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中南大学学报(英文版)

Journal of Central South University

Vol. 27    No. 10    October 2020

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Core discing characteristics and mitigation approach by a novel developed drill bit in deep rocks
ZHENG Min-zong(郑民总)1, 2, LI Shao-jun(李邵军)1, YAO Zou(姚邹)3, ZHANG Ao-dong(张奥东)3, XU Ding-ping(徐鼎平)1, ZHOU Ji-fang(周济芳)4

1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Faculty of Engineering, China University of Geosciences, Wuhan 430074, China;
4. Yalong River Hydropower Development Co., Ltd., Chengdu 610051, China

Abstract: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.

 

Key words: core discing; mitigation; drill bit crown; deep rocks; in-situ stress measurements

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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