摘要
为探究深部开采中微波辅助破岩能量耗散规律,以磁铁石英岩为研究对象,采用微波照射与带围压装置的SHPB相结合的方法,进行不同围压条件下的循环冲击试验,分析不同微波参数辐射试件破碎的能耗特征。研究结果表明:与未经微波辐射试件相比,微波损伤后的试件,在围压及冲击荷载的共同作用下,试件波阻抗波动较大,导致受高功率、短时间的微波参数M1试件在围压2 MPa、4 MPa和受低功率、长时间微波参数的M2试件在围压6 MPa时,试件的能量占比随冲击次数波动较大;未经微波辐射、受微波参数M1及受微波参数M2的试件分别在围压6 MPa、6 MPa和4 MPa时,其破碎能耗最小;受微波辐射试件的耗散能远小于未经微波辐射试件的耗散能,且两种微波参数辐射试件的P波波速大小与其能耗成反比,故在微波辅助破岩实际应用中,应选择合适的微波参数。
In order to explore the energy dissipation law of microwave-assisted rock breakage in deep mining,the magnetite quartzite was taken as the research object.The cyclic impact tests under different confining pressures were carried out by the method combining microwave radiation and SHPB with confining pressure device,and the energy dissipation characteristics of specimens irradiated by different microwave parameters were analyzed.The results are concluded as follows.Firstly,compared with the specimens without microwave radiation,the wave impedance of the damage specimens after microwave radiation fluctuates greatly under the combined action of confining pressure and impact pressure.It causes that the energy proportion of certain specimens fluctuates greatly with the increase of impact numbers,when the M1 specimen is under the confining pressures of 2 MPa and 4 MPa,or the M2 specimen is under the confining pressure of 6 MPa.The M1 specimen is irradiated by high-power and short-period microwaves,and the M2 specimen is irradiated by low-power and long-period microwaves.Secondly,the energy utilization rates of the specimen without microwave radiation,the M1 specimen and the M2 specimen are the best under confining pressures of 6 MPa,6 MPa and 4 MPa.Thirdly,the dissipation energy of the specimen irradiated by microwave is far less than that of the specimen without microwave radiation,and the P wave velocity of the specimen irradiated by M1 and M2 microwave parameters is inversely proportional to its energy dissipation.Therefore,in the practical application of microwave-assisted rock breakage,appropriate microwave parameters should be selected.
作者
陈超
张震
马姣阳
李洪宝
CHEN Chao;ZHANG Zhen;MA Jiaoyang;LI Hongbao(College of Mining Engineering,North China University of Science and Technology,Tangshan,Hebei 063210,China;Mining Development and Safety Technology Key Lab of Hebei Province,Tangshan,Hebei 063210,China)
出处
《矿业研究与开发》
CAS
北大核心
2022年第5期26-32,共7页
Mining Research and Development
基金
国家自然科学基金资助项目(52074124)
河北省自然科学基金项目(E2020209009)。
关键词
磁铁石英岩
主动围压
微波辐射
循环冲击
能量耗散率
Magnetite quartzite
Active confining pressure
Microwave radiation
Cyclic shock
Energy dissipation rate
