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NUMERICAL SIMULATION OF FAILURE PROCESS AROUND CIRCULAR OPENINGS IN GRANITE ROCK

机译:花岗岩岩石圆孔破坏过程的数值模拟

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Digital image processing-based Rock Failure Process Analysis code, abbreviated as RFPA2D-DIP, is introduced to simulate progressive failure of circular openings in granite rock. The proposed method incorporates digital image processing technologies and vector transformation methods. The surface image of rock can be directly imported into the code. First, the actual heterogeneity of rock is extracted from the image by DIP function of RFPA. Second, the image characterized meso-structure is automatically transformed into grid data of finite element method. The mesomaterials, composing of rock components, such as mineral grains and flaws, are classified into different material groups according to their colour characteristic and assigned with their own mechanical properties. In this way, the influence of actual mesostructure can be taken into account during the analysis of mechanical response and failure process. Then an image of granite is taken as an example to demonstrate the proposed method. The progressive failure around circular excavation in granite rock, involving initiation, propagation and coalescence of fractures, is simulated by a factitious increasing of in situ stresses. The proposed code is validated by comparing simulated fracturing pattern with those reported in previous studies. Finally, failure mechanisms are identified for different lateral pressure coefficients. The results show that the heterogeneity of rock can play an important role in the failure behaviours of rock under external loading.
机译:引入了基于数字图像处理的岩石破坏过程分析代码,简称RFPA2D-DIP,以模拟花岗岩岩石中圆形孔洞的渐进破坏。所提出的方法结合了数字图像处理技术和矢量变换方法。岩石的表面图像可以直接导入代码中。首先,通过RFPA的DIP函数从图像中提取出岩石的实际异质性。其次,将具有细观结构特征的图像自动转换为有限元方法的网格数据。由岩石成分(例如矿物颗粒和瑕疵)组成的介观材料根据其颜色特征分类为不同的材料组,并具有各自的机械性能。这样,在分析机械响应和破坏过程时,可以考虑实际细观结构的影响。然后以花岗岩图像为例来说明所提出的方法。通过原地应力的人为增加模拟了花岗岩岩石中圆形开挖周围的渐进破坏,包括裂缝的萌生,扩展和合并。通过将模拟压裂模式与先前研究中报道的压裂模式进行比较,对所提出的代码进行了验证。最后,针对不同的侧向压力系数确定失效机理。结果表明,岩石的非均质性在外部荷载作用下对岩石的破坏行为起着重要的作用。

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