爆炸作用下锚固洞室的振动速度分布规律及锚杆参数的影响  

Distribution of vibration velocity and influence of bolt parameters of caverns reinforced by rock bolts under blast loads

作　　者：王光勇 王涛涛[1] 裴晨浩 Wang Guangyong;Wang Taotao;Pei Chenhao(Huanghe Jiaotong University,454950,Jiaozuo,China;School of Civil Engineering,Henan Polytechnic University,454000,Jiaozuo,China)

机构地区：[1]黄河交通学院,焦作454950 [2]河南理工大学土木工程学院,焦作454000

出　　处：《应用力学学报》2020年第5期2207-2213,I0026,共8页Chinese Journal of Applied Mechanics

基　　金：国家自然基金(51778215);河南省科技厅2018年科技发展计划科技攻关项目(182102310800);焦作市科技局二○一七年科技计划项目(焦科[2017]96)。

摘　　要：基于模型实验,利用数值分析方法研究了爆炸作用下锚固洞室的振动速度分布规律,探讨了锚杆间距与长度对振动速度的影响。结果表明:在顶爆作用下,锚杆加固前后地下洞室拱顶、拱脚、侧墙、拱底振动速度峰值依次减小,锚杆能够起到减小振动速度的效果;集中装药爆炸后应力波以球形向四周传播,在应力波与地下洞室作用之前,振动速度的方向沿着径向由外向内,质点振动速度先增加后减小;当应力波与地下锚固洞室相互作用后,振动速度在地下锚固洞室自由面以及锚固区与非锚固区之间发生放大效应,并且改变了锚固洞室洞壁振动速度的方向;在顶爆作用下,随着锚杆长度的增加,相同间距地下锚固洞室洞壁拱顶振动速度峰值逐渐增大,拱脚和侧墙振动速度峰值逐渐减小,拱底振动速度峰值变化较小。Based on the model tests, distribution of vibration velocity of caverns reinforced by rockbolts is studied by numerical analysis, and the influences of bolt spacing and length on the vibration velocity are discussed. Under the action of top explosion, the peak vibration velocities of vault, arch foot, side wall and arch bottom of reinforced cavern and unreinforced cavern reduce successively, and the bolts can reduce the vibration velocity. After the explosion of concentrated charge, the vibration velocity spread around the sphere, and before the stress wave interacts with the underground cavern, the vibration velocity of the particles increases first and then decreases along the radial direction from the outside to the inside. When the stress wave interacts with the underground anchoring cavern, the vibration velocity will amplify between the free surface of the underground anchoring cavern and the anchoring zone and the non-anchoring zone, and change the direction of the vibration velocity of the anchoring cavern wall. Under the action of top explosion, with the increase of the length of the bolt, the peak velocity of the vault of the underground anchorage cavern of the same distance is getting larger and larger, and the peak velocity of the arch and side wall is getting smaller and smaller, and the change of vibration velocity of the arch bottom is small.

关 键 词：防护工程 爆炸荷载 锚固洞室 锚杆参数 振动速度 数值分析 

分 类 号：TU457[建筑科学—岩土工程]