含单裂隙花岗岩单轴压缩破裂行为GBM3D研究

Fracture behavior of granite specimen containing a single fissure under uniaxial compression by grain-based model 3D

探究含裂隙花岗岩力学行为对地热开采及核废料处置库具有重要意义.为了考虑花岗岩晶粒嵌锁及转动阻力效应,本文使用GBM3D开展了含单裂隙花岗岩破裂行为研究.研究结果表明GBM3D可用于研究含不同矿物成分花岗岩力学行为研究,同时可以提供破裂过程中更多的信息.破裂过程中晶间裂纹首先萌生,而穿晶裂纹主要集中在峰后萌生扩展.相较于在相同矿物晶粒之间,在不同矿物晶粒间萌生的裂纹更多,同时在云母中的穿晶裂纹更容易产生且数量较多.翼裂纹主要由晶粒边界裂纹组成,且在不同深度形状不同,而反向翼裂纹在不同深度形状相似.

The understanding of the mechanical behavior of granite containing fissures is of great significance for geothermal energy exploitation and high-level nuclear waste disposal repository.To consider the grain interlocking and rotational resistance behavior in granite specimens,the grain-based model 3D(GBM3D)was constructed to investigate the fracture behavior of granite specimens containing a single fissure.The numerical result indicates that this GBM3D can be used to investigate the mechanical behavior of granite constituted by different minerals,and it can provide more information to understand the mechanical behavior of specimens under loading process.The inter-granular cracks initiate in the first place,but the initiation of intra-granular cracks mainly concentrates after the peak strength.The tensile cracks between different minerals are more than that between the same minerals,and the intra-granular cracks in muscovite initiate firstly,and the number of them is more than that in other minerals.The wing crack is mainly constituted by the inter-granular cracks,and the shape of it is different in different depths,whereas the anti-wing is similar in different depths.