Aiming at the pile foundation of transmission lines in mountainous area

the relationship between the bearing capacity of pile foundation and the factors of topographic slope

geology and lithology

width of design virtual slope in slope terrain are studied by using FLAC3D. Numerical analysis results indicate that

the larger the topographic slope

the worse the geological lithology and the smaller the width of virtual slope

the smaller the safety factor of the bearing capacity of slope foundation. Through the example analysis of typical suspension towers and tension towers of a ±800 kV UHVDC project

the equivalent m value of typical rock foundation is proposed. With the introduction of reduction factor μ for m value method

the adverse effects of topographic slope and different angle of tension tower on the horizontal bearing capacity of pile foundation are also considered

which is provided to designers for reference.