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

作     者：ZHENG Min-zong LI Shao-jun YAO Zou ZHANG Ao-dong XU Ding-ping ZHOU Ji-fang 郑民总;李邵军;姚邹;张奥东;徐鼎平;周济芳

作者机构：State Key Laboratory of Geomechanics and Geotechnical EngineeringInstitute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China University of Chinese Academy of SciencesBeijing 100049China Faculty of EngineeringChina University of GeosciencesWuhan 430074China Yalong River Hydropower Development Co.Ltd.Chengdu 610051China 

基　　金：Projects(U1765206 51979268 51621006)supported by the National Natural Science Foundation of China 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2020年第27卷第10期

页      码：2822-2833页

摘      要：Core discing often occurs in deep rocks under high-stress conditions and has been identified as an important characteristic for deep rock *** paper presents the formation mechanism of core discing ***,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 *** mitigation method was applied in the cavern B1 of CJPL-Ⅱand satisfactory results had been *** 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 *** 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.

主 题 词：core discing mitigation drill bit crown deep rocks in-situ stress measurements 

学科分类：081901[081901] 0819[工学-海洋工程类] 08[工学] 

核心收录：

D　O　I：10.1007/s11771-020-4512-x

馆 藏 号：203987201...