摘要
岩爆往往释放高冲击能量,对隧道施工构成重大威胁.聚酯纤维柔性防护网具有吸能性强、质量轻的优点,在岩爆防护领域展现出显著潜力.为了研究柔性网在岩爆冲击过程中的力学行为,开展了多工况数值模拟研究.通过静力学试验确定了条带和节点的力学参数,并根据试验结果标定了柔性网数值模型.通过3D扫描技术收集典型岩爆爆块等比网格模型.建立了隧道拱顶防护数值模型,开展了不同爆块形状和冲击能量下的仿真.研究结果表明:(1)柔性网的变形主要受爆块与网面接触面积和爆块质量控制;(2)当柔性网位移最大时,柔性网冲击位置最近的3个锚杆受到最大的拉力,锚杆附近条带、节点分别受到最大的拉力与剥离力;(3)条带和节点的受力与爆块的能量、形状及冲击位置相关,而锚杆的受力主要与冲击能量相关.该研究成果为岩爆柔性防护体系的应用提供了理论依据.
Rock bursts often release high-impact energy,posing a significant threat to tunnel construction.Polyester fiber flexible protective nets,known for their strong energy absorption and light weight,have great potential in mitigating rock burst damage.To investigate the mechanical behavior of these flexible nets during rock burst impacts,multi-scenario numerical simulations were conducted.The mechanical parameters of the strips and nodes were determined through static testing,and the flexible net’s numerical model was calibrated based on these results.3D scanning technology was used to create scaled grid models of typical rock burst blocks.A numerical model of tunnel arch protection was established,and simulations were performed with different block shapes and impact energies.The results showed that:(1)The deformation of the flexible net is primarily influenced by the contact area between the burst block and the net surface,as well as the mass of the burst block;(2)At maximum displacement,the three anchor bolts closest to theimpact point experience the highest tensile forces,while the strips and nodes near these bolts experience the greatest tensile and peeling forces,respectively;(3)The forces on the strips and nodes are related to the energy,shape,and impact position of the burst block,while the forces on the anchor bolts are mainly determined by the impact energy.These findings provide valuable theoretical support for the application of flexible protective systems in rock burst prevention.
作者
宋选
杨为民
张恩铭
王美霞
张志远
孙浩程
SONG Xuan;YANG Weimin;ZHANG Enming;WANG Meixia;ZHANG Zhiyuan;SUN Haocheng(School of Qilu Transportation,Shandong University,Jinan 250003,China;Institute of Geotechnical and Underground Engineering,Shandong University,Jinan 250061,China;Hock Technology Co.Ltd.,Jining 272104,China)
出处
《应用基础与工程科学学报》
北大核心
2025年第3期890-902,共13页
Journal of Basic Science and Engineering
基金
山东省自然科学基金项目(SDCX-ZG-202303011)
国家自然科学基金项目(42477156)。
关键词
岩爆
冲击荷载
爆块
柔性防护网
数值模拟
力学特性
动力响应
rockburst
impact load
rockburst fragments
flexible protection net
numerical simulation
mechanical properties
dynamic response
