The spatial effect of earth pressure is considered; and the deformation compatibility of space that the cap beam applies to the double-row piles support structure is analyzed. Besides
the affection on the earth pressure of both the front and the back row piles due to sliding plane and array pitch is considered too. Based on the beam on elastic foundation method
a new calculation model for a double-row piles retaining structure is proposed. Comparing the calculation results of the theoretical model with the actual observation data
it is shown that the effective calculation result can be obtained by reasonable parameters applied to the model.