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 affected the yielding
pipe’s displacement-load relations. As the eccentric load increased, the
yielding point and its corresponding displacement increased linearly while
the yielding amount decreased linearly; (3) The eccentric load could be
adjusted to control the yielding point and amount in order to meet the
roadway support’s requirement for the yielding bolt.