弹性状态下全长黏结型纤维筋锚杆锚固性能的能量算法

An energy arithmetic of anchoring behavior of full-length bonding fiber reinforced plastic bolts under elastic state

纤维增强塑料筋锚杆通过全长黏结的方式应用于隧道、矿山巷道的支护,具有广阔前景。从能量角度出发,考虑锚固段剪切-滑移刚度沿轴向的变化,结合受力平衡方程和变形协调方程,在最小势能和边界条件的约束下,通过离散迭代求解弹性状态下全长黏结型纤维筋锚杆在不同荷载、不同长度下轴向应力、侧阻力和相对滑移的分布演化规律,并探讨开挖面空间效应的影响。所得理论计算结果与实际工程所测得的规律和趋势相符,可为全长黏结型纤维增强塑料筋锚杆锚固系统的分析和设计提供参考和借鉴。

The fiber reinforced plastic bolts used in supporting of tunnel and underground engineering with full-length bonding is very widely. From the viewpoint of energy, the shear slip stiffness variation along the axial direction is considered, combining with the force equilibrium and deformation coordination equation and constraint conditions of minimum potential energy and boundary conditions, the distribution and evolution rule of axial stress, friction and relatively slip of anchorage body with different loading and length under elastic state have been solved based on discrete iterative. The influence of spatial effect of excavation face has been discussed. The theoretical calculation results correspond to the field monitoring results. It can provide theoretical references for the anchor system analysis and design of fiber reinforced plastic bolts.