What are the two methods that are used to determine the capacity developed along the length of the pile shaft?
What are the two methods that are used to determine the capacity developed along the length of the pile shaft?
Pile load capacity depends on a number of factors including cross section, pile length and shape characteristics; pile installation method; and short and long term soil properties and soil configuration; .
The two methods that are used to determine the capacity developed along the length of the pile shaft are as follows:
- α – method
- β – method
- α – method: This method is used to measure the short-term load capacity (total stress) of piles in cohesive soils.
The method is based on the undrained shear cohesive soil strength; therefore, it is good for calculations of short-term load capacity of the piles. This method assumes the skin friction is proportional to the undrained shear strength of the cohesive soil and the ultimate skin friction is generally assumed to be independent of the depth and effective stress. The interface shear stress between the surrounding soil and the pile surface is determined as follows.
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