Study on The Ultimate Bearing Capacity of Cross Foundation under Horizontal Loading Mode

Abstract

The cross foundation as a special form of the overhead transmission line tower foundation, which has a buried depth, high reliability, good integrity, resistance to horizontal displacement ability characteristics. Research the ultimate bearing capacity of the foundation that based on the limit equilibrium principle in the M-C constitutive model under the condition of horizontal load. The process of deformation, development and damage of foundation after loading is simulated, the influence of friction angle and cohesive force on the bearing capacity of the foundation is analyzed, and drawn the P-S curve. According to the theoretical formula of the ultimate bearing capacity of Hansen and the numerical simulation results, analyzed the reason of the difference and proposed the concept of the correction factor. The results show that the numerical simulation results well reflect the whole process of foundation deformation and failure, the effect of friction angle and cohesion on the bearing capacity of foundation is visual. The Hansen theoretical formula is too conservative to a certain extent, the modified formula of ultimate bearing capacity is proposed, which provides a reference for the application of cross foundation in transmission line engineering.