Natural fractured rocks usually contain background granular media and multi-scale fractures. The coordination number is a crucial factor to characterize the connection of microstructural elements. On the determination of coordination numbers for modeling fractured rocks is important to interpret micromechanical properties. We have built a consistent workflow of discrete element models (DEMs) coupled with discrete fracture networks (DFNs). This DEM-DFN model could provide a simple formulation for high calculation efficiency to model a more realistic and detailed description of fracture system. A series of numerical experiments are set up, aiming to correlate window radius, nodal spacing, and crack length, which will benefit the window selection for measuring coordination numbers based on the crack characteristics. DEM-DFN modeling of the coordination numbers determined coordination number has the potential for numerical upscaling from the microstructural responses to the macroscopic properties of fractured rocks and identifying crack patterns in the spatial distribution.

中文翻译：

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用于模拟裂隙岩的耦合DEM-DFN模型配位数的确定

天然裂缝性岩石通常包含背景颗粒介质和多尺度裂缝。配位数是表征微观结构元素连接的关键因素。确定用于模拟破裂岩石的配位数对于解释微观力学性质很重要。我们已经建立了离散元模型 (DEM) 与离散裂缝网络 (DFN) 相结合的一致工作流程。这种 DEM-DFN 模型可以提供一个简单的公式来提高计算效率，从而对裂缝系统进行更真实和详细的描述。建立了一系列数值实验，旨在关联窗口半径、节点间距和裂纹长度，这将有利于基于裂纹特征测量坐标数的窗口选择。