Stability of retaining wall on subsidence soils

Abstract

The paper presents the results of survey and calculation of stability of retaining walls along motorways located at the slope of the slope. The results of numerical solution in modelling of slope and retaining wall interaction are analyzed, showing that the most dangerous are the zones of development of maximum horizontal deformations at retaining walls caused by shear deformations. The shear deformation propagation zone covers a large volume of slope soils. Subsidence soils, subsiding from their own weight on the slope under water saturation, deteriorate the initial value of cohesion, angle of internal friction, modulus of deformation, changing the stress-strain state. The trajectories of movement of subsidence soil particles during the change of stress-strain state of the slope on the retaining wall show that the movement of soil particles occurs at the boundary of subsidence and non-subsidence loams. Numerical calculations using PLAXIS programme showed that in water-saturated state, the slope is landslide-prone. The retaining wall on the slope of the slope, composed of subsidence soils, is not stable and soil sliding occurs only in the layers of subsidence soils of the slope.