Detection of 3D rock block contacts by penetration edges

Abstract

在三维单元法、三维不连续变形分析法中,三维块体的接触判断是关键的问题之一。对三维凸多面体的所有接触形式进行了分类,提出了一种三维块体接触判断的侵入边法。给出了侵入边法的原理、方法实施步骤及识别接触形式的方法。通过论证和算例表明,所提出的方法计算工作量小、鲁棒性好,容易于计算机实现。 Detection of contacts between 3D blocks is a key problem in 3D DDA(discontinuous deformation analysis)and DEM (discrete element method) analysis. In this paper,the limitations of the approaches commonly used to detect 3D block contacts are discussed. A new approach called penetration edges method is put forward for the detection of contacts in 3D blocks system,and the contacts between two 3D blocks are classified into seven types. The principle of this new approach is robust and can overcome the limitations of the commonly used methods. This new method can greatly reduce the amount of calculation and is easy to be coded for analysis.