In the present work, a methodology for setting up virgin stress conditions in discrete element models is proposed. The developed algorithm is applicable to discrete or coupled discrete/continuum modeling of underground excavation employing the discrete element method (DEM). Since the DEM works with contact forces rather than stresses there is a need for the conversion of pre-excavation stresses to contact forces for the DEM model. Different possibilities of setting up virgin stress conditions in the DEM model are reviewed and critically assessed. Finally, a new method to obtain a discrete element model with contact forces equivalent to given macroscopic virgin stresses is proposed. The test examples presented show that good results may be obtained regardless of the shape of the DEM domain.

中文翻译：

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在离散单元模型中设置原始应力条件

在目前的工作中，提出了一种在离散单元模型中设置原始应力条件的方法。所开发的算法适用于采用离散元方法 (DEM) 的地下开挖的离散或耦合离散/连续体建模。由于 DEM 使用接触力而不是应力，因此需要将预开挖应力转换为 DEM 模型的接触力。审查并严格评估了在 DEM 模型中设置原始应力条件的不同可能性。最后，提出了一种新方法来获得接触力等于给定宏观原始应力的离散单元模型。提供的测试示例表明，无论 DEM 域的形状如何，都可以获得良好的结果。