Abstract
When designing a pile on the steep slope, the calculation is based on a hypothesis of horizontal ground. Obviously, it is difficult to estimate the difference between the calculation result and the actual loading behaviour of the pile foundation. For a UHV (Ultra High Voltage) power transmission project in China, results are compared by two kinds of methods. One is traditional theory; the other is numerical simulation method. It shows that quite different deformation of ground foundation occurs near two sides of the pile cap. The traditional calculating method for the pile foundation can consider the effect by increasing the part of the pile above the ground surface. Reasonability of the increased value can be assessed by the numerical method. The result of numerical simulation shows that the maximum deformation appears in the middle of the pile, but it occurs in the top of the pile by the traditional method. And deformation is evidently larger by the traditional method. Deformation curve is different between the traditional method and the numerical method which can consider frictional resistance around the pile. Quite different are vertical stress values of the pile obtained by two methods.
Highlights
With the implementation of Chinese "West-East electricity transmission project", "UHV (Ultra High Voltage) power transmission" and other significant energy strategies, the technology of ± 800kV HVDC power transmission has been widely used for the output of hydropower from the Jinsha River and Yalong River
In view of the horizontal displacement of the pile, at the depth of 6m from the pile top, in two cases the result of the pile axis by numerical simulation is close to that of standard values of loads by theoretical calculation according to the code
The value increased is suggested by a formulation of (2.5~3.0)hDhtanαin which D is the diameter of the pile, and α is the dip angle of the steep slope
Summary
With the implementation of Chinese "West-East electricity transmission project", "UHV (Ultra High Voltage) power transmission" and other significant energy strategies, the technology of ± 800kV HVDC power transmission has been widely used for the output of hydropower from the Jinsha River and Yalong River. With the construction of highways, hydro projects, and UHV power transmission projects in China, it have made some researches about design methods for pile foundation on slope and the interaction between pile and soil. Based on the available achievements, theoretical analysis and numerical calculation are both conducted for a pile foundation on steep slope in a Chinese UHV power transmission project. It shows distinctly the loading behaviour of pile foundation on steep slope either pulling up or pressing down, which can offer data support for designing the pile foundation on steep slope in transmission projects
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