In recent years

the double-row piles were widely used in deep foundation pit.But selecting of double-row piles form

spacing of front and back row piles

controlling of pile vertex displacement and designing of the size of the crown beam were still the difficulties in design.Combined with an actual foundation pit engineering in hefei

a three-dimensional model of retaining structure with double-row piles was established by using finite element software ABAQUS.Through finite element analysis

the influence of excavation depth

row spacing and structure form on double-row piles stress and deformation were studied.FEM analysis results were close to the measured results

the measured displacement met the relevant requirements

and marked supporting effect of double-row piles has been proved.