Study on Stress Characteristics and Control Factors of Inclined Anchor Short Column

In southwest mountainous area of China, there are a large number of composite strata with thin covering layer, good engineering properties of overlying bedrock but difficult excavation, and the mountainous terrain is steep and complicated, which is not conducive to transmission tower infrastructure construction. To solve this problem, a short-pile foundation with inclined anchor is taken as transmission tower foundation, whose can make full use of the bearing capacity of the bedrock while reducing the excavation depth and construction difficulty. In order to explore the mechanical characteristics and main control factors of short pile foundation with inclined anchor, a numerical model was established by FLAC^3D, and the effects of anchor bar diameter and bolt angle on the tensile bearing characteristics of short pile foundation with inclined anchor were discussed. The results show that when the load is large, the bearing ratio of the anchor rod structure increases obviously with the increase of the diameter of the anchor bar, but if the diameter of the anchor bar is too large, the bearing ratio of the anchor rod has less room for lifting. As the bolt Angle decreases, the uplift bearing capacity of short pile foundation with inclined anchor increases under pure uplift load, but its resistance to horizontal load weakens. Considering comprehensively, In the siltstone stratum, anchor bar diameter 40mm and bolt Angle 25° are the optimal design parameters of short pile foundation with inclined anchor.