The Impact of the Angle Between the Soft-Hard Interlayer Rock Mass and the End Anchorage of Bolts on the Support Stress Field
DOI:
https://doi.org/10.54097/a811kb86Keywords:
End Anchorage, Stratified Rock Mass, Support Stress Field, Similarity Simulation, Numerical Simulation.Abstract
To investigate the impact of the angle between the soft-hard interlayer rock mass and the end-anchored bolts on the support stress field, numerical simulations were conducted to create models of soft-hard interlayer rock masses with varying dip angles. The distribution of the support stress field was analyzed. The results show that the variation in the angle between the soft-hard interlayer rock layers and the end-anchored bolts significantly affects the support stress field at the anchorage. In all models, the anchorage section is under tension, while the areas below the anchorage and above the bearing plate are under compression. In the single-bolt support model, when the angle between the rock layers and the bolt is small, the stress field is uniformly symmetrical, with a larger compression stress area and a symmetrical tension stress area. As the dip angle increases, the stress field gradually develops into an asymmetric distribution, with the compression stress area shifting and the tension stress area becoming asymmetric. The compression stress in the soft rock layers is lower than that in the hard rock layers. In the double-bolt support model, the overlapping stress field gradually transitions from a uniform symmetrical distribution to an asymmetric one as the dip angle increases. The internal stress values gradually decrease, and the actual support effectiveness weakens. It is evident that the angle between the soft-hard interlayer rock mass and the end-anchored bolts has a significant impact on the support stress field. The findings of this study provide useful insights for the design and construction of bolt support systems, including the spacing between bolts, in engineering practice.
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