摘要
针对预应力锚杆作用机制研究方面存在的问题,根据弹性理论轴对称问题的基本理论和方法,在引入锚杆影响范围内岩体平均轴向应力(平均轴向应变)假设的条件下,推导锚杆在完全黏结条件下界面剪应力分布公式;以此为基础,在考虑界面本构关系情况下,研究界面脱黏段的剪应力分布及脱黏段长度,阐述预应力锚杆的荷载传递特性,从而为预应力锚杆设计提供理论依据。
Prestressed rock bolts have been widely used for rock reinforcement in slope engineering. Bolts reinforce rock masses through restraining the deformation within the rock masses. In order to improve bolting design, it is necessary to have a good understanding of behavior of prestressed rock bolts in slope engineering. An analytical model is proposed to predict the shear distribution of prestressed grouted rock bolt. The interaction mechanism of rock bolt and around rock mass has been described according the axisymmetric elastic problem and constitution law of interface of rock bolt and rock mass. Coupling and uncoupling behaviors of interface have been analyzed. According to case studies, the theoretical results show that the shear distribution is related to properties of rock mass, rock bolt and grouted materials; and the region that exist shear stress is very short. The conclusions can be used for prestressed rock bolt design.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2006年第9期1876-1880,共5页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(40572158)
组合抗滑结构作用机制研究项目(Y10059)
关键词
基础工程
轴对称问题
预应力锚杆
作用机制
foundation engineering
axisymmetric problem
prestressed anchor bolt
interaction mechanism
