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Investigation of Damage Evolution in Heterogeneous Rock Based on the Grain-Based Finite-Discrete Element Model

机译：基于粮食的有限离散元模型的异相岩损伤演化研究

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摘要

Granite exhibits obvious meso-geometric heterogeneity. To study the influence of grain size and preferred grain orientation on the damage evolution and mechanical properties of granite, as well as to reveal the inner link between grain size‚ preferred orientation, uniaxial tensile strength (UTS) and damage evolution, a series of Brazilian splitting tests were carried out based on the combined finite-discrete element method (FDEM), grain-based model (GBM) and inverse Monte Carlo (IMC) algorithm. The main conclusions are as follows: (1) Mineral grain significantly influences the crack propagation paths, and the GBM can capture the location of fracture section more accurately than the conventional model. (2) Shear cracks occur near the loading area, while tensile and tensile-shear mixed cracks occur far from the loading area. The applied stress must overcome the tensile strength of the grain interface contacts. (3) The UTS and the ratio of the number of intergrain tensile cracks to the number of intragrain tensile cracks are negatively related to the grain size. (4) With the increase of the preferred grain orientation, the UTS presents a “V-shaped” characteristic distribution. (5) During the whole process of splitting simulation, shear microcracks play the dominant role in energy release; particularly, they occur in later stage. This novel framework, which can reveal the control mechanism of brittle rock heterogeneity on continuous-discontinuous trans-scale fracture process and microscopic rock behaviour, provides an effective technology and numerical analysis method for characterizing rock meso-structure. Accordingly, the research results can provide a useful reference for the prediction of heterogeneous rock mechanical properties and the stability control of engineering rock masses.
机译：花岗岩表现出明显的中间几何异质性。研究晶粒尺寸和优选晶粒取向对花岗岩损伤演化和力学性能的影响，以及露出晶粒尺寸，优选取向，单轴拉伸强度（UTS）和损伤进化之间的内部链路，这是一系列巴西人基于组合的有限元元素（FDEM），基于谷物的模型（GBM）和逆蒙特卡罗（IMC）算法进行分离测试。主要结论如下：（1）矿物粒度显着影响裂缝传播路径，而GBM可以比传统模型更精确地捕获断裂部分的位置。 （2）在装载面积附近发生剪切裂缝，而拉伸和拉伸剪切混合裂缝远离负载区域。施加的应力必须克服晶粒界面触点的拉伸强度。 （3）UTS和骨膜张力裂纹的数量与腔内拉伸裂缝的数量的比率与晶粒尺寸负相关。 （4）随着优选的晶粒取向的增加，UTS呈现“V形”特征分布。 （5）在分裂模拟的整个过程中，剪切微裂纹在能量释放中发挥着主导作用;特别是，它们发生在后期。这种新型框架，可以揭示脆性岩石异质性对连续不连续的跨尺度断裂过程和微观岩石行为的控制机制，提供了一种用于表征岩石间结构的有效技术和数值分析方法。因此，研究结果可以为预测异质岩机械性能和工程岩体的稳定性控制提供有用的参考。

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