摘要
为探究激光参数对破岩效果的影响,开展激光辐照岩石穿孔效应研究。借助MATLAB软件获取熔蚀坑孔洞周围热裂纹宏观拓展形貌,揭示激光破岩参数对岩石热裂解特性影响。分析激光耗能与熔蚀坑孔洞体积间的定量关系,阐明激光参数对穿孔比能、切口比能和钻进速度的影响规律。结果表明:激光辐照岩石过程中首先在辐照点周围生成熔蚀坑孔洞,随后孔洞周围的热致微裂纹扩展发育形成辐射性宏观热裂纹;随着激光功率和辐照时间的增加,岩石热裂纹累积总面积及累积总长度增加,熔蚀坑孔洞体积也逐渐增大;兼顾熔蚀坑孔洞体积、宏观热裂纹形成条件以及破岩效能,建议激光功率不小于4 kW,同时辐照时间不超过5 s。
In order to investigate the influence of laser parameters on the rock breaking effect,a study on the perforation effect of laser irradiated rock was carried out.With the help of MATLAB software,the macroscopic expansion morphology of thermal cracks around the melting pit holes was obtained,and the influence of the laser rock breaking parameters on the thermal cracking characteristics of the rock was revealed.The quantitative relationship between the laser energy consumption and the melting pit hole volume was analyzed,and the influence laws of laser parameters on specific energy and specific kerfing energy and rate of penetration were elucidated.The results showed that laser irradiated rock first generated melting pit holes around the irradiation point,and then the thermal microcracks around the holes expanded and developed to form radiative macroscopic thermal cracks.With the increase of laser power and irradiation time,the cumulative total area and cumulative total length of sandstone thermal cracks increased,and the volume of melting pit holes gradually increased.Taking into account the melting pits volume,macroscopic thermal crack formation conditions,and rock-breaking efficiency,it was recommended that the laser power should not be less than 4 kW,and the irradiation time should not exceed 5 s.
作者
胡瑶瑶
徐彬
马川义
黄新杰
张波
李彪
HU Yaoyao;XU Bin;MA Chuanyi;HUANG Xinjie;ZHANG Bo;LI Biao(Shandong Hi-speed Group Co.,Ltd.,Jinan 250098,Shandong,China;Institute of Geotechnical and Underground Engineering,Shandong University,Jinan 250061,Shandong,China;School of Qilu Transportation,Shandong University,Jinan 250002,Shandong,China;School of Civil Engineering,Shandong University,Jinan 250061,Shandong,China)
出处
《山东大学学报(工学版)》
CSCD
北大核心
2024年第6期72-81,共10页
Journal of Shandong University(Engineering Science)
关键词
热裂纹
熔蚀坑孔洞
比能
切口比能
钻进速度
thermal crack
melting pit hole
specific energy
specific kerfing energy
rate of penetration
作者简介
第一作者:胡瑶瑶(1989-),女,山东诸城人,硕士,工程师,主要研究方向为隧道设计。E-mail:734948276@qq.com;通信作者:李彪(1991-),男,安徽宿州人,博士,主要研究方向为高压水射流辅助掘进机高效破岩技术。E-mail:717520670@qq.com。
