摘要
利用动态数值模拟软件,研究了锚固硐室在顶爆作用下的裂纹分布,并对裂纹产生机理进行了分析。通过应力波的传播过程和与模型试验裂纹分布对比,得出数值模拟的结果比较可靠。随着爆炸应力波的传播,主要在地表和硐室表面由于反射拉伸产生"层裂",以及在锚杆之间和拱脚侧面产生大量裂纹。通过对比毛硐和锚固硐室裂纹分布,发现毛硐的裂纹明显比锚固硐室分布广、粗,这说明锚杆的抗爆效果比较好。
Distribution of cracks and its mechanism of the tunnel reinforced by bolts were studied by numerical analysis.It is proved that numerical results are reliable by comparing the law of stress wave propagation and distribution of cracks.With stress wave propagation,cracks produced by stress waves were formed in free surface of top and tunnel,and some cracks were distributed in two sides of arch foots and between bolts.Comparing cracks of the tunnel with no support and the tunnel reinforced by bolts,the cracks of the tunnel with no support are wider and thicker than anchored tunnel.As a result,it shows that the anchored effect is very good.
出处
《采矿与安全工程学报》
EI
北大核心
2012年第2期245-249,共5页
Journal of Mining & Safety Engineering
基金
河南省教育厅自然科学基金项目(2011A580003)
河南理工大学博士基金项目(B2010-58)
关键词
岩石力学
隧道工程
锚固硐室
动态裂纹
数值分析
rock mechanics
tunnel projects
tunnels reinforced by bolts
dynamic cracks
numerical analysis
