采用可模拟拉张开裂的有限元软件,对不同裂纹倾角岩桥模型的拉张破坏过程进行数值模拟。结果显示:在单轴压缩条件下,对于相同尺寸、等距离的平行预制裂纹,裂纹的倾角不同,拉张裂纹的扩展形态不同;预制裂纹倾角越大,岩桥越容易拉张破坏;八字形裂纹比平行裂纹更稳定。

The finite element software was used to simulate the tensile failure process of rock bridge with different crack angles based on pre-cracks in the rock bridge.Under the condition of uniaxial compression,the results showed that for two parallel pre-cracks with the same size and distance,the extension level of pre-crack is different and with different crack angles;The bigger the crack angle is,the easier the rock bridge goes to tensile fracture.The '∧' type crack is more stable than that with parallel type.