摘要：co.e discing often occurs in deep rocks under high-stress co.ditions and has been identified as an important characteristic for deep rock *** paper presents the formation mechanism of co.e discing ***,the interaction between diamond drill bits and rock was analyzed based on numerical modeling.A novel drill bit with an inner co.ical crown for the mitigation of co.e discing was designed and verified by simulation *** mitigation method was applied in the cavern B1 of CJPL-Ⅱand satisfactory results had been *** percentage of co.e discing had been obviously decreased from 67.8%when drilling with a rectangular crown drill bit,to 26.5%when an inner co.ical crown drill bit had been *** paper gives full insight into co.e discing characteristics and provides a new method for co.e discing mitigation;it will potentially co.tribute to stress measurement in deep rock engineering.