基于颗粒形状的节理花岗岩力学性能颗粒流模拟研究

Numerical Simulation Research Based on Particle Shape of Joint Mechanical Property of Gneissic Granite by Particle Flow Code

以齐热哈塔尔水电站的片麻花岗岩为研究背景,基于颗粒流数值理论,采用离散单元法,运用其内置的Fish语言建立由不同形状的clump单元组成的片麻花岗岩数值模型。通过预制7种不同倾角的光滑节理模型来分析片麻花岗岩节理方向性下的力学响应与损伤机制。研究结果表明:不同倾角下节理岩体的破坏模式为三种类型:翼裂纹的张拉模式、剪切模式、拉剪复合耦合模式,倾角为60°岩样相比于其余倾角强度最低,拉应力引起的裂纹起裂是导致各种宏观破坏的主要诱因,研究成果可为实际工程提供指导意义。

With the project background of Qirehater hydropower station,the gneissic granite numerical models were constituted with different shapes of clump cell,in which the PFC( particle flow code) theory was introduced.Gneissic granite joint mechanical Response and damage mechanism were analysis by prefabricated seven different angle SJM model. The research indicated that: the joint failure modes of gneissic granite joint under different angle were the wing crack tensile mode,shear mode,combined tensile with shear mode. Comparing with other angles that the 60 degree was the lowest. The crack caused tensile stress was the main inducement that causes various macro failure. The research results can provide guidance for practical engineering.