Numerical study on deformation of diaphragm cut off walls under seepage forces in permeable soils

Numerical modelling using Plaxis-2D is carried out to study seepage forces on suspended type cutoff walls in highly permeable soils. On increasing differential pressure head, deformation and bending moment in cutoff walls increased. On increasing the differential pressure, the point of occurrence of maximum deformation and maximum Bending Moment in downstream cutoff wall shifts upwards but in upstream cutoff wall, shifts downward. On increasing relative density and soil modulus, the deformation and bending moments reduced. For changes in pressure head, relative density and soil modulus, the deformation and bending moment are always higher in downstream cutoff wall than upstream wall.