摘要
为研究钻孔爆破冲击载荷在岩体节理面的传播机制,设定了两种不同节理形式的模型,并对节理面的应力分布、振动速度、位移分布进行了数值研究。研究结果表明,节理面厚度固定不变时,随着炮孔距节理面空间距离的增加,节理面动态响应明显减弱,而在空间距离固定的情况下,随节理面厚度的增加同样对该面的动力响应存在削弱效应。另外,节理面倾角小于45°时,随倾角增大,应力和振动合速度峰值逐步减弱,而倾角大于45°时,应力和振动合速度峰值又逐渐增强。且以45°倾角为界限,小于45°时应力峰值衰减率逐渐减小,大于45°时应力峰值衰减率逐渐增大,但振动合速度峰值衰减率却一直增大,尤其在倾角大于45°以后,增大程度明显变强。
In order to study the propagation mechanism of borehole blasting impact load on the joint surface of rock,two models with different joint forms were set up,and the stress distribution,vibration velocity and displacement distribution at the joint surface were studied.The results show that when the thickness of the joint surface is fixed,the dynamic response of the joint surface is obviously weakened with the increase of the spatial distance between the blasthole and the joint surface.In the case of fixed spatial distance,the dynamic response of the joint surface is also weakened with the increase of the thickness of the joint surface.In addition,when the dip angle of the joint surface is less than 45°,the peak values of stress and vibration velocity gradually decrease with the increase of the dip angle,while the peak values of stress and vibration velocity gradually increase when the dip angle is greater than 45°.Taking the 45°dip angle as the boundary,the attenuation rate of the peak stress decreases gradually when the dip angle is less than 45°,and increases gradually when the dip angle is greater than 45°.But the attenuation rate of the peak vibration velocity increases all the time,especially when the dip angle is greater than 45°,the degree of increase is obviously stronger.
作者
聂根良
程晓红
周文海
胡才智
凌晓
NIE Genliang;CHENG Xiaohong;ZHOU Wenhai;HU Caizhi;LING Xiao(Department of Construction Engineering,Sichuan Engineering Technical,Deyang,Sichuan 618000,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;School of Petrochemical Engineering,Lanzhou University of Technology,Lanzhou,Gansu 730050,China;Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou,Gansu 730099,China)
出处
《矿业研究与开发》
CAS
北大核心
2023年第11期72-80,共9页
Mining Research and Development
基金
甘肃省教育厅青年博士基金项目(2022QB-046)
甘肃省自然科学基金项目(B061709)。
关键词
钻孔爆破
冲击载荷
节理岩体
动力响应
Borehole blasting
Impact load
Jointed rock
Dynamic response