Double-row Pile Wall
The program allows us to model the double-row pile wall in the "Geometry" frame.
The structure consists of three parts:
- front row
- back row
- connecting beam
The cross-section is selected for each part separately. The connection of the front and back row with a connecting beam is considered as rigid and the wall forms a portal frame.
The influence of normal force is considered for dimensioning of cross-section.
Calculation model - 1) front row, 2) back row, 3) connecting beam
The structure is loaded by three main loads:
- earth pressure behind the back row
- earth pressure in front of the front row
- earth pressure between the front and back row
The earth pressure acting on the front and back row is calculated in the same way as in the case of a standard wall.
The pressure between the front and back row is determined according to:
Where: | pc | - | resultant pressure |
kc | - | stiffness coefficient of soil between the front and back row | |
Δv | - | difference of deformation of the front and back row | |
pc,0 | - | initial earth pressure acting between the front and back row |
The soil stiffness coefficient is calculated as follows:
Where: | Eoed | - | |
sy | - | distance between the front and back row | |
d | - | diameter or height of the corss-section |
The initial earth pressure between the front and back row is determined by the following formula:
Where: | α | - | calculation coefficient; if α > 1 then α = 1 |
pa | - | ||
sy | - | distance between the front and back row | |
d | - | diameter or height of the corss-section | |
h | - | final excavation depth | |
φm | - | average value of the angle of internal friction |