不同微波作用模式下深部巷道砂岩的破坏行为和能量演化特征
Failure behavior and energy evolution characteristics of deep roadway sandstone under different microwave irradiation modes
唐茂颖 1高明忠 2李树武 3杨本高 4唐瑞烽 4李飞 4刘军军5
作者信息
- 1. State Key Laboratory of Hydraulics and Mountain River Engineering,College of Water Resource&Hydropower,Sichuan University,Chengdu 610065,China;Northwest Engineering Corporation Limited,Xi'an 710065,China;Qinghai Electric Power Company of CHN Energy Group,Xining 810000,China
- 2. State Key Laboratory of Hydraulics and Mountain River Engineering,College of Water Resource&Hydropower,Sichuan University,Chengdu 610065,China;Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization,Institute of Deep Earth Sciences and Green Energy,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China
- 3. Northwest Engineering Corporation Limited,Xi'an 710065,China
- 4. State Key Laboratory of Hydraulics and Mountain River Engineering,College of Water Resource&Hydropower,Sichuan University,Chengdu 610065,China
- 5. State Key Laboratory of Hydraulics and Mountain River Engineering,College of Water Resource&Hydropower,Sichuan University,Chengdu 610065,China;Northwest Engineering Corporation Limited,Xi'an 710065,China
- 折叠
摘要
有效破碎硬岩和预防并控制岩爆灾害是深部高地应力区施工的两个关键问题,也是确保深部工程安全高效施工的两条最重要的途径.本文以微波作用下坚硬砂岩的致裂弱化为出发点,以单次微波辐照处理的持续时间为变量,同时结合力学测试和声发射监测方法,论证了微波作用对防治岩爆灾害的可能性.结果表明,在微波作用下,坚硬砂岩的裂纹损伤应力占比从77％下降到62％;耗散能占比从6％增加到20％,基于能量的脆性指数从0.94下降到0.72;声发射监测结果表明,经微波作用后,砂岩的平静期从总时间的56.2％和59.6％大幅缩短至11.5％和8.6％.在本试验中,1 kW微波作用时长的阈值为2 min,超过该阈值时,岩石就会受到不可逆损伤.本研究可为深部高地应力区高效、安全破岩提供必要的理论支持和技术指导.
Abstract
Efficient breaking of hard rock and prevention and control of rock burst disasters are two key concerns for construction in deep areas with high in-situ stresses and are two of the most important ways to ensure the safe and efficient construction of deep engineering. Therefore, this study considers microwave weakening and fracturing of hard rock, taking the duration of a single microwave irradiation treatment as a variable, and synchronously combines mechanical testing and acoustic emission monitoring methods to demonstrate the possibility of rock burst disaster prevention and the control with this treatment method. The result shows that under microwave irradiation, the proportion of crack damage stress decreased from 77％ to 62％; the proportion of dissipated energy increased from 6％ to 20％, and the energy-based brittleness index also decreased from 0.94 to 0.72; acoustic emission monitoring found that after microwave irradiation, the quiet stage of the rock was greatly reduced from 56.2％ and 59.6％ to 11.5％ and 8.6％ with the monitoring time. In this test, the threshold of the duration of 1 kW microwave irradiation is 2 min; beyond this threshold, the rock is irreversibly damaged. The research results can provide necessary theoretical support and technical guidance for efficient and safe rock breaking in deep areas with high in situ stresses.
关键词
微波/砂岩/声发射/能量/脆-延性转变Key words
microwaves/sandstone/acoustic emission/energy/brittle-ductile transformation引用本文复制引用
基金项目
Science Fund for Distinguished Young Scholars in Shenzhen,China(RCJC20210706091948015)
National Natural Science Foundation of China(U2013603)
出版年
2023
NETL
NSTL
维普
万方数据