世界核地质科学2025，Vol.42Issue(3)：618-629,12.DOI:10.3969/j.issn.1672-0636.2025.03.012
基于侵入试验的不同磨损滚刀下北山花岗岩破岩机理研究
Study on rock fragmentation mechanism of Beishan granite under different worn cutters by indentation test
摘要
Abstract
The rock fragmentation mechanism of worn disc cutters provides theoretical guidance for TBM cutter changing.To investigate the correlation between cutter force and penetration depth,evaluate rock fragmentation efficiency,and elucidate the fragmentation mechanism of single worn cutter in extremely hard rock conditions,different blade widths were utilized to represent different wear levels.This study employed sequential indentation tests using both a new cutter with blade width of 17 mm and worn cutters with different blade widths on Beishan granite specimens with dimension of 420 mm×400 mm×500 mm.The penetration process,force characteristics,rock fragmentation volume,and specific energy were systematically analyzed.The key findings include:1)Both new and worn cutters exhibited consistent rock failure phases-initial compaction followed by linear deformation,with intermittent force drops during single penetration,2)During sequential penetrations with the same depth for the new cutter,both the maximum penetration force and the force growth rate in linear-deformation stage demonstrated an initial increase then decrease,3)Worn cutters with larger blade widths required higher average force per unit penetration depth.For each kind of worn cutter,the force-depth ratio of each penetration showed fluctuating tendency during the whole sequential penetration process,confirming the cyclic process of energy accumulation,release and then re-accumulation,4)Specific energy increased linearly with blade width while the penetration capability decreased correspondingly.The 18 mm-blade cutter exhibited optimal rock fragmentation efficiency and penetration performance in sequential penetration.关键词
磨损刀/累次组合侵入破岩试验/刃宽/侵入力/比能/破岩效率Key words
worn disc cutters/sequential indentation test with combination of new cutter and worn cutter/blade width/penetration force/specific energy/rock fragmentation efficiency分类
建筑与水利引用本文复制引用
郑植,马洪素,殷丽君,孙健,王驹..基于侵入试验的不同磨损滚刀下北山花岗岩破岩机理研究[J].世界核地质科学,2025,42(3):618-629,12.基金项目
中核集团基础科研项目——完整极硬岩双滚刀协同破岩机理研究(编号:CNNC-JCYJ-202307)资助. Supported by CNNC Basic Research Project-Study on the mechanism of rock fragmentation by double disc cutters in intact and extremely hard rock(No.CNNC-JCYJ-202307) （编号:CNNC-JCYJ-202307）
