Research on the Composite Foundation Anti-deformation Performance and Optimal Thickness of Electricity Transmission Towers in Mining Subsidence Area

In this paper,the finite element models are established for typical kinds of electricity transmission tower.The anti-deformation performances of single foundation and composite foundation with different thickness protection plate are studied with numerical simulation.The study indicates that,compared to the single foundation,the horizontal displacements of supports and the stresses of the upper structure are distinctly decreased by the composite foundation.The study also indicates that,the improvement of anti-deformation performance by increasing thickness of protection plate played an important role only in a limited range,the feasible minimum thickness of the plate is about 1/45-1/35 of the distance between two supports.As a result,the study lends a support to the improvement of the foundation design method for the transmission tower in the subsidence area.