摘要
为能设计出新型抗爆锚杆,提高锚固洞室的抗爆能力,利用相似模型试验和数值分析方法,研究锚杆在顶爆作用下的轴力分布规律。通过相似模型试验,发现拱顶锚杆先受压后受拉,锚杆受压峰值和受拉峰值从锚端到锚头先增加后减小,最大受压峰值靠近锚端,而最大受拉峰值靠近锚头。采用数值分析得到:3种模型拱顶锚杆所受压力除了锚端和锚头附近比较小外,其他部位的压力相差比较小;从锚端至锚头拱顶锚杆拉力先增加后减小,最大拉力为靠近锚头,其他部位的锚杆从锚端至锚头变化比较小,并其值明显小于拱顶锚杆。
In order to design new rock bolts improving explosion resisting capacity of tunnels reinforced by rock bolts,the axial force distribution under top explosion was studied by the model test and numerical analysis. Based on the model test,rock bolts of vault bore pressure and tension,according to axial stress distribution along the bolts on vault,the peak tension and peak pressure increased firstly,and then decreased,and the maximal peak pressure was near to anchorage,while the maximal peak tension was near to anchor head. According to numerical analysis,at the same time,the pressure had no difference significantly except that the pressure of anchorage and anchor head was small. The tension of three bolts on vault from anchorage to anchor top increased firstly,and then decreased,and the maximal peak tension was near to anchor top. The pressure and tension of other bolts also had no difference significantly,whose strength was smaller than that of vault.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2014年第A02期3919-3923,共5页
Chinese Journal of Rock Mechanics and Engineering
基金
河南省科技攻关项目(142102210433)
河南省教育厅科学技术研究重点项目科技攻关计划(14A440003)
关键词
数值分析
地下工程
顶爆
锚杆
洞室
轴力
numerical analysis
underground engineering
top explosion
rock bolts
tunnels
axial force
