The complexity and high frequency of fractures in rock masses make discrete fracture network (DFN) models suffer from burdensome computational consumption when every fracture is explicitly simulated. Meanwhile, the uncertainty in the spatial distribution of fractures also leads to the unnecessary explicit simulation of small fractures to achieve more accurate results. In this study, an equivalent discontinuum analysis (EDA) method is proposed to deal with complexly fractured rock masses in the deep underground. An equivalent discrete fracture network (E-DFN) with simple geometric configurations is extracted based on a defined significance index of fractures. The influence of fractures that are neglected in E-DFNs is superposed on the remaining fractures by reassigning their material properties. Using the proposed EDA method, the anisotropy of the deformation modulus of the original DFN model is well represented by the E-DFN models. Compared with the equivalent continuum and discontinuum models, the E-DFN models with reassigned fracture properties have a better potential for maintaining stress variability and displacement discontinuity in rock masses.

岩体中裂缝的复杂性和高频率使得离散裂缝网络 (DFN) 模型在明确模拟每条裂缝时遭受繁重的计算消耗。同时，裂缝空间分布的不确定性也导致了为了获得更准确的结果而不必要地对小裂缝进行显式模拟。在这项研究中，提出了一种等效不连续分析（EDA）方法来处理地下深层复杂裂隙岩体。基于定义的裂缝显着性指数，提取具有简单几何配置的等效离散裂缝网络 (E-DFN)。通过重新分配材料属性，将 E-DFN 中被忽略的裂缝的影响叠加到其余裂缝上。使用提出的 EDA 方法，E-DFN模型很好地体现了原始DFN模型的变形模量的各向异性。与等效的连续体和不连续体模型相比，具有重新分配的断裂属性的 E-DFN 模型在保持岩体中的应力变异性和位移不连续性方面具有更好的潜力。