The Influence Law of Eccentric Load on the Performance of Yielding Bolt

In order to adapt high stress and large deformation of roadways, the prestressed yielding bolt has been developed. However, borehole deviation makes the boreholes out of perpendicular to the roadway surface, and the prestressed yielding bolt will be under eccentric load. In order to reveal the influence laws of eccentric load on the performance of the prestressed yielding bolt, the numerical simulation was carried out in this paper. Then, the influence of eccentric load on displacement-load relations, use efficiency for the yielding pipe material, plastic strains of the bolt components, as well as the absorptive capacity of the yielding pipe, were analyzed. The results are as follows: (1). Eccentric loads affected use efficiency of the yielding pipe material, plastic strains of bolt components and the absorptive capacity to a certain degree at the stage of initial displacement, while these impacts could be neglected at the stage of the later displacement; (2) Eccentric load mainly affec...

为应对巷道高应力与大变形问题，预应力让压锚杆（prestressed yielding bolt）应运而生。然而钻孔偏斜会导致钻孔无法与巷道壁面保持垂直，使得预应力让压锚杆承受偏心荷载。为揭示偏心荷载对预应力让压锚杆力学性能的影响规律，本文开展了数值模拟研究。随后分析了偏心荷载对位移-荷载关系、让压管材料利用率、锚杆构件塑性应变以及让压管吸能能力的影响。研究结果如下：(1) 在位移初始阶段，偏心荷载对让压管材料利用率、锚杆构件塑性应变及吸能能力存在一定程度的影响，但在位移后期阶段，此类影响可忽略不计；(2) 偏心荷载主要影