SHEET PILE WALLS การออกแบบ SHEET PILE
Cantilever sheetpiling walls depend on the passive resisting capacity of the soil below the depth of excavation to prevent overturning. The depth of sheetpiling walls below the bottom of the excavation are determined by using the difference between the passive and active pressures acting on the wall. The theoretical depth of pile penetration below the depth of excavation is obtained by equating horizontal forces and by taking moments about an assumed bottom of piling. The theoretical depth of penetration represents the point of rotation of the piling. Additional penetration is needed to obtain some fixity for the piling. Computed piling depths are generally increased 20% to 40% to obtain some fixity and to prevent lateral movement at the bottom of the piling.