When the situation that the anchor is over the planning red line is restricted

the double-row piles supporting for excavation has been widely used. The practice shows that the calculation model of double-row piles in current specifications is simple and convenient

but for the soft soil excavation the calculation results of displacements are not well reasonable. Meanwhile the same time

the soil between piles is simplified as compression springs and the effect of pile and soil column is not fully considered

which makes the calculation results of displacement larger. In order to improve these deficiencies

a new earth pressure model is proposed that the additional pressure under the foundation pit is regarded as elastic stress

the equivalent soil column stiffness is added to strengthen the pile-soil interaction

the larger value of spring stiffness under the foundation pit between compression stiffness and stiffness of “m” method is chose

which is to make the calculating displacements more reasonable. At last it is compared to the results of the finite element method and the engineering tests

and its rationality is preliminary verified.