摘要
为了探究锚固支护中全长粘结式和预应力式两种常用的锚杆类型发挥的锚固效果差异,该文结合工程实际,采用数值分析软件开展了隧道开挖支护过程中围岩变形、应力分布特征以及塑性区变化规律的研究。结果表明:预应力锚杆相较于全长粘结式锚杆,可减小20%的围岩变形量;在改善围岩应力状态方面有10%左右的提升,最终对围岩开挖后的塑性区发展可起到有效控制作用。
Full-length bond bolt is suitable for soft rock tunnel with large deformation, and the deformation of surrounding rock can be limited after excavation.However, it can only play a passive protective role because of the disharmony of deformation between the two, and this deficiency can be effectively overcome by applying prestress.In order to explore the difference of anchoring effect between full-length bond type and prestressed type, combined with engineering practice, numerical analysis software was used to study the deformation, stress distribution characteristics and plastic zone variation of surrounding rock during tunnel excavation and support.The results show that the prestressed bolt can reduce the deformation of surrounding rock by 20% compared with the full-length bond bolt.It can improve the stress state of surrounding rock by about 10%, which can effectively control the development of plastic zone after excavation of surrounding rock.
作者
张忠义
ZHANG Zhongyi(China Railway Eleventh Bureau Group Fourth Engineering Company Limited,Wuhan 100855,China)
出处
《广东水利水电》
2023年第2期75-79,共5页
Guangdong Water Resources and Hydropower
关键词
软弱围岩
支护效果
全长粘结锚杆
预应力锚杆
soft surrounding rock
supporting effect
full-length bond bolt
prestressed bolt
