基于格构模型的岩石类材料破坏过程的数值模拟

本文采用二维格构模型在细观尺度上模拟岩石类材料的破坏过程。格构模型将连续介质离散为由弹性杆或梁单元组成的二维格构网格，单元采用简单的本构关系和破坏准则，单元之间的参数可互有差异，以引入材料的非均质性。在外载作用下对整体网格进行线弹性分析，计算出格构中各单元的局部应力，超过断裂阈值的单元将破坏，材料的破坏过程通过单元的依次破坏来模拟。本文使用格构模型分析了单轴拉伸破坏和单边切口梁的剪切破坏。数值模拟结果表明，格构模型可作为岩石、混凝土类材料破坏分析的一种有效方法。

Lattice model for simulating failure process of rock

A lattice model is developed to simulate the failure process of heterogeneous brittle materials.It is assumed that a continuum canbe represented at the meso level by a connected lattice of elastic brittle truss of beam elements.The heterogeneity of the material can be implemented following different manners.The process of fracture is simulated by performing a linear elastic analysis of the lattice under loading and removing an element from thelattice that exceeds a certain failure threshold.After removal of an element theanalysis is repeated.With this model,uniaxial tension and four point shear experiments of single edge notched beams are simulated.It is shown that the simulated crack patterns appear quite realistic.