Finite Element Modeling of the Bearing Capacity for Transmission Tower Foundations on Expansive Soil
To satisfy the increasing power demands, lots of transmission lines are constructed in the middle-west of China. Expansive soil widely distributes in these areas, and the safety of foundation for transmission line tower needs to be evaluated. Based on consolidated drained triaxial tests, the cohesion and internal friction angle of unsaturated expansive soil were obtained. The compressive and uplift bearing capacities of the plate foundation for transmission line tower foundation were analyzed by 3D finite element modeling. The failure mode of the plate foundation under compressive load shows a local shear mode. For the uplift bearing capacity, the failure mode shows an annular apophysis mode around the plate foundation at the surface. The influence of the saturation of soil on the bearing capacity is more obvious than the uplift bearing capacity of a plate foundation.
KeywordsExpansive soil Shear strength Transmission line tower Bearing capacity Numerical simulation
The work was financially supported by the State Grid Corporation of China (through Grant No. 5217L0160001) and the Fundamental Research Funds for the Central Universities, these support are gratefully acknowledged.
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