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基于FDEM的预切缝辅助滚刀破岩研究
Research on rock breaking with pre-cut seam assisted disc cutter based on FDEM
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- DOI:
- 10.3969/j.issn.1001-2206.2025.06.002
- 作者:
- 李明勇, 张帅康, 徐贺明
LI Mingyong, ZHANG Shuaikang, XU Heming
- 作者单位:
- 中交石油天然气管道工程有限公司, 河南郑州 450048
CCCC Petroleum Pipeline Engineering Co., Ltd., Zhengzhou 450048, China
- 关键词:
- 预切缝; 滚刀破岩; 裂纹; 有限-离散元法
pre-cut seam;disc cutter rock breaking;crack;finite-discrete element method
- 摘要:
- 为了探究预切缝对滚刀破岩及其裂纹发展的影响规律，基于有限-离散元法，建立了滚刀作用下含预切缝的岩石数值模型，研究了不同切缝深度与切宽对滚刀破岩效果的影响。分析模拟结果得出如下结论。1)预切缝为岩石的变形提供了补偿空间，岩石受到滚刀作用后，在其下方产生拉伸裂纹，在荷载作用下该裂纹贯通至预切缝底部，形成大块岩渣。2)含预切缝的岩石破碎特征呈现出明显的非对称性；随着切宽与切缝深度的增加，岩渣块度均随之增大；预切缝辅助滚刀破岩过程分为3个阶段，即：弹性阶段、裂纹萌生与快速发育阶段、裂纹缓慢扩展与侧向裂纹贯通阶段。3)预切缝深度为10 mm时，存在60 mm的临界切宽，此时比能最低为2.2 MJ·m-3；切宽为30 mm时，随着预切缝深度的增大，裂纹长度、裂纹数量、滚刀平均荷载、比能均随之降低。研究结果基于特定的数值模型与参数，与工程条件下滚刀真实运动状态有一定差异，因此该研究内容与结论具有一定局限性。
To explore the influence of pre-cut seams on the rock-breaking performance of disc cutters and the development of cracks, this paper, based on the cohesive zone model method, established a numerical model of rock containing pre-cut seams under the action of disc cutters, and it investigated the effects of different cutting depths and widths on rock-breaking by the disc cutters. The analysis of the simulation results reveals the following conclusions: 1) The pre-cut seam provides a compensation space for the deformation of the rock, and after the rock is subjected to the action of the disc cutter, a tensile crack is produced under the disc cutter, which penetrates to the bottom of the pre-cut seam under the action of the load to form a large piece of slag. 2) The crushing characteristics of the rock containing the pre-cut seam show obvious asymmetry; with the increase in the cutting width and cutting depth, the slag mass becomes larger, and the pre-cut seam assisted disc cutter breaking process is divided into three phases: elasticity phase, crack sprouting and rapid development phase, and slow crack expansion and lateral crack penetration phase. 3) When the cutting depth is 10 mm, there is a critical cutting width of 60 mm; at this time, the minimum specific energy is 2.2 MJ·m-3. When the cutting width is 30 mm, with the increase in the cutting depth, the length of cracks, the number of cracks, the average load of the disc cutter, and the specific energy are all reduced. The research results are based on specific numerical models and parameters, and there will be certain differences from the actual disc cutter movement state under engineering conditions. Therefore, the content and conclusions of this study have certain limitations.