This investigation aims to explore the effects of stress conditions and rock cutting rates on hard rock frag-mentation through indentation tests on a newly designed triaxial testing apparatus.This apparatus was designed to realize a triaxial loading and indentation test of cylindrical specimens using inserted tooth cutter.The boreability and crushing efficiency of granite rock was investigated by analyzing the change rules of the thrusting force,penetration depth,characteristics of chippings and failure patterns.Several quantitative indexes were used to evaluate rock boreability in this investigation.The granite rock sam-ples all had a chiselled pit and a crushed rock core.Under initial stress conditions,only flat-shape chip-pings were stripped from the rock surface when the thrusting force reached 20 kN.The rock cutting special energy had a close correlation with the initial stress conditions and inserted tooth shape.Moreover,a thrusting force prediction model was proposed in this paper.The contribution of this study is that for the first time the influence mechanism of the initial triaxial stress conditions on rock fragmen-tation is investigated using an inserted tooth and the newly designed testing apparatus.This study has a crucial importance for practical underground hard rock crushing in geoengineering.

Jiuqun Zou;Weihao Yang;Tao Zhang;Xiaofei Wang;Min Gao

School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China;State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116,China;School of Transportation and Civil Engineering,Nantong University,Nantong 226000,China

矿业科学技术学报（英文版）

[1]Jiuqun Zou;Weihao Yang;Tao Zhang;Xiaofei Wang;Min Gao-.Experimental investigation on hard rock fragmentation of inserted tooth cutter using a newly designed indentation testing apparatus)[J].矿业科学技术学报（英文版）,2022(03):459-470

boreability,chippings,chiselled,pings,geoengineering

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