Fracture and fragmentation of rock under various loadings or in multi-field conditions are important topics in many rock engineering scenarios. Numerical tools are commonly applied to evaluate the rock deformation and progressive failure process, while the accuracy and efficiency of the analysis are closely related to the applied fracture models. In this paper, an improved discontinuous deformation analysis (DDA) program with the distributed bond (DB) is proposed for rock deformation and rock fragmentation analysis. The jointed rock model is regarded as an assembly of triangular elements connected with DBs and contacts. The DB uses distributed constraints to bond the co-edge elements for continuous deformation modeling, and the fracturing and fragmentation of rock material is fulfilled by progressive DB failure with linear and nonlinear bond constitutive models. The theory, formulation, and implementation of DB in DDA framework are given in detail. The feasibility and accuracy of the proposed DB in simulating rock deformation and failure process are verified by several examples.

岩石在各种载荷或多场条件下的断裂和破碎是许多岩石工程场景中的重要课题。数值工具通常用于评估岩石变形和渐进破坏过程，而分析的准确性和效率与应用的裂缝模型密切相关。在本文中，提出了一种改进的具有分布式键 (DB) 的非连续变形分析 (DDA) 程序，用于岩石变形和岩石破碎分析。节理岩石模型被认为是由 DB 和触点连接的三角形单元的组合。DB 使用分布式约束来绑定共边元素以进行连续变形建模，岩石材料的压裂和破碎通过线性和非线性键本构模型的渐进 DB 破坏来实现。详细给出了DDA框架中DB的理论、制定和实现。通过几个实例验证了所提出的DB在模拟岩石变形和破坏过程中的可行性和准确性。