Study on non-limit active earth pressure of finite soil under T mode

Under the T (translation) mode, the active earth pressure of the limit soil is closely related to the displacement of the retaining wall and the width of the backfill of the wall. Based on the plane sliding assumption, fully considering the influence of the width of the backfill wall and the displacement of the wall on the internal and external friction angles, a balance equation is established, and the different backfill widths of the wall under any translational displacement are derived Formula of active earth pressure. The analysis shows that the fracture angle of the soil decreases with the increase of the soil width, decreases with the increase of the displacement or decreases first and then increases; the size of the active earth pressure of the limited soil decreases with the increase of the displacement; its soil Whether the pressure distribution intersects with the Coulomb earth pressure distribution depends on the width-to-height ratio of the fill. The intersection point gradually transitions from the bottom of the wall to the top of the wall as the ratio of displacement to the limit displacement increases, only when the width-to-height ratio is not less than 0.5 and the displacement reaches the limit. The solution in this paper is approximately equal to the Coulomb solution.