Based on a large number of measured data for a deep excavation in-situ

the corresponding bending moments

deformation characteristics and the earth pressure distribution of a double-row piles retaining structure are studied. Some problems are analyzed

including the space effect of deep excavation

the effect of cap beam on earth pressure

the relationship between retaining structure deformation and the earth pressure distribution

and the mechanism of action between retaining structure and soil. The studies show that the earth pressure distributions on the double-row piles retaining structure are quite complicated

and are different from those obtained by the classical Rankine’s or Coulomb’s earth pressure theory

which supply a basis for the design model of double-row piles retaining structure.