Core discing characteristics and mitigation approach by a novel developed drill bit in deep rocks

doi:10.1007/s11771-020-4512-x

	Core discing characteristics and mitigation approach by a novel developed drill bit in deep rocks
	Zheng, Min-zong 1,2; Li, Shao-jun 1; Yao, Zou 3; Zhang, Ao-dong 3; Xu, Ding-ping 1; Zhou, Ji-fang 4
刊名	JOURNAL OF CENTRAL SOUTH UNIVERSITY
	2020-10-01
卷号	27 期号:10 页码:2822-2833
关键词	core discing mitigation drill bit crown deep rocks in-situ stress measurements
ISSN号	2095-2899
DOI	10.1007/s11771-020-4512-x
英文摘要	Core discing often occurs in deep rocks under high-stress conditions and has been identified as an important characteristic for deep rock engineering. This paper presents the formation mechanism of core discing firstly. Then, the interaction between diamond drill bits and rock was analyzed based on numerical modeling. A novel drill bit with an inner conical crown for the mitigation of core discing was designed and verified by simulation experiments. The mitigation method was applied in the cavern B1 of CJPL-II and satisfactory results had been achieved. The percentage of core discing had been obviously decreased from 67.8% when drilling with a rectangular crown drill bit, to 26.5% when an inner conical crown drill bit had been adopted. This paper gives full insight into core discing characteristics and provides a new method for core discing mitigation; it will potentially contribute to stress measurement in deep rock engineering.
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	JOURNAL OF CENTRAL SOUTH UNIV
WOS记录号	WOS:000590273400002
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/25165]
专题	中科院武汉岩土力学所
通讯作者	Li, Shao-jun
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.China Univ Geosci, Fac Engn, Wuhan 430074, Peoples R China 4.Yalong River Hydropower Dev Co Ltd, Chengdu 610051, Peoples R China
推荐引用方式 GB/T 7714	Zheng, Min-zong,Li, Shao-jun,Yao, Zou,et al. Core discing characteristics and mitigation approach by a novel developed drill bit in deep rocks[J]. JOURNAL OF CENTRAL SOUTH UNIVERSITY,2020,27(10):2822-2833.
APA	Zheng, Min-zong,Li, Shao-jun,Yao, Zou,Zhang, Ao-dong,Xu, Ding-ping,&Zhou, Ji-fang.(2020).Core discing characteristics and mitigation approach by a novel developed drill bit in deep rocks.JOURNAL OF CENTRAL SOUTH UNIVERSITY,27(10),2822-2833.
MLA	Zheng, Min-zong,et al."Core discing characteristics and mitigation approach by a novel developed drill bit in deep rocks".JOURNAL OF CENTRAL SOUTH UNIVERSITY 27.10(2020):2822-2833.