The assumptions of the Polyline slope is inconsistent with the classical soil pressure theory due to the difference in the shape of the fill surface

and cannot be directly solved by classical earth pressure theory. Based on the static balance principle of the wedge behind the retaining wall

the mechanical model of the pressure analysis of the wedge behind the wall was established

and the functional expression of the total lateral pressure on the rupture angle was obtained. By calculating its extremum

the fracture angle and active earth pressure of backfill soil in active limit equilibrium state are obtained. The calculation formula of the active earth pressure of the local horizontal slope of the top of slope surface and the local horizontal slope of the top of slope surface was obtained respectively. Compared with the current standard method

the proposed method in this paper overcomes the limitation of calculating the active earth pressure of slope retaining wall without considering the friction between the wall and soil. The earth pressure and the overturning moment are smaller than the calculation results of the standard method

which is consistent with the calculation results of the graphic method and avoids the tedious drawing work of the graphic method. Aiming at the local sloping slope of the slope top surface which occurs in actual engineering

in this paper

the conversion coefficient of reducing the local inclined soil layer on the slope top surface to the uniform distribution load is proposed

which simplifies the calculation method of earth pressure.