摘要：The success of waterjet drilling technology requires further insight into the rock failure mechanisms under waterjet impingement. By combining acoustic emission (AE) sensing and underwater sound recording techniques, an online system for monitoring submerged waterjet drilling has been developed. For four types of sedimentary rocks, their AE characteristics and correlations to the drilling performance have been obtained through time-frequency spectrum analysis. The area under the power spectrum density curve has been used as the indicator of AE energy. The results show that AE signals from the fluid dynamics and the rock failure are in different ranges of signal frequency. The main frequencies of the rock failure are within the higher range of 100-200 kHz, while the frequencies of the fluid dynamics are below 50 kHz. Further, there is a linear relationship between the AE energy and the drilling depth irrespective of rock type. The slope of the linear relationship is proportional to the rock strength and debris size. Furthermore, the AE-specific energy is a good indicator of the critical depth drilled by the waterjet. In conclusion, the AE characteristics on the power density and dominant frequency are capable of identifying the waterjet drilling performance on the rock materials and are correlated with the rock properties, i.e., rock strength and cutting size.

关键字：Waterjet Acoustic emission Rock fragmentation Time-frequency analysis

ISSN号：0723-2632

卷、期、页：卷: 50 期: 10 页: 2785-2794

发表日期：2017-10-01

期刊分区（SCI为中科院分区）：二区

收录情况：SCI（科学引文索引印刷版）,ESI（基本科学指标数据库）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：ROCK MECHANICS AND ROCK ENGINEERING

通讯作者：李召坤

第一作者：田守嶒,盛茂,葛洪魁,李根生

论文类型：期刊论文

论文概要：田守嶒,盛茂,李召坤,葛洪魁,李根生，Acoustic Emission Characteristics of Sedimentary Rocks Under High-Velocity Waterjet Impingement，ROCK MECHANICS AND ROCK ENGINEERING，2017，卷: 50 期: 10 页: 2785-2794

论文题目：Acoustic Emission Characteristics of Sedimentary Rocks Under High-Velocity Waterjet Impingement