基于三维离散元的滚刀破岩机理研究

Study on Hobbing Cutter Rock Breaking Mechanism Based on 3D DEM

为研究滚刀破岩机理,借助CAD建模技术,高效精确地生成了盘形滚刀模型,采用三维颗粒流方法模拟盘形滚刀破岩过程,分析了盘形滚刀破岩机理。研究结果表明,随着刀盘贯入度的增加,裂纹数量呈跳跃式快速增加,且主要集中在滚刀刀刃两侧2 cm范围内,沿滚刀运动迹线发展。剪裂纹数量略大于拉裂纹,但总体相当,岩石表现出拉伸-剪切综合破坏模式。随着滚刀侵入岩体,法向推力、切向滚动力和侧向力均波动剧烈,但法向推力变化范围不随贯入度变化,切向滚动力和侧向力波动范围则随着贯入度的增加而增加。

In order to study the hobbing cutter rock breaking mechanism,with the aid of CAD modeling technology,precise disk cutter model was established efficiently. Three-dimensional particle flow code（ PFC3D） was employed to carry out numerical simulations for understanding the rock breaking by disc cutters.Numerical results show that as the penetration increases,the crack number grows with jump and the crack occurs mainly within 2 cm of the edge of the disk cutter and develops along the trace of moving cutter. The number of shear cracks is slightly more than that of tension cracks,but equal generally,demonstrating that the rock breaking is of a combination of shear-tension mode. As the disk cutter intrudes the rock,the normal thrust,tangential rolling force and side force all change with large fluctuation,the normal force is insensitive to penetration,while the latter two increase as penetration grows.